Module 2 Overview of Computer Networks
|
|
|
- Osborn Rich
- 5 years ago
- Views:
Transcription
1 Module 2 Overview of Computer Networks
2 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/
3 Issues How do the request and response get transmitted between the requestor and the server? Protocols to facilitate communication Moving the request and reply messages through the network What are the modes of communication between the requestor and the responder? Connectionless service Connection-oriented service CS454/
4 What is a protocol? A protocol defines the format and the order of messages sent and received among network entities, and the actions taken on message transmission and receipt Human protocols: What s the time? I have a question introductions Network protocols: machines rather than humans all communication activity in Internet governed by protocols CS454/
5 What s a protocol? Human protocol Computer protocol Hi Hi Got the time? 2:00 time TCP connection req. TCP connection reply. Get <index.html> CS454/
6 Layered Protocols Divide functionality to different layers and let each layer provide one function. ISO OSI Layered network architecture Function layers Interfaces Protocols at each layer From Tanenbaum and van Steen, Distributed Systems: Principles and Paradigms CS454/654 Prentice-Hall, Inc
7 Message Format From Tanenbaum and van Steen, Distributed Systems: Principles and Paradigms CS454/654 Prentice-Hall, Inc
8 Message Transmission (Assume only 3 layers) CS454/
9 OSI Protocol Summary Layer Description Examples Application Protocols that are designed to meet the communication requirements of HTTP, FTP, SMTP, specific applications, often defining the interface to a service. CORBA IIOP Presentation Protocols at this level transmit data in a network representation that is independent of the representations used in individual computers, which may differ. Encryption is also performed in this layer, if required. Secure Sockets (SSL),CORBA Data Rep. Session At this level reliability and adaptation are performed, such as detection of failures and automatic recovery. Transport This is the lowest level at which messages (rather than packets) are handled. Messages are addressed to communication ports attached to processes, Protocols in this layer may be connection-oriented or connectionless. TCP, UDP Network Data link Physical Transfers data packets between computers in a specific network. In a WAN or an internetwork this involves the generation of a route passing through routers. In a single LAN no routing is required. Responsible for transmission of packets between nodes that are directly connected by a physical link. In a WAN transmission is between pairs of routers or between routers and hosts. In a LAN it is between any pair of hosts. The circuits and hardware that drive the network. It transmits sequences of binary data by analogue signalling, using amplitude or frequency modulation of electrical signals (on cable circuits), light signals (on fibre optic circuits) or other electromagnetic signals (on radio and microwave circuits). IP, ATM virtual circuits Ethernet MAC, ATM cell transfer, PPP Ethernet base- band signalling, ISDN From Coulouris, Dollimore and Kindberg, Distributed Systems: Concepts and Design, 3rd ed. Addison-Wesley Publishers 2000 CS454/
10 Internet Protocols Application (7) Presentation (6) Session (5) HTML, CGI, Java, HTTP FTP Telnet NFS SMTP HTTP Transport (4) TCP UDP Network (3) IP Data Link (2) Physical () X.25 Ethernet RNIS ATM FDDI CS454/
11 TCP/IP Layers Layers Message Application Transport Internet Network interface Messages (UDP) or Streams (TCP) UDP or TCP packets IP datagrams Network-specific frames Underlying network From Coulouris, Dollimore and Kindberg, Distributed Systems: Concepts and Design, 3rd ed. Addison-Wesley Publishers 2000 CS454/654 2-
12 Internet Protocol Stack application: supporting network applications ftp, smtp, http transport: host-host data transfer tcp, udp network: routing of datagrams from source to destination ip, routing protocols link: data transfer between neighboring network elements ppp, ethernet physical: bits on the wire application transport network link physical message segment datagram frame CS454/
13 Applications and Application- Layer Protocols Application: communicating, distributed processes running in network hosts in user space application transport network data link physical exchange messages to implement app e.g., , file transfer, the Web Application-layer protocols one piece of an app define messages exchanged by apps and actions taken use services provided by lower layer protocols application transport network data link physical application transport network data link physical router workstation server mobile CS454/
14 Application-Layer Protocols (cont). API: application programming interface Defines interface between application and transport layer socket: Internet API two processes communicate by sending data into socket, reading data out of socket What transport services does an application need? Data loss some apps (e.g., audio) can tolerate some loss other apps (e.g., file transfer, telnet) require 00% reliable data transfer Bandwidth some apps (e.g., multimedia) require a minimum amount of bandwidth to be effective other apps ( elastic apps ) make use of whatever bandwidth they get Timing some apps (e.g., Internet telephony, interactive games) require low delay to be effective CS454/
15 Transport Service Requirements of Common Applications Application Data loss Bandwidth Time Sensitive file transfer Web documents real-time audio/video stored audio/video interactive games financial apps no loss no loss no loss loss-tolerant loss-tolerant loss-tolerant no loss elastic elastic elastic audio: 5Kb-Mb video:0kb-5mb same as above few Kbps up elastic no no no yes, 00 s msec yes, few secs yes, 00 s msec yes and no CS454/
16 Internet Transport Protocol Services TCP service: connection-oriented: setup required between client, server reliable transport between sending and receiving process flow control: sender won t overwhelm receiver congestion control: throttle sender when network overloaded does not provide: timing, minimum bandwidth guarantees UDP service: unreliable data transfer between sending and receiving process does not provide: connection setup, reliability, flow control, congestion control, timing, or bandwidth guarantee CS454/
17 Internet Apps: Their Protocols and Transport Protocols Application remote terminal access Web file transfer streaming multimedia remote file server Internet telephony Application layer protocol smtp [RFC 82] telnet [RFC 854] http [RFC 2068] ftp [RFC 959] proprietary (e.g. RealNetworks) NFS proprietary (e.g., Vocaltec) Underlying transport protocol TCP TCP TCP TCP TCP or UDP TCP or UDP typically UDP CS454/
18 TCP Message Encapsulation over an Ethernet Application message TCP header port IP header TCP Ethernet header IP Ethernet frame From Coulouris, Dollimore and Kindberg, Distributed Systems: Concepts and Design, 3rd ed. Addison-Wesley Publishers 2000 CS454/
19 The programmer's conceptual view of a TCP/IP Internet Application TCP Application UDP IP From Coulouris, Dollimore and Kindberg, Distributed Systems: Concepts and Design, 3rd ed. Addison-Wesley Publishers 2000 CS454/
20 Internet Address Structure 7 24 Class A: 0 Network ID Host ID 4 6 Class B: 0 Network ID Host ID 2 8 Class C: 0 Network ID Host ID Class D (multicast): 0 Multicast address Class E (reserved): 0 unused From Coulouris, Dollimore and Kindberg, Distributed Systems: Concepts and Design, 3rd ed. Addison-Wesley Publishers 2000 CS454/
21 Decimal Representation of Internet Addresses octet octet 2 octet 3 Network ID Host ID Class A: to 27 0 to to to 255 Network ID Host ID Class B: 28 to 9 0 to to to 255 Network ID Host ID Class C: 92 to to to 255 to 254 Multicast address Class D (multicast): 224 to to to 255 to 254 Range of addresses to to to to Class E (reserved): 240 to to to 255 to to From Coulouris, Dollimore and Kindberg, Distributed Systems: Concepts and Design, 3rd ed. Addison-Wesley Publishers 2000 CS454/
22 IP Packet Layout header IP address of source IP address of destination up to 64 kilobytes data From Coulouris, Dollimore and Kindberg, Distributed Systems: Concepts and Design, 3rd ed. Addison-Wesley Publishers 2000 CS454/
23 How to Transfer Data Through the Network Network is a mesh of interconnected routers Two ways of setting up a connection between two computers circuit switching: dedicated circuit per call: telephone net packet-switching: data sent thru net in discrete chunks CS454/
24 Circuit Switching End-end resources reserved for call link bandwidth, switch capacity dedicated resources: no sharing circuit-like (guaranteed) performance call setup required CS454/
25 Circuit Switching Network resources (e.g., bandwidth) divided into pieces pieces allocated to calls resource piece idle if not used by owning call (no sharing) dividing link bandwidth into pieces frequency division time division CS454/
26 Packet Switching each end-end data stream divided into packets user A, B packets share network resources each packet uses full link bandwidth resources used as needed resource contention: aggregate resource demand can exceed amount available congestion: packets queue, wait for link use store and forward: packets move one hop at a time transmit over link wait turn at next link CS454/
27 Packet Switching A 0 Mbs Ethernet statistical multiplexing C B queue of packets waiting for output link.5 Mbs D 45 Mbs E CS454/
28 Message Switching Message switching = Packet-switching without segmentation Packet switching: Store and Forward Message remains intact as it traverses the network Message 0 Message 5 Message 0 Message 5 Time (sec.) CS454/
29 Packet switching vs Circuit Switching Packet switching allows more users to use network! Mbit link; each user: 00Kbps when active active 0% of time circuit-switching: 0 users packet switching: 35 users, probability > 0 active less than.004 N users Mbps link CS454/
30 Packet Switching vs Circuit Switching (2) Packet switching is great for bursty data resource sharing no call setup It incurs excessive congestion: packet delay and loss protocols needed for reliable data transfer, congestion control How to provide circuit-like behavior? bandwidth guarantees needed for audio/video apps still an unsolved problem, but solutions such as ATM have been developed CS454/
31 Delays in Packet Switching Packets experience delay on end-toend path Sources of delay at each hop: Nodal processing check bit errors determine output link Queuing time waiting at output link for transmission; depends on congestion level of router Transmission delay R=link bandwidth (bps), L=packet length (bits) time to send bits into link = L/R Propagation delay d = length of physical link, s = propagation speed in medium (~2x0 8 m/sec) propagation delay = d/s A B transmission propagation nodal processing queueing CS454/
32 Routing Goal: move packets among routers from source to destination It is an issue in packet switched networks datagram network: destination address determines next hop routes may change during session analogy: driving, asking directions virtual circuit network: each packet carries tag (virtual circuit ID), tag determines next hop fixed path determined at call setup time, remains fixed thru call routers maintain per-call state CS454/
33 Routing in a Wide Area Network A B Hosts or local networks 3 D Links 6 E C Routers From Coulouris, Dollimore and Kindberg, Distributed Systems: Concepts and Design, 3rd ed. Addison-Wesley Publishers 2000 CS454/
34 CS454/ Routing Tables Routings from D Routings from E To Link Cost To Link Cost A B C D E local A B C D E local 2 0 Routings from A Routings from B Routings from C To Link Cost To Link Cost To Link Cost A B C D E local A B C D E local A B C D E 2 2 local From Coulouris, Dollimore and Kindberg, Distributed Systems: Concepts and Design, 3rd ed. Addison-Wesley Publishers 2000
35 Network Taxonomy telecommunication networks Circuit-switched networks Packet-switched networks FDM TDM Networks with VCs connectionoriented Datagram Networks connection-oriented & connectionless CS454/
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
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,
Operating Systems CS 571
Computer Networks: Overview Operating Systems CS 571 Network types Range Bandwidth (Mbps) Latency (ms) LAN 1-2 kms 10-1000 1-10 WAN worldwide 0.010-600 100-500 MAN 2-50 kms 1-150 10 Wireless LAN 0.15-1.5
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
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
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
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?
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
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
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?
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.
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
Lecture 2 Communication services The Trasport Layer. Antonio Cianfrani DIET Department Networking Group netlab.uniroma1.it
Lecture 2 Communication services The Trasport Layer Antonio Cianfrani DIET Department Networking Group netlab.uniroma1.it The structure edge: applications and hosts core: routers of s access s, media:
Slides for Chapter 3: Networking and Internetworking
Slides for Chapter 3: Networking and Internetworking From Coulouris, Dollimore, Kindberg and Blair Distributed Systems: Concepts and Design Edition 5, Addison-Wesley 202 Figure 3. Network performance km
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
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
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
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
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
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,
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
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
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
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
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
A closer look at network structure:
T1: Introduction 1.1 What is computer network? Examples of computer network The Internet Network structure: edge and core 1.2 Why computer networks 1.3 The way networks work 1.4 Performance metrics: Delay,
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
Goal and A sample Network App
Application Layer Goal and A sample Network App Write programs that run on different end systems and communicate over a network. e.g., Web: Web server software communicates with browser software Little
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
CS 3516: Advanced Computer Networks
Welcome to CS 3516: Advanced Computer Networks Prof. Yanhua Li Time: 9:00am 9:50am, T, R, and F Location: Fuller 320 Fall 2017 A-term 1 Some slides are originally from the course materials of the textbook
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
CS 640: Introduction to Computer Networks. Today s Lecture. Page 1
CS 640: Introduction to Computer Networks Aditya Akella Lecture 2 Layering, Protocol Stacks, and Standards 1 Today s Lecture Layers and Protocols A bit about s 2 Network Communication: Lots of Functions
Chapter 2 Communicating Over the Network
Chapter 2 Communicating Over the Network Elements of Communication Communicating the Messages Continuous stream of bits 00101010100101010101010101010101010 I have to wait Single communications (e.g. video,
CSC 4900 Computer Networks: End-to-End Design
CSC 4900 Computer Networks: End-to-End Design Professor Henry Carter Fall 2017 Villanova University Department of Computing Sciences Review In the last two lectures, we discussed the fundamentals of networking
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
Chapter 2 Application Layer. Lecture 4: principles of network applications. Computer Networking: A Top Down Approach
Chapter 2 Application Layer Lecture 4: principles of network applications Computer Networking: A Top Down Approach 6 th edition Jim Kurose, Keith Ross Addison-Wesley March 2012 Application Layer 2-1 Chapter
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,
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,
CMSC 322 Computer Networks Applications and End-To- End
CMSC 322 Computer Networks Applications and End-To- End Professor Doug Szajda CMSC 332: Computer Networks Announcements Project 2 has been posted and is due Monday, February 8 (No extension!) Homework
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
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
Lecture 7: Internetworking See Chapter 3 of Colouris
95-702 Distributed Systems Lecture 7: Internetworking See Chapter 3 of Colouris Learning Goals Preamble: MISM and MSIT grads may need to plan, develop, and manage distributed systems. These distributed
Computer Networking. Introduction. Quintin jean-noël Grenoble university
Computer Networking Introduction Quintin jean-noël Jean-noel.quintin@imag.fr Grenoble university Based on the presentation of Duda http://duda.imag.fr 1 Course organization Introduction Network and architecture
CS 428/528 Computer Networks Lecture 01. Yan Wang
1 CS 428/528 Computer Lecture 01 Yan Wang 2 Motivation: Why bother? Explosive growth of networks 1989, 100,000 hosts on the Internet Distributed Applications and Systems E-mail, WWW, multimedia, distributed
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
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
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
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
Review of Previous Lecture
Review of Previous Lecture Network access and physical media Internet structure and ISPs Delay & loss in packet-switched networks Protocol layers, service models Some slides are in courtesy of J. Kurose
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
Introduction to the Application Layer. Computer Networks Term B14
Introduction to the Application Layer Computer Networks Term B14 Intro to Application Layer Outline Current Application Layer Protocols Creating an Application Application Architectures Client-Server P2P
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:
CSCE 463/612 Networks and Distributed Processing Spring 2018
CSCE 463/612 Networks and Distributed Processing Spring 2018 Introduction Dmitri Loguinov Texas A&M University January 23, 2018 Original slides copyright 1996-2004 J.F Kurose and K.W. Ross 1 Updates Recv
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
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
Introduction and Layered Network Architecture. EEE 538 Dr. Nail Akar Bilkent University Electrical and Electronics Engineering Department
Introduction and Layered Network Architecture EEE 538 Dr. Nail Akar Bilkent University Electrical and Electronics Engineering Department 1 Fundamental Aspects of Network Analysis Architecture Layering
1. What is a Computer Network? interconnected collection of autonomous computers connected by a communication technology
Review Questions for exam Preparation (22-07-2017) 1. What is a Computer Network? interconnected collection of autonomous computers connected by a communication technology 2. What is the Internet? "network
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
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
JAMES F. KUROSE AND KEITH W. ROSS
JAMES F. KUROSE AND KEITH W. ROSS What is the internet? There is no one definition. Two ways to try to describe it: Nuts and bolts i.e. the basic hardware and software components A networking infrastructure
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
ECE 650 Systems Programming & Engineering. Spring 2018
ECE 650 Systems Programming & Engineering Spring 2018 Networking Introduction Tyler Bletsch Duke University Slides are adapted from Brian Rogers (Duke) Computer Networking A background of important areas
CS 5523 Operating Systems: Network
CS 5523 Operating Systems: Network Instructor: Dr. Tongping Liu Thank Dr. Dakai Zhu, Dr. Palden Lama for providing their slides. CS5523: Operating Systems @ UTSA 1 What are the Problems? A OS Tongping
Data Networks. Lecture 1: Introduction. September 4, 2008
Data Networks Lecture 1: Introduction September 4, 2008 Slide 1 Learning Objectives Fundamental aspects of network Design and Analysis: Architecture: layering, topology design, switching mechanisms Protocols:
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
CMPE 150/L : Introduction to Computer Networks. Chen Qian Computer Engineering UCSC Baskin Engineering Lecture 4
CMPE 150/L : Introduction to Computer Networks Chen Qian Computer Engineering UCSC Baskin Engineering Lecture 4 1 Lab schedule confirmation Mondays, 12:00-2:00pm Tuesdays, 11:00am-1:00pm Wednesdays, 4:00-6:00pm
Defining the Internet
Defining the Internet Daniel Zappala CS 460 Computer Communications and Networking Brigham Young University What is the Internet? 2/23 Internet Map, courtesy Barrett Lyon, 2003 What is the Internet? 3/23
Data and Computer Communications. Chapter 2 Protocol Architecture, TCP/IP, and Internet-Based Applications
Data and Computer Communications Chapter 2 Protocol Architecture, TCP/IP, and Internet-Based s 1 Need For Protocol Architecture data exchange can involve complex procedures better if task broken into subtasks
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
Client/Server Computing
CS 312 Internet Concepts Client/Server Computing Dr. Michele Weigle Department of Computer Science Old Dominion University mweigle@cs.odu.edu http://www.cs.odu.edu/~mweigle/cs312-f11 1 Applications and
Reti di Calcolatori I
Reti di Calcolatori I Prof. Roberto Canonico Dipartimento di Ingegneria Elettrica e delle Tecnologie dell Informazione Corso di Laurea in Ingegneria delle Telecomunicazioni Corso di Laurea in Ingegneria
Operating Systems. 16. Networking. Paul Krzyzanowski. Rutgers University. Spring /6/ Paul Krzyzanowski
Operating Systems 16. Networking Paul Krzyzanowski Rutgers University Spring 2015 1 Local Area Network (LAN) LAN = communications network Small area (building, set of buildings) Same, sometimes shared,
Need For Protocol Architecture
Chapter 2 CS420/520 Axel Krings Page 1 Need For Protocol Architecture E.g. File transfer Source must activate communications path or inform network of destination Source must check destination is prepared
Need For Protocol Architecture
Chapter 2 CS420/520 Axel Krings Page 1 Need For Protocol Architecture E.g. File transfer Source must activate communications path or inform network of destination Source must check destination is prepared
Packet-switching: store-and-forward
Packet-switching: store-and-forward L R R R Takes L/R seconds to transmit (push out) packet of L bits on to link or R bps Entire packet must arrive at router before it can be transmitted on next link:
Introduction to the Internet
Introduction to the Internet CCST9015 8 th Sep, 2010 Dr. Hayden Kwok-Hay So Department of Electrical and Electronic Engineering 2 Internet in 2003 3 Internet Basics The Internet is a network that connects
Data & Computer Communication
Basic Networking Concepts A network is a system of computers and other devices (such as printers and modems) that are connected in such a way that they can exchange data. A bridge is a device that connects
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
Computer Networks. ENGG st Semester, 2010 Hayden Kwok-Hay So
Computer Networks ENGG1015 1 st Semester, 2010 Hayden Kwok-Hay So Where are we in the semester? High Level Applications Systems Digital Logic Image & Video Processing Computer & Embedded Systems Computer
TCP/IP THE TCP/IP ARCHITECTURE
TCP/IP-1 The Internet Protocol (IP) enables communications across a vast and heterogeneous collection of networks that are based on different technologies. Any host computer that is connected to the Internet
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
Chapter 2 - Part 1. The TCP/IP Protocol: The Language of the Internet
Chapter 2 - Part 1 The TCP/IP Protocol: The Language of the Internet Protocols A protocol is a language or set of rules that two or more computers use to communicate 2 Protocol Analogy: Phone Call Parties
Data Communication & Computer Networks MCQ S
Data Communication & Computer Networks MCQ S 1. The translates internet domain and host names to IP address. a) domain name system b) routing information protocol c) network time protocol d) internet relay
Communicating over the Network
Communicating over the Network Network Fundamentals Chapter 2 Version 4.0 1 Network Structure The elements of communication 3 common elements of communication Message source people/electronic devices need
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
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
Course on Computer Communication and Networks. Lecture 1 Chapter 1: Introduction Part A: Internet, Protocol Layering and Data
Course on Computer Communication and Networks Lecture 1 Chapter 1: Introduction Part A: Internet, Protocol Layering and Data CTH EDA344/ GU DIT 420 Based on the book Computer Networking: A Top Down Approach,
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.
Network.... communication system for connecting end- systems. End-systems a.k.a. hosts PCs, workstations dedicated computers network components
Networking 1 Network... communication system for connecting end- systems End-systems a.k.a. hosts PCs, workstations dedicated computers network components 2 Multiaccess vs.. Point-to-point Multiaccess
Computer Communication & Networks / Data Communication & Computer Networks Week # 03
Computer Communication & Networks / Data Communication & Computer Networks Week # 03 M.Nadeem Akhtar CS & IT Department The University of Lahore Email: nadeem.akhtar@cs.uol.edu.pk URL-https://sites.google.com/site/nadeemuolcsccn/home
EEC-484/584 Computer Networks
EEC-484/584 Computer Networks Lecture 2 Wenbing Zhao wenbing@ieee.org (Lecture nodes are based on materials supplied by Dr. Louise Moser at UCSB and Prentice-Hall) Misc. Interested in research? Secure
CN1047 INTRODUCTION TO COMPUTER NETWORKING CHAPTER 6 OSI MODEL TRANSPORT LAYER
CN1047 INTRODUCTION TO COMPUTER NETWORKING CHAPTER 6 OSI MODEL TRANSPORT LAYER Transport Layer The Transport layer ensures the reliable arrival of messages and provides error checking mechanisms and data
Applied Computer Networks. Introduction (2 nd Edition) John Morton
Applied Computer Networks Introduction (2 nd Edition) John Morton Fred Halsall Some Books Computer Networking and the Internet 5 th Ed, Addison-Wesley, 2005. James Kurose and Keith Ross Computer Networking
Computer Networks. Andrew S. Tanenbaum
Computer Networks Third Edition Andrew S. Tanenbaum 1 ; l Vrije Universiteit Amsterdam, The Netherlands For book and bookstore information Prentice Hall PTR Upper Saddle River, New Jersey 07458 CONTENTS
CSEN 503 Introduction to Communication Networks. Mervat AbuElkheir Hana Medhat Ayman Dayf. ** Slides are attributed to J. F.
CSEN 503 Introduction to Communication Networks Mervat AbuElkheir Hana Medhat Ayman Dayf ** Slides are attributed to J. F. Kurose Chapter 3 outline Transport-layer services Multiplexing and demultiplexing
Switching Networks (Fall 2010) EE 586 Communication and. August 30, Lecture 3. (modified by Cheung for EE586; based on K&R original) 1-1
EE 586 Communication and Switching Networks (Fall 2010) Lecture 3 August 30, 2010 (modified by Cheung for EE586; based on K&R original) 1-1 Announcements Read Chapter 1 Homework Small revision of the Wireshark
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
Chapter 2. Application Layer. Chapter 2: Application Layer. Application layer - Overview. Some network apps. Creating a network appication
Mobile network Chapter 2 The Yanmin Zhu Department of Computer Science and Engineering Global ISP Home network Regional ISP Institutional network CSE Department 1 CSE Department 2 Application layer - Overview
Computer Networks & Security 2016/2017
Computer Networks & Security 2016/2017 Protocol Layering (02) Dr. Tanir Ozcelebi Courtesy: Kurose & Ross TU/e Computer Science Security and Embedded Networked Systems Your typical lunch Slide 2 What is
PLEASE READ CAREFULLY BEFORE YOU START
Page 1 of 11 MIDTERM EXAMINATION #1 OCT. 16, 2013 COMPUTER NETWORKS : 03-60-367-01 U N I V E R S I T Y O F W I N D S O R S C H O O L O F C O M P U T E R S C I E N C E Fall 2013-75 minutes This examination