Suprakash Datta. Office: LAS 3043 Phone: ext Course page:

Size: px
Start display at page:

Download "Suprakash Datta. Office: LAS 3043 Phone: ext Course page:"

Transcription

1 CSE 3214: Computer Network Protocols and Applications Suprakash Datta Office: LAS 3043 Phone: ext Course page: These slides are adapted from Jim Kurose s slides. CSE S.Datta 1

2 Administrivia Course webpage: Textbook: Lectures: Tue-Thu 10:00-11:30 pm (PSE 321) Exams: midterm (30%), final (40%) omework (30%): Assignments. Slides: should be available the morning of the class Office hours: Tuesday, Thu: 12:30-2:30 pm or by appointment at LAS 3043 Computer Networking: A Top Down Approach Featuring the Inter, 6th edition. Jim Kurose, Keith Ross; Pearson. CSE S.Datta 2

3 Administrivia contd. Cheating will not be tolerated. Visit the webpage for more details on policies etc. Be careful not to misuse packet sniffing software. I would like to have a 2-hour midterm. Your cooperation is greatly appreciated. TA: F. Yasmeen CSE S.Datta 3

4 Course objectives Understand the full TCP/IP architecture. Become familiar with advanced topics - P2P systems, multimedia communication (including VoIP), work security, wireless sensor works. Learn about active research areas. CSE S.Datta 4

5 Major differences with 3213 Top-down approach. More algorithmic (less math!) More hands-on TCP/IP programming. CSE S.Datta 5

6 What is the Inter? Chapter 1: Introduction Network of works eterogeneous Distributed Owned by many different entities Allows easy additions and removal from the work CSE S.Datta 6

7 The Inter: nuts and bolts view millions of connected computing devices: hosts = end systems running work apps communication links fiber, copper, radio, satellite transmission rate = bandwidth routers: forward packets (chunks of data) router server local ISP workstation mobile regional ISP company work CSE S.Datta 7

8 The Inter: nuts and bolts view PC server wireless laptop smartphone v millions of connected computing devices: hosts = end systems running work apps mobile work global ISP wireless links wired links v communication links fiber, copper, radio, satellite transmission rate: bandwidth home work regional ISP router v Packet switches: forward packets (chunks of data) routers and switches institutional work Introduction 1-8

9 The Inter: nuts and bolts view protocols control sending, receiving of msgs e.g., TCP, IP, TTP, FTP, PPP Inter: work of works loosely hierarchical public Inter versus private intra Inter standards RFC: Request for comments IETF: Inter Engineering Task Force mobile work home work global ISP regional ISP protocols define format, order of msgs sent and received among work entities, and actions taken on msg transmission, receipt institutional work CSE S.Datta 9

10 The Inter: a service view communication infrastructure enables distributed applications: Web, , games, e- commerce, file sharing communication services provided to apps: Connectionless unreliable Connection-oriented reliable CSE S.Datta 10

11 What s a protocol? human protocols: v what s the time? v I have a question v introductions specific msgs sent specific actions taken when msgs received, or other events work protocols: v machines rather than humans v all communication activity in Inter governed by protocols protocols define format, order of msgs sent and received among work entities, and actions taken on msg transmission, receipt Introduction 1-11

12 What s a protocol? a human protocol and a computer work protocol: i i Got the time? 2:00 time TCP connection request TCP connection response Get <file> Introduction 1-12

13 Access works and physical media Q: ow to connect end systems to edge router? v v v residential s institutional works (school, company) mobile works keep in mind: v bandwidth (bits per second) of work? shared or dedicated? v Introduction 1-13

14 Access : digital subscriber line (DSL) central office telephone work DSL modem splitter DSLAM voice, data transmitted at different frequencies over dedicated line to central office use existing telephone line to central office DSLAM over DSL phone line goes to Inter voice over DSL phone line goes to telephone v < 2.5 Mbps upstream transmission rate (typically < 1 Mbps) v < 24 Mbps downstream transmission rate (typically < 10 Mbps) DSL multiplexer ISP Introduction 1-14

15 Access : cable work cable headend cable modem splitter V I D E O V I D E O V I D E O V I D E O V I D E O V I D E O D A T A D A T A C O N T R O L Channels frequency division multiplexing: different channels transmitted in different frequency bands Introduction 1-15

16 Access : cable work cable headend cable modem splitter data, TV transmitted at different frequencies over shared cable distribution work CMTS ISP cable modem termination system v FC: hybrid fiber coax asymmetric: up to 30Mbps downstream transmission rate, 2 Mbps upstream transmission rate v work of cable, fiber attaches homes to ISP router homes share work to cable headend unlike DSL: DSL has dedicated to central office Introduction 1-16

17 Access : home work wireless devices often combined in single box to/from headend or central office cable or DSL modem wireless point (54 Mbps) router, firewall, NAT wired Ether (100 Mbps) Introduction 1-17

18 Enterprise works (Ether) institutional link to ISP (Inter) institutional router Ether switch institutional mail, web servers v v v typically used in companies, universities, etc 10 Mbps, 100Mbps, 1Gbps, 10Gbps transmission rates today, end systems typically connect into Ether switch Introduction 1-18

19 A closer look at work structure work edge: applications and hosts work core: interconnected routers work of works works, physical media: wired, wireless communication links CSE S.Datta 19

20 Wireless works v shared wireless work connects end system to router via base station aka point wireless LANs: within building (100 ft) b/g (WiFi): 11, 54 Mbps transmission rate wide-area wireless provided by telco (cellular) operator, 10 s km between 1 and 10 Mbps 3G, 4G: LTE to Inter to Inter Introduction 1-20

21 ost: sends packets of data host sending function: vtakes application message vbreaks into smaller chunks, known as packets, of length L bits vtransmits packet into work at transmission rate R link transmission rate, aka link capacity, aka link bandwidth host 2 1 two packets, L bits each R: link transmission rate packet transmission delay time needed to transmit L-bit packet into link = = L (bits) R (bits/sec) Introduction 1-21

22 Physical media v bit: propagates between transmitter/receiver pairs v physical link: what lies between transmitter & receiver v guided media: signals propagate in solid media: copper, fiber, coax v unguided media: signals propagate freely, e.g., radio twisted pair (TP) v two insulated copper wires Category 5: 100 Mbps, 1 Gpbs Ether Category 6: 10Gbps Introduction 1-22

23 Physical media: coax, fiber coaxial cable: v two concentric copper conductors v bidirectional v broadband: multiple channels on cable FC fiber optic cable: v glass fiber carrying light pulses, each pulse a bit v high-speed operation: high-speed point-to-point transmission (e.g., 10 s-100 s Gpbs transmission rate) v low error rate: repeaters spaced far apart immune to electromagic noise Introduction 1-23

24 Physical media: radio v signal carried in electromagic spectrum v no physical wire v bidirectional v propagation environment effects: reflection obstruction by objects interference radio link types: v terrestrial microwave e.g. up to 45 Mbps channels v LAN (e.g., WiFi) 11Mbps, 54 Mbps v wide-area (e.g., cellular) 3G cellular: ~ few Mbps v satellite Kbps to 45Mbps channel (or multiple smaller channels) 270 msec end-end delay geosynchronous versus low altitude Introduction 1-24

25 The work edge end systems (hosts): run application programs e.g. Web, at edge of work client/server model client host requests, receives service from always-on server e.g. Web browser/server; client/server peer-peer model: minimal (or no) use of dedicated servers e.g. Gnutella, KaZaA CSE S.Datta 25

26 Network edge: connection-oriented service Goal: data transfer between end systems handshaking: setup (prepare for) data transfer ahead of time ello, hello back human protocol set up state in two communicating hosts TCP - Transmission Control Protocol Inter s connectionoriented service TCP service [RFC 793] reliable, in-order bytestream data transfer loss: acknowledgements and retransmissions flow control: sender won t overwhelm receiver congestion control: Connection-oriented service not the same as that in traditional telephony. senders slow down sending rate when work congested CSE S.Datta 26

27 Network edge: connectionless service Goal: data transfer between end systems same as before! UDP - User Datagram Protocol [RFC 768]: connectionless unreliable data transfer no flow control no congestion control App s using TCP: TTP (Web), FTP (file transfer), Tel (remote login), SMTP ( ) App s using UDP: streaming media, teleconferencing, DNS, Inter telephony CSE S.Datta 27

28 The work core v mesh of interconnected routers v packet-switching: hosts break application-layer messages into packets forward packets from one router to the next, across links on path from source to destination each packet transmitted at full link capacity Introduction 1-28

29 Packet-switching: store-and-forward L bits per packet source R bps R bps destination v takes L/R seconds to transmit (push out) L-bit packet into link at R bps v store and forward: entire packet must arrive at router before it can be transmitted on next link v end-end delay = 2L/R (assuming zero propagation delay) one-hop numerical example: L = 7.5 Mbits R = 1.5 Mbps one-hop transmission delay = 5 sec more on delay shortly Introduction 1-29

30 Packet Switching: queueing delay, loss A R = 100 Mb/s C B queue of packets waiting for output link R = 1.5 Mb/s D E queuing and loss: v If arrival rate (in bits) to link exceeds transmission rate of link for a period of time: packets will queue, wait to be transmitted on link packets can be dropped (lost) if memory (buffer) fills up Introduction 1-30

31 Two key work-core functions routing: determines sourcedestination route taken by packets routing algorithms forwarding: move packets from router s input to appropriate router output routing algorithm local forwarding table header value output link dest address in arriving packet s header Network Layer 4-31

32 Alternative core: circuit switching end-end resources allocated to, reserved for call between source & dest: v v v v In diagram, each link has four circuits. call gets 2 nd circuit in top link and 1 st circuit in right link. dedicated resources: no sharing circuit-like (guaranteed) performance circuit segment idle if not used by call (no sharing) Commonly used in traditional telephone works Introduction 1-32

33 Circuit switching: FDM versus TDM FDM Example: 4 users frequency TD M time frequency time Introduction 1-33

34 Packet switching versus circuit switching packet switching allows more users to use work! example: 1 Mb/s link each user: 100 kb/s when active active 10% of time.. N users 1 Mbps link v circuit-switching: 10 users v packet switching: with 35 users, probability > 10 active at same time is less than.0004 * Q: how did we get value ? Q: what happens if > 35 users? * Check out the online interactive exercises for more examples Introduction 1-34

35 Packet switching vs circuit switching is packet switching a slam dunk winner? v great for bursty data resource sharing simpler, no call setup v excessive congestion possible: packet delay and loss protocols needed for reliable data transfer, congestion control v Q: ow to provide circuit-like behavior? bandwidth guarantees needed for audio/video apps still an unsolved problem (chapter 7) Q: human analogies of reserved resources (circuit switching) versus on-demand allocation (packet-switching)? Introduction 1-35

36 Inter structure: work of works v End systems connect to Inter via ISPs (Inter Service Providers) Residential, company and university ISPs v Access ISPs in turn must be interconnected. v So that any two hosts can send packets to each other v Resulting work of works is very complex v Evolution was driven by economics and national policies v Let s take a stepwise approach to describe current Inter structure Introduction 1-36

37 Inter structure: work of works Question: given millions of ISPs, how to connect them together? Introduction 1-37

38 Inter structure: work of works Option: connect each ISP to every other ISP? connecting each ISP to each other directly doesn t scale: O(N 2 ) connections. Introduction 1-38

39 Inter structure: work of works Option: connect each ISP to a global transit ISP? Customer and provider ISPs have economic agreement. global ISP Introduction 1-39

40 Inter structure: work of works But if one global ISP is viable business, there will be competitors. ISP A ISP B ISP C Introduction 1-40

41 Inter structure: work of works But if one global ISP is viable business, there will be competitors. which must be interconnected Inter exchange point ISP A IXP IXP ISP B ISP C peering link Introduction 1-41

42 Inter structure: work of works and regional works may arise to connect s to ISPS ISP A IXP IXP ISP B ISP C regional Introduction 1-42

43 Inter structure: work of works and content provider works (e.g., Google, Microsoft, Akamai ) may run their own work, to bring services, content close to end users ISP B ISP A ISP B IXP Content provider work IXP regional Introduction 1-43

44 Inter structure: work of works Tier 1 ISP Tier 1 ISP Google IX P Regional ISP IX P Regional ISP IX P v at center: small # of well-connected large works tier-1 commercial ISPs (e.g., Level 3, Sprint, AT&T, NTT), national & international coverage content provider work (e.g, Google): private work that connects it data centers to Inter, often bypassing tier-1, regional ISPs ISP ISP ISP ISP ISP ISP ISP ISP Introduction 1-44

45 Tier-1 ISP: e.g., Sprint POP: point-of-presence to/from backbone peering to/from customers Introduction 1-45

46 Inter Design Philosophy Simple core, complex edge Best effort service Great support for heterogeneity Dynamic by design One work for many, many purposes Designed primarily for non-real-time text traffic with no QoS requirements other than reliable delivery. Q: Does this explain why the inter does not work well for many applications? CSE S.Datta 46

47 Protocol Layers Networks are complex! many pieces : hosts routers links of various media applications protocols hardware, software Pros and cons of layering: explicit structure allows identification, relationship of complex system s pieces modularization eases maintenance, updating of system change of implementation of layer s service transparent to rest of system CSE S.Datta 47

48 Inter protocol stack application: supporting work applications FTP, SMTP, STTP transport: host-host data transfer TCP, UDP work: routing of datagrams from source to destination IP, routing protocols link: data transfer between neighboring work elements PPP, Ether physical: bits on the wire application transport work link physical CSE S.Datta 48

49 CSE S.Datta 49 message segment datagram frame source application transport work link physical t n l M t n M t M M destination application transport work link physical t n l M t n M t M M work link physical link physical t n l M t n M t n l M t n M t n l M t n l M router switch Encapsulation

50 Inter istory : Early packet-switching principles 1961: Kleinrock - queueing theory shows effectiveness of packetswitching 1964: Baran - packetswitching in military s 1967: ARPA conceived by Advanced Research Projects Agency 1969: first ARPA node operational 1972: ARPA demonstrated publicly NCP (Network Control Protocol) first host-host protocol first program ARPA has 15 nodes CSE S.Datta 50

51 Inter istory : Interworking, new and proprietary s 1970: ALOA satellite work in awaii 1973: Metcalfe s PhD thesis proposes Ether 1974: Cerf and Kahn - architecture for interconnecting works late70 s: proprietary architectures: DEC, SNA, XNA late 70 s: switching fixed length packets (ATM precursor) 1979: ARPA has 200 nodes Cerf and Kahn s interworking principles: minimalism, autonomy - no internal changes required to interconnect works best effort service model stateless routers decentralized control define today s Inter architecture CSE S.Datta 51

52 Inter istory 1990, 2000 s: commercialization, the Web, new apps Early 1990 s: ARPA decommissioned 1991: NSF lifts restrictions on commercial use of NSF (decommissioned, 1995) early 1990s: Web hypertext [Bush 1945, Nelson 1960 s] TML, TTP: Berners-Lee 1994: Mosaic, later Netscape late 1990 s: commercialization of the Web Late 1990 s 2000 s: more killer apps: instant messaging, P2P file sharing work security to forefront est. 50 million host, 100 million+ users backbone links running at Gbps CSE S.Datta 52

53 Reading: Ch 1, 2. Next: Delay and loss in works CSE S.Datta 53

end systems, access networks, links 1.3 network core

end systems, access networks, links 1.3 network core Chapter 1: roadmap 1.1 what is the Inter? 1.2 work edge end systems, works, links 1.3 work core packet switching, circuit switching, work structure 1.4 delay, loss, throughput in works 1.5 protocol layers,

More information

Computer Networks. Lecture 1: Introduction. Computer Networking: A Top Down Approach. Dr. Yaoqing Liu

Computer Networks. Lecture 1: Introduction. Computer Networking: A Top Down Approach. Dr. Yaoqing Liu Computer Networks Lecture 1: Introduction Dr. Yaoqing Liu liu@clarkson.edu Computer Networking: A Top Down Approach 6 th edition Jim Kurose, Keith Ross Addison-Wesley March 2012 Based on slides by J. F.

More information

Since enrollment is very small this semester, we have flexibilty. Traditional lecture Assigned reading, and then student(s) present during class time

Since enrollment is very small this semester, we have flexibilty. Traditional lecture Assigned reading, and then student(s) present during class time Syllabus You can go to cs.rpi.edu and then Faculty and my website from my profile Or you can go to www.cs.rpi.edu/~holzbh Or to be very direct, you can go to www.cs.rpi.edu/~holzbh/ccn18/index.php 1 Textbook

More information

Chapter 1: Introduction

Chapter 1: Introduction Chapter 1: Introduction Our goal: get context, overview, feel of networking more depth, detail later in course approach: descriptive use Internet as example Overview: what s the Internet what s a protocol?

More information

Chapter 1: introduction

Chapter 1: introduction Chapter 1: introduction our goal: v get feel and terminology v more depth, detail later in course v approach: use Internet as example overview: v what s the Internet? v what s a protocol? v edge; hosts,

More information

Computer Networking Introduction

Computer Networking Introduction Computer Networking Introduction Halgurd S. Maghdid Software Engineering Department Koya University-Koya, Kurdistan-Iraq Lecture No.1 Chapter 1 Introduction Text Book for this course Computer Networking:

More information

What s a protocol? What s a protocol? A closer look at network structure: What s the Internet? Hardware view: What s the Internet?

What s a protocol? What s a protocol? A closer look at network structure: What s the Internet? Hardware view: What s the Internet? What s the Internet? Hardware view: What s the Internet? Hardware view: PC server wireless laptop cellular handheld access points wired s connected computing devices: hosts = end systems running apps communication

More information

What s a protocol? What s a protocol? A closer look at network structure: What s the Internet? What s the Internet? What s the Internet?

What s a protocol? What s a protocol? A closer look at network structure: What s the Internet? What s the Internet? What s the Internet? What s the Internet? PC server laptop cellular handheld access points wired s connected computing devices: hosts = end systems running apps communication s fiber, copper, radio transmission rate = bandwidth

More information

CSE 4213: Computer Networks II

CSE 4213: Computer Networks II CSE 4213: Computer Networks II Administrivia Course webpage: http://www.cs.yorku.ca/course/4213 Lectures: on-wed 4:00-5:30 pm (CB 120) Textbook: Suprakash Datta datta@cs.yorku.ca Office: CSEB 3043 Phone:

More information

CS 204: Advanced Computer Networks

CS 204: Advanced Computer Networks CS 204: Advanced Computer Networks Jiasi Chen Lectures: MWF 12:10-1pm Humanities and Social Sciences 1403 http://www.cs.ucr.edu/~jiasi/teaching/cs204_spring17/ 1 Why Networks? Supports the applications

More information

Announcements. TAs office hours: Mohamed Grissa: Mohamed Alkalbani:

Announcements. TAs office hours: Mohamed Grissa: Mohamed Alkalbani: Announcements TAs office hours: Mohamed Grissa: grissam@oregonstate.edu Tuesday: 4-5 Friday: 11-12 Mohamed Alkalbani: alkalbmo@oregonstate.edu Wednesday: 11-12 Thursday: 11-12 Lecture slides: Will be posted

More information

Part I: Introduction. 1: Introduction 1

Part I: Introduction. 1: Introduction 1 Part I: Introduction Chapter goal: get context, overview, feel of networking more depth, detail later in course approach: descriptive use Internet as example Overview: what s the Internet what s a protocol?

More information

A Whirlwind Introduction to the Internet Overview

A Whirlwind Introduction to the Internet Overview CS 455/555 / Spring 2013 Intro to Networks and Communications Whirlwind Introduction to the Inter (part 1) Dr. Michele C. Weigle http://www.cs.odu.edu/~mweigle/cs455-s13/ A Whirlwind Introduction to the

More information

Fundamentals of Information Systems

Fundamentals of Information Systems Fundamentals of Information Systems Computer Networking Module Year 2017/2018 Master Degree in Data Science Armir Bujari abujari@math.unipd.it About the module Requirements No strict requirement, however,

More information

Computer Networks and the Internet. CMPS 4750/6750: Computer Networks

Computer Networks and the Internet. CMPS 4750/6750: Computer Networks Computer Networks and the Inter CMPS 4750/6750: Computer Networks Outline What Is the Inter? Access Networks Packet Switching and Circuit Switching A closer look at delay, loss, and throughput Interconnection

More information

Announcements. CS 5565 Network Architecture and Protocols. Outline for today. The Internet: nuts and bolts view. The Internet: nuts and bolts view

Announcements. CS 5565 Network Architecture and Protocols. Outline for today. The Internet: nuts and bolts view. The Internet: nuts and bolts view Announcements CS 5565 Network Architecture and Protocols Lecture 2 Godmar Back Created Lectures Page Created CS5565 Forum Use this to find a project partner All projects will be done in groups of up to

More information

Chapter 1 Introduction

Chapter 1 Introduction Chapter 1 Introduction A note on the use of these ppt slides: We re making these slides freely available to all (faculty, students, readers). They re in PowerPoint form so you can add, modify, and delete

More information

CSC 401 Data and Computer Communications Networks

CSC 401 Data and Computer Communications Networks CSC 401 Data and Computer Communications Networks Computer Networks and The Inter Sec 1.3 Prof. Lina Battestilli Fall 2017 Outline Computer Networks and the Inter (Ch 1) 1.1 What is the Inter? 1.2 work

More information

end systems, access networks, links circuit switching, packet switching, network structure

end systems, access networks, links circuit switching, packet switching, network structure Chapter 1: roadmap 1.1 What is the Internet? 1.2 Network edge end systems, access networks, links 1.3 Network core circuit switching, packet switching, network structure 1.4 Delay, loss and throughput

More information

Web Protocols and Practice

Web Protocols and Practice Web Protocols and Practice Dogan Kesdogan Aachen University of Technology Department of Computer Science IV Communication and Distributed Systems Introduction 1-1 Staff Instructor: Dogan Kesdogan, kesdogan@informatik.rwth-aachen.de

More information

Chapter 1 Introduction

Chapter 1 Introduction Chapter 1 Introduction Introduction Prof. Sungwook Kim ( 김승욱 ) AS building 903 Tel : 02) 705-8932 E-mail : swkim01@sogang.ac.kr TA : Joonsu Ryu ( 류준수 ) AS building 901 E-mail : sok54833@naver.com Chapter

More information

CSEN 503 Introduction to Communication Networks

CSEN 503 Introduction to Communication Networks CSEN 503 Introduction to Communication Networks 1-1 Mervat AbuElkheir Hana Medhat Ayman Dayf ** Slides are attributed to J. F. Kurose People and Resources 1-2 Course Name Introduction to Communication

More information

Part 1: Introduction. Goal: Review of how the Internet works Overview

Part 1: Introduction. Goal: Review of how the Internet works Overview Part 1: Introduction Goal: Review of how the Internet works Overview Get context Get overview, feel of the Internet Application layer protocols and addressing Network layer / Routing Link layer / Example

More information

Internet Architecture & Performance. What s the Internet: nuts and bolts view

Internet Architecture & Performance. What s the Internet: nuts and bolts view Internet Architecture & Performance Internet, Connection, Protocols, Performance measurements What s the Internet: nuts and bolts view millions of connected computing devices: hosts, end systems pc s workstations,

More information

Lecture Computer Networks WS 2016/2017

Lecture Computer Networks WS 2016/2017 Lecture Computer Networks WS 2016/2017 Prof. Dr. Werner Filip filip@fb2.fra-uas.de 1-1 References James F. Kurose, Keith W. Ross, Computer Networking, A Top-Down Approach, (6th Edition), Pearson, 2012.

More information

Network and Mobile Compu4ng in the 20 th Century and Beyond. COMP 1400 Memorial University Winter 2015

Network and Mobile Compu4ng in the 20 th Century and Beyond. COMP 1400 Memorial University Winter 2015 Network and Mobile Compu4ng in the 20 th Century and Beyond COMP 1400 Memorial University Winter 2015 What s the Internet: nuts and bolts view PC server wireless laptop smartphone wireless links wired

More information

Introduction to Computer Networking II. Abdusy Syarif Informatics Department Faculty of Computer Science Universitas Mercu Buana

Introduction to Computer Networking II. Abdusy Syarif Informatics Department Faculty of Computer Science Universitas Mercu Buana Introduction to Computer Networking II Abdusy Syarif Informatics Department Faculty of Computer Science Universitas Mercu Buana Teaching Method E-learning Class Individual assignment Quiz See schedule

More information

Network Protocols and Architectures

Network Protocols and Architectures Network Protocols and Architectures Introduction 1 What s the Internet: nuts and bolts view Millions of connected computing devices: hosts, end-systems PC s workstations, servers PDA s, phones, toasters

More information

Overview on the Internet the current and future telecommunication network

Overview on the Internet the current and future telecommunication network Overview on the Internet the current and future telecommunication network Computer Networking: A Top Down Approach, 5 th edition. Jim Kurose, Keith Ross Addison-Wesley, April 2009. Introduction 1-1 Introduction

More information

CSE3213 Computer Network I

CSE3213 Computer Network I CSE3213 Computer Network I Introduction Course page: http://www.cse.yorku.ca/course/3213 1 Course Contents 3 general areas: data communications, networking, and protocols 1. Data communications: basic

More information

end systems, access networks, links circuit switching, packet switching, network structure

end systems, access networks, links circuit switching, packet switching, network structure Introduction Chapter 1: roadmap 1.1 What is the Internet? 1.2 Network edge end systems, access networks, links 1.3 Network core circuit switching, packet switching, network structure 1.4 Delay, loss and

More information

CSC 4900 Computer Networks: Introduction

CSC 4900 Computer Networks: Introduction CSC 4900 Computer Networks: Introduction Professor Henry Carter Fall 2017 What s this all about? 2 A Modern Day Silk Road We live with nearly constant access to the most extensive system ever built by

More information

CS 3516: Computer Networks

CS 3516: Computer Networks Welcome to CS 3516: Computer Networks Prof. Yanhua Li Time: 9:00am 9:50am M, T, R, and F Location: AK219 Fall 2018 A-term 1 Some slides are originally from the course materials of the textbook Computer

More information

A Whirlwind Introduction to the Internet. A Whirlwind Introduction to the Internet Overview

A Whirlwind Introduction to the Internet. A Whirlwind Introduction to the Internet Overview CPSC 852 Intering A Whirlwind Introduction to the Internet Michele Weigle Department of Computer Science Clemson University mweigle@cs.clemson.edu http://www.cs.clemson.edu/~mweigle/courses/cpsc852 1 A

More information

Introduction to computer networking

Introduction to computer networking edge core Introduction to computer networking Comp Sci 3600 Security Outline edge core 1 2 edge 3 core 4 5 6 The edge core Outline edge core 1 2 edge 3 core 4 5 6 edge core Billions of connected computing

More information

CS 332: Computer Networks Introduction

CS 332: Computer Networks Introduction CS 332: Computer Networks Introduction Professor Doug Szajda Thanks! I ve taught this course many times, the most recent being Spring 2014. Each time calls for a rethinking of the topics and new material.

More information

COMP 431 Internet Services & Protocols. A Whirlwind Introduction to the Internet ( Networking Nouns and Verbs ) Jasleen Kaur

COMP 431 Internet Services & Protocols. A Whirlwind Introduction to the Internet ( Networking Nouns and Verbs ) Jasleen Kaur There is a poll posted on piazza. Please take a minute to fill it out. COMP 431 Internet Services & Protocols A Whirlwind Introduction to the Internet ( Networking Nouns and Verbs ) Jasleen Kaur January

More information

Lecture 2: Internet Structure

Lecture 2: Internet Structure Lecture 2: Internet Structure COMP 332, Spring 2018 Victoria Manfredi Acknowledgements: materials adapted from Computer Networking: A Top Down Approach 7 th edition: 1996-2016, J.F Kurose and K.W. Ross,

More information

Welcome to CS 340 Introduction to Computer Networking

Welcome to CS 340 Introduction to Computer Networking Welcome to CS 340 Introduction to Computer ing Overview Course Administrative Trivia Internet Architecture Protocols Edge A taxonomy of communication networks Some slides are in courtesy of J. Kurose and

More information

end systems, access networks, links circuit switching, packet switching, network structure

end systems, access networks, links circuit switching, packet switching, network structure Chapter 1: roadmap 1.1 What is the Internet? 1.2 Network edge end systems, access networks, links 1.3 Network core circuit switching, packet switching, network structure 1.4 Delay, loss and throughput

More information

Networks Overview. Dr. Yingwu Zhu

Networks Overview. Dr. Yingwu Zhu Networks Overview Dr. Yingwu Zhu 1 Networking is everywhere! Internet, ad-hoc wireless networks, sensor networks Networking devices: Computers, PDAs, i-pods, sensor nodes, others Networking services Web,

More information

Chapter 1 Introduction

Chapter 1 Introduction Chapter 1 Computer Networking: A Top Down Approach 6 th edition Jim Kurose, Keith Ross Addison-Wesley March 2012 All material copyright 1996-2012 J.F Kurose and K.W. Ross, All Rights Reserved Chapter 1:

More information

Chapter I: Introduction

Chapter I: Introduction Chapter I: Introduction UG3 Computer Communications & Networks (COMN) Myungjin Lee myungjin.lee@ed.ac.uk Slides copyright of Kurose and Ross The work core mesh of interconnected routers packet-switching:

More information

Informática y Comunicaciones. Chapter 1 Introduction to Communications

Informática y Comunicaciones. Chapter 1 Introduction to Communications Informática y Comunicaciones Chapter 1 Introduction to Communications All material copyright 1996-2012 J.F Kurose and K.W. Ross, All Rights Reserved Introduction to Communications 1-1 Chapter 1: introduction

More information

Δίκτυα Μετάδοσης Δεδομένων Data Networks. Introduction 1-1

Δίκτυα Μετάδοσης Δεδομένων Data Networks. Introduction 1-1 Δίκτυα Μετάδοσης Δεδομένων Data Networks Introduction 1-1 Computer Networking: A Top Down Approach 6 th edition Jim Kurose, Keith Ross Addison-Wesley All material copyright J.F Kurose and K.W. Ross, All

More information

RSC Part I: Introduction

RSC Part I: Introduction RSC Part I: Introduction Redes y Servicios de Comunicaciones Universidad Carlos III de Madrid These slides are, mainly, part of the companion slides to the book Computer Networking: A Top Down Approach

More information

COMP 562: Advanced Topics in Networking

COMP 562: Advanced Topics in Networking COMP 562: Advanced Topics in Networking Qian Zhang Spring 2009 HKUST Introduction 1-1 Course Info Instructor: Qian Zhang www.cs.ust.hk/~qianzh Course web site http://www.cs.ust.hk/~qianzh/comp562 2009/comp562

More information

Lecture 1 - Introduction

Lecture 1 - Introduction Lecture 1 - Introduction Networks and Security Jacob Aae Mikkelsen IMADA September 2, 2013 September 2, 2013 1 / 82 Outline Goals today Get feel and terminology More depth and details later in the course

More information

CSE 434 Spring 2013 Computer Networks

CSE 434 Spring 2013 Computer Networks CSE 434 Spring 2013 Computer Networks Georgios Varsamopoulos Arizona State University What is this course about? Students will learn How works are designed and structured What is the architecture of the

More information

Internet Routing. Review of Networking Principles. What s the Internet: nuts and bolts view. Communication links

Internet Routing. Review of Networking Principles. What s the Internet: nuts and bolts view. Communication links Internet Routing Review of Networking Principles 1 What s the Internet: nuts and bolts view Millions of connected computing devices: hosts, end-systems PC s workstations, servers PDA s, phones, toasters

More information

Internet Routing. Review of Networking Principles

Internet Routing. Review of Networking Principles Internet Routing Review of Networking Principles 1 What s the Internet: nuts and bolts view Millions of connected computing devices: hosts, end-systems PC s workstations, servers PDA s, phones, toasters

More information

Foundations of Telematics

Foundations of Telematics Foundations of Telematics Chapter 1 Introduction Acknowledgement: These slides have been prepared by J.F. Kurose and K.W. Ross Foundations of Telematics (AMW SS 2010): 01 Introduction 1 Chapter 1: Introduction

More information

Internet: A Brief Overview. Introduction 2-1

Internet: A Brief Overview. Introduction 2-1 Inter: A Brief Overview Introduction 2-1 Quick Questions v What is the Inter? v How was it invented and developed? https://www.youtube.com/v/9hiqjrmhtv4 Text: http://www.intersociety.org/inter/what-inter/

More information

Computer Networking Introduction

Computer Networking Introduction Computer Networking Introduction Halgurd S. Maghdid Software Engineering Department Koya University-Koya, Kurdistan-Iraq Lecture No.2 Chapter 1: roadmap 1.1 what is the Inter? 1.2 work edge end systems,

More information

Introduction to Computer Networks. Chapter 1: introduction

Introduction to Computer Networks. Chapter 1: introduction Introduction to Computer Networks EECS 3214 Slides courtesy of J.F Kurose and K.W. Ross, All Rights Reserved Introduction 1-1 Chapter 1: introduction our goal: get feel and terminology more depth, detail

More information

Introduction to Computer Networks. Roadmap

Introduction to Computer Networks. Roadmap Introduction to Computer Networks Miguel A. Labrador Department of Computer Science & Engineering labrador@csee.usf.edu http://www.csee.usf.edu/~labrador 1 Dr. Miguel A. Labrador Roadmap 1.1 What is the

More information

Chapter 1. Computer Networks and the Internet

Chapter 1. Computer Networks and the Internet Chapter 1 Computer Networks and the Internet Internet traffic What s the Internet? (hardware) PC server wireless laptop cellular handheld wired links millions of connected computing devices: hosts = end

More information

LECTURE 1 - INTRODUCTION. Jacob Aae Mikkelsen

LECTURE 1 - INTRODUCTION. Jacob Aae Mikkelsen LECTURE 1 - INTRODUCTION Jacob Aae Mikkelsen GOALS TODAY History of networks Get "feel" and terminology More depth and details later in the course Approach: Use Internet as example ORIGIN OF THE INTERNET

More information

Telecommunication Networks Introduction

Telecommunication Networks Introduction Telecommunication Networks Introduction Telemedicina e e-saúde 2016/17 Pedro Brandão References These slides are the companions of Computer Networking: A Top Down Approach 5th edition. Jim Kurose, Keith

More information

Chapter 1 Computer Networks and the Internet

Chapter 1 Computer Networks and the Internet CSB051 Computer Networks 電腦網路 Chapter 1 Computer Networks and the Internet 吳俊興 國立高雄大學資訊工程學系 Outline 1.1 What is the Internet? 1.2 Network edge 1.3 Network core 1.4 Access networks and physical media 1.5

More information

Computer Networks. Instructor: Niklas Carlsson Office: B:476 Office Hours: TBA

Computer Networks. Instructor: Niklas Carlsson   Office: B:476 Office Hours: TBA Computer Networks Instructor: Niklas Carlsson Email: niklas.carlsson@liu.se Office: B:476 Office Hours: TBA Notes derived from Computer Networking: A Top Down Approach, by Jim Kurose and Keith Ross, Addison-Wesley.

More information

Computer Networking: A Top Down Approach

Computer Networking: A Top Down Approach Computer Networking: A Top Down Approach Seventh Edition Chapter 1 Introduction Slides in this presentation contain hyperlinks. JAWS users should be able to get a list of links by using INSERT+F7 Introduction

More information

What is a Distributed System? Module 1: Introduction to Networking & Internetworking

What is a Distributed System? Module 1: Introduction to Networking & Internetworking What is a Distributed System? 1 Working Definition A distributed system is several computers doing something together Three primary features of a distributed system Multiple computers Communications Virtual

More information

EECS 3214: Computer Network Protocols and Applications

EECS 3214: Computer Network Protocols and Applications EECS 3214: Computer Network Protocols and Applications Suprakash Datta Course page: http://www.eecs.yorku.ca/course/3214 Office: LAS 3043 Email: datta [at] cse.yorku.ca These slides are adapted from Jim

More information

CS 3516: Advanced Computer Networks

CS 3516: Advanced Computer Networks Welcome to CS 3516: Advanced Computer Networks Prof. Yanhua Li Time: 9:00am 9:50am M, T, R, and F Location: Fuller 320 Fall 2017 A-term 1 Some slides are originally from the course materials of the textbook

More information

Module 2 Overview of Computer Networks

Module 2 Overview of Computer Networks Module 2 Overview of Computer Networks Networks and Communication Give me names of all employees Who earn more than $00,000 ISP intranet backbone satellite link desktop computer: server: network link:

More information

Module 2 Overview of. Computer Networks

Module 2 Overview of. Computer Networks Module Overview of Networks and Communication Give me names of all employees Who earn more than $00,000 ISP intranet backbone satellite link desktop computer: server: network link: CS454/654 - Issues How

More information

Computer Networks and the internet. Daniel Graham Ph.D

Computer Networks and the internet. Daniel Graham Ph.D Computer Networks and the internet Daniel Graham Ph.D 1.1 What Is the Internet? The Internet is a computer network that interconnects hundreds of millions of computing devices throughout the world. As

More information

ECPE / COMP 177 Fall Some slides from Kurose and Ross, Computer Networking, 5 th Edition

ECPE / COMP 177 Fall Some slides from Kurose and Ross, Computer Networking, 5 th Edition ECPE / COMP 177 Fall 2014 Some slides from Kurose and Ross, Computer Networking, 5 th Edition Instructor: Dr. Jeff Shafer Email: jshafer at pacific dot edu Office: Anderson 205 Office hours (posted on

More information

CS 471G Friday, 11 January Introduction 2-1

CS 471G Friday, 11 January Introduction 2-1 CS 471G Friday, 11 January 2013 Introduction 2-1 Chapter 1 Introduction A note on the use of these ppt slides: We re making these slides freely available to all (faculty, students, readers). They re in

More information

Telecommunication Networks Introduction

Telecommunication Networks Introduction Telecommunication Networks Introduction Telemedicina e e-saúde 2011/12 Pedro Brandão References These slides are the companions of Computer Networking: A Top Down Approach 5th edition. Jim Kurose, Keith

More information

TDTS06: Computer Networks

TDTS06: Computer Networks TDTS06: Computer Networks Instructor: Niklas Carlsson Email: niklas.carlsson@liu.se Office: B:476 Office Hours: TBA Notes derived from Computer Networking: A Top Down Approach, by Jim Kurose and Keith

More information

COSC 4213: Computer Networks II

COSC 4213: Computer Networks II COSC 4213: Computer Networks II Suprakash Datta datta@cs.yorku.ca These slides are adapted from Jim Kurose s slides. Administrivia Course webpage: http://www.cs.yorku.ca/course/4213 Lectures: Tue-Thu 5:30-7:00

More information

Computer Networking Introduction

Computer Networking Introduction Computer Networking Introduction Halgurd S. Maghdid Software Engineering Department Koya University-Koya, Kurdistan-Iraq Lecture No.3 Chapter 1: roadmap 1.1 what is the Internet? 1.2 network edge end systems,

More information

A Whirlwind Introduction to the Internet. A Whirlwind Introduction to the Internet Overview

A Whirlwind Introduction to the Internet. A Whirlwind Introduction to the Internet Overview CPSC 360 Network Programming A Whirlwind Introduction to the Internet Michele Weigle Department of Computer Science Clemson University mweigle@cs.clemson.edu January 11, 2006 http://www.cs.clemson.edu/~mweigle/courses/cpsc360

More information

COMP 361 Networks I Spring 2005 last revised 14/02/05

COMP 361 Networks I Spring 2005 last revised 14/02/05 COMP 361 Networks I Spring 2005 last revised 14/02/05 Instructor: Mordecai Golin www.cs.ust.hk/~golin http://course.cs.ust.hk/comp361/spr2005_l1/ (or via instructor s web site) contains all notes, announcements,

More information

CS4491/02 Fog Computing. Network Basics

CS4491/02 Fog Computing. Network Basics CS4491/02 Fog Computing Network Basics What s the Inter: nuts and bolts view PC server wireless laptop smartphone wireless links wired links millions of connected computing devices: hosts = end systems

More information

CSEE 4119 Computer Networks. Chapter 1 Introduction (4/4) Introduction 1-1

CSEE 4119 Computer Networks. Chapter 1 Introduction (4/4) Introduction 1-1 CSEE 4119 Computer Networks Chapter 1 Introduction (4/4) Introduction 1-1 Chapter 1: roadmap 1.1 What is the Internet? 1.2 Network edge! end systems, access networks, links 1.3 Network core! circuit switching,

More information

Chapter 1: introduction

Chapter 1: introduction Chapter 1: introduction our goal: v get feel and terminology v more depth, detail later in course v approach: use Inter as example overview: v what s the Inter? v what s a protocol? v work edge; hosts,,

More information

Switching Networks (Fall 2010) EE 586 Communication and. August 27, Lecture 2. (modified by Cheung for EE586; based on K&R original) 1-1

Switching Networks (Fall 2010) EE 586 Communication and. August 27, Lecture 2. (modified by Cheung for EE586; based on K&R original) 1-1 EE 586 Communication and Switching Networks (Fall 2010) Lecture 2 August 27, 2010 (modified by Cheung for EE586; based on K&R original) 1-1 Announcements Read Chapter 1 First homework is due 9/3 In Blackboard

More information

Introduction to Data Communication

Introduction to Data Communication Introduction to Data Communication Tor Skeie Email: tskeie@ifi.uio.no (based on slides from Kjell Åge Bringsrud and Carsten Griwodz) INF1060 Introduction 1 Introduction Goal Give an overview of the topic

More information

CSC 401 Data and Computer Communications Networks

CSC 401 Data and Computer Communications Networks CSC 401 Data and Computer Communications Networks Computer Networks and The Internet Sec 1.1 and 1.2 Prof. Lina Battestilli Fall 2017 Outline Computer Networks and the Internet (Ch 1) 1.1 What is the Internet?

More information

Part I: Introduction. Cool internet appliances. What s a protocol? What s the Internet: nuts and bolts view. What s the Internet: nuts and bolts view

Part I: Introduction. Cool internet appliances. What s a protocol? What s the Internet: nuts and bolts view. What s the Internet: nuts and bolts view Part I: Introduction Assignment: read chapter 1 in text What s the Internet: nuts and bolts view Our goal: get context, overview, feel of ing more depth, detail later in course approach: descriptive use

More information

Introduction. overview: our goal: get feel and terminology more depth, detail later in course approach: use Internet as example

Introduction. overview: our goal: get feel and terminology more depth, detail later in course approach: use Internet as example Introduction our goal: get feel and terminology more depth, detail later in course approach: use Inter as example overview: what s the Inter? what s a protocol? work edge; hosts,, physical media work core:

More information

Goal Give an overview of the topic Approach Descriptive Use Internet as example. Content. What is the Internet?

Goal Give an overview of the topic Approach Descriptive Use Internet as example. Content. What is the Internet? Introduction What is the Internet? Introduction to Data Communication Kjell Åge Bringsrud (basert på lysark av Carsten Griwodz) INF1060 Introduction 1 Goal Give an overview of the topic Approach Descriptive

More information

Computer Networks 2012/2013. Introduction part 1 (01) Dr. Tanir Ozcelebi. Thanks to A. Leon-Garcia & I. Widjaja, & I. Radovanovic & A. S.

Computer Networks 2012/2013. Introduction part 1 (01) Dr. Tanir Ozcelebi. Thanks to A. Leon-Garcia & I. Widjaja, & I. Radovanovic & A. S. Computer Networks 2012/20 Introduction part 1 (01) Dr. Thanks to A. Leon-Garcia & I. Widjaja, & I. Radovanovic & A. S. Tanenbaum System Architecture and Networking Group Outline What is the Internet? Why

More information

Computer Communication Networks

Computer Communication Networks Contents ELL 785 Computer Communication Networks Introduction Lecture 1 Taxonomy of communication works Computer Communication Networks Building a work ed work architecture 1-1 Introduction PC server wireless

More information

Agententechnologien in der Telekommunikation

Agententechnologien in der Telekommunikation Agententechnologien in der Telekommunikation Sommersemester 2009 Dr. Fikret Sivrikaya fikret.sivrikaya@dai-labor.de Lecture 1 29.04.2009 Agententechnologien in betrieblichen Anwendungen und der Telekommunikation

More information

Internet: A Brief Overview. Chapter 1

Internet: A Brief Overview. Chapter 1 Inter: A Brief Overview Chapter 1 Chapter 1: introduction our goal: v get feel and terminology v more depth, detail later in course v approach: use Inter as example overview: v what s the Inter? v what

More information

Chapter 1 Introduction

Chapter 1 Introduction Chapter 1 Introduction A note on the use of these ppt slides: We re making these slides freely available to all (faculty, students, readers). They re in PowerPoint form so you see the animations; and can

More information

Chapter 1 Introduction

Chapter 1 Introduction Chapter 1 Introduction A note on the use of these ppt slides: We re making these slides freely available to all (faculty, students, readers). They re in PowerPoint form so you see the animations; and can

More information

Chapter 1 Introduction

Chapter 1 Introduction Chapter 1 Introduction Slightly adapted from -- Computer Networking: A Top Down Approach, 5 th edition. Jim Kurose, Keith Ross Addison-Wesley, April 2009. All material copyright 1996-2009 J.F Kurose and

More information

Chapter 1 Introduction

Chapter 1 Introduction Chapter 1 Introduction A note on the use of these ppt slides: We re making these slides freely available to all (faculty, students, readers). They re in PowerPoint form so you see the animations; and can

More information

Chapter 1 Introduction

Chapter 1 Introduction Chapter 1 Introduction A note on the use of these ppt slides: We re making these slides freely available to all (faculty, students, readers). They re in PowerPoint form so you see the animations; and can

More information

CMPE 150/L : Introduction to Computer Networks. Chen Qian Computer Engineering UCSC Baskin Engineering Lecture 3

CMPE 150/L : Introduction to Computer Networks. Chen Qian Computer Engineering UCSC Baskin Engineering Lecture 3 CMPE 150/L : Introduction to Computer Networks Chen Qian Computer Engineering UCSC Baskin Engineering Lecture 3 1 No Class 1/23 (next Tuesday) Dr. Qian absent to serve a duty for US Department of Energy

More information

Module 1 Introduction CS655! 1-1!

Module 1 Introduction CS655! 1-1! Module 1 Introduction 1-1! What s a Distributed System? A distributed system is a collection of independent computers that appear to the users of the system as a single computer Example:! a network of

More information

CNT 4007 Computer Networks - Chapter 1 : Overview

CNT 4007 Computer Networks - Chapter 1 : Overview CNT 4007 Computer Networks - Chapter 1 : Overview Jonathan Kavalan, Ph.D. Department of Computer, Information Science and Engineering (CISE), University of Florida 1 Chapter 1: Introduction Our goal: get

More information

Read Chapter 1 of Kurose-Ross

Read Chapter 1 of Kurose-Ross CSE 422 Notes, Set 1 These slides contain materials provided with the text: Computer Networking: A Top Down Approach,5 th edition, by Jim Kurose and Keith Ross, Addison-Wesley, April 2009. Additional figures

More information

Chapter 1 Introduction

Chapter 1 Introduction Chapter 1 Introduction Adapted from material copyright 1996-2012 J.F Kurose and K.W. Ross, All Rights Reserved Computer Networking: A Top Down Approach 6 th edition Jim Kurose, Keith Ross Addison-Wesley

More information

EC441 Fall 2018 Introduction to Computer Networking Chapter 1: Introduction

EC441 Fall 2018 Introduction to Computer Networking Chapter 1: Introduction EC441 Fall 2018 Introduction to Computer Networking Chapter 1: Introduction This presentation is adapted from slides produced by Jim Kurose and Keith Ross for their book, Computer Networking: A Top Down

More information