Application Layer -1- Network Tools
|
|
- Iris Holmes
- 6 years ago
- Views:
Transcription
1 EITF25 Internet: Technology and Applications Application Layer -1- Network Tools 2013, Lecture 06 Kaan Bür, Stefan Höst
2 Previously on EITF25 Transport Layer Addressing above IP Ports, sockets Process-to-process delivery Transport layer protocols TCP UDP Quality of Service 2
3 Today: Application Layer (1) Domain Name System, DNS [Forouzan ed.5 ch.26.6] Host Configuration, DHCP [Forouzan ed.5 ch ] Debugging Tools, ICMP [Forouzan ed.5 ch.19.2] World-Wide Web, HTTP [Forouzan ed.5 ch.26.1] *[Kihl & Andersson: 7.5, 7.7, 7.9, 12.4] 3
4 Mapping host name to IP address Application protocols use host names TCP/IP protocol suite uses IP addresses Mapping from host name to IP addresses Domain Name System (DNS) Domain name space Domain name resolution
5 Domain Name System (DNS) Internet s telephone book: Address name One of the most important systems on the Internet 5
6 Domain name space Names must be unique Complete control needed 6
7 Domain names and labels 7
8 Internet domains 8
9 Generic domains 9
10 Country domains se lth eit eit.lth.se 10
11 Hierarchy of domain name servers 13 logical root name servers implemented by 376 physic al servers 11
12 Domains, subdomains, zones Domain Subtree of DNS Zone Servers control area 12
13 Domain name resolution Action of address mapping Client = resolver Server = DNS One server cannot have all the answers! How to ask others? What to do with the answer? Caching Remember what you ve learned! 13
14 Recursive resolution 14
15 Iterative resolution 15
16 Domain name to IP address (1) troll.trollnet.se magi.magicnet.se 1. magi.magicnet.se? ns.trollnet.se 16
17 Domain name to IP address (2) troll.trollnet.se magi.magicnet.se 2. magicnet.se? ns.trollnet.se Ask ns.magicnet.se x.ns.se
18 Domain name to IP address (3) troll.trollnet.se magi.magicnet.se 6. IP = magi.magicnet.se? 5. IP = ns.trollnet.se ns.magicnet.se 18
19 Domain name to IP address (4) troll.trollnet.se magi.magicnet.se 7. IP =
20 Exercise: Break this vicious cycle! DHCP IP addr. IP DNS TCP UDP 20
21 Obtaining an IP address Dynamic Host Configuration Protocol Application layer DHCP IP address Allocation from pool or static Network mask Default gateway DNS server(s) 21
22 DHCP operation 22
23 DHCP states 75% 23
24 See you in 15 :) After the break Network debugging ICMP World-wide web 24
25 Debugging Tools Applications used for debugging Two examples Ping Traceroute 25
26 Ping 26
27 Traceroute 27
28 Internet Control Message Protocol ICMP Support protocol for IP Error reporting Query 28
29 Encapsulation ICMP messages encapsulated in IP packets 29
30 ICMP message formats Error reporting Query messages 30
31 ICMPv4 message types 31
32 Redirection (error reporting type) Routing update for hosts More efficient when too many hosts DEFAULT ROUTER 32
33 Exercise: ICMP in action Q: In what kind of network can a host never receive a redirection message? A: In a network with only one router 33
34 Echo request and reply (query type) Is my destination alive? Network diagnostics IP layer Debugging tools Ping Traceroute 34
35 Traceroute Used to trace a packet s route from source to destination Uses three ICMP messages Echo Request (query) Time Exceeded (error) Destination Unreachable (error) Manipulates TTL field in IP header Uses wrong port number 35
36 Traceroute Echo request 36
37 Application layer paradigms Client-server paradigm WWW, Online games, Web TV, Facebook Peer-to-peer paradigm BitTorrent, Voddler, Skype Some applications use both paradigms Spotify
38 Client-server paradigm
39 Peer-to-peer paradigm 39
40 Application: WWW The idea of the World-Wide Web (WWW) was first proposed by Tim Berners-Lee in 1989 at CERN, the European Organization for Nuclear Research The purpose was to allow all CERN researchers at different locations throughout Europe to access each others results The commercial Web started in 1993.
41 Components of WWW Web documents (pages) HyperTextMarkup Language (HTML) for static web pages Script languages (PHP, ASP, JSP, CGI etc.) for dynamic Universal Resource Locator (URL) Standard way to identify location of web documents HyperText Transfer Protocol (HTTP) Protocol to access documents on a web server
42 Universal Resource Locator (URL) A web document has four identifiers Protocol, Host, Port and Path. A URL is defined as protocol://host:port/path Standard HTTP port 80 is is omitted
43 Hypertext Transfer Protocol (HTTP) Text-based protocol Two basic types of messages Requests and Responses Sets up and uses a TCP connection
44 Document retrieval 44
45 Operation of HTTP 1.1 Persistent connection Only one TCP session for all requests from the same server. 45
46 HTTP request and response format
47 HTTP methods in requests Using these methods, clients may request corresponding actions from server. 47
48 Example request and response 48
49 Cookies Original WWW was stateless Each request/response treated separately No history of previous messages Cookies store information about client introduce concept of a user session Implementation (creation and storage) of cookies can be different, but same concept
50 Cookies 50
51 Summary: Application Layer (1) Domain Name System Mapping host names to IP addresses Host configuration Obtaining an IP address Debugging tools Ping, traceroute, ICMP Client-server vs. P2P applications www, http, cookies 51
EITF25 Internet- - Techniques and Applica8ons Stefan Höst. L9 Applica8on layer
EITF25 Internet- - Techniques and Applica8ons Stefan Höst L9 Applica8on layer Client- server paradigm E.g. www, IPTV, OTT, Online games, etc 2 Peer- to- peer paradigm E.g. BitTorrent, Voddler, Skype, etc
More informationETSF10 Internet Protocols Network Layer Protocols
ETSF10 Internet Protocols Network Layer Protocols 2012, Part 2, Lecture 3.1 Kaan Bür, Jens Andersson Network Layer Protocols IPv4, IPv6 [ed.4 ch.20.3+19.2] [ed.5 ch.22.1.1-2+22.2] Transition from IPv4
More informationICS 351: Networking Protocols
ICS 351: Networking Protocols IP packet forwarding application layer: DNS, HTTP transport layer: TCP and UDP network layer: IP, ICMP, ARP data-link layer: Ethernet, WiFi 1 Networking concepts each protocol
More informationComputer Networks. More on Standards & Protocols Quality of Service. Week 10. College of Information Science and Engineering Ritsumeikan University
Computer Networks More on Standards & Protocols Quality of Service Week 10 College of Information Science and Engineering Ritsumeikan University Introduction to Protocols l A protocol is a set of rules
More informationEEC-682/782 Computer Networks I
EEC-682/782 Computer Networks I Lecture 20 Wenbing Zhao w.zhao1@csuohio.edu http://academic.csuohio.edu/zhao_w/teaching/eec682.htm (Lecture nodes are based on materials supplied by Dr. Louise Moser at
More informationCS 457 Lecture 11 More IP Networking. Fall 2011
CS 457 Lecture 11 More IP Networking Fall 2011 IP datagram format IP protocol version number header length (bytes) type of data max number remaining hops (decremented at each router) upper layer protocol
More informationOutline. SC/CSE 3213 Winter Sebastian Magierowski York University. ICMP ARP DHCP NAT (not a control protocol) L9: Control Protocols
SC/CSE 3213 Winter 2013 L9: Control Protocols Sebastian Magierowski York University 1 Outline ICMP ARP DHCP NAT (not a control protocol) 2 1 Control Protocols IP is used to transfer data Network layer
More informationChapter 2. Application Layer
Chapter 2 Application Layer 2.1. 2-1 INTRODUCTION - The application layer provides services to the user - Communication is provided using a logical connection means that the two application layers assume
More informationOn Distributed Communications, Rand Report RM-3420-PR, Paul Baran, August 1964
The requirements for a future all-digital-data distributed network which provides common user service for a wide range of users having different requirements is considered. The use of a standard format
More informationETSF10 Internet Protocols Routing on the Internet
ETSF10 Internet Protocols Routing on the Internet 2012, Part 2, Lecture 1.2 Kaan Bür, Jens Andersson Routing on the Internet Unicast routing protocols (part 2) [ed.4 ch.22.4] [ed.5 ch.20.3] Forwarding
More informationObjectives. Connecting with Computer Science 2
Objectives Learn what the Internet really is Become familiar with the architecture of the Internet Become familiar with Internet-related protocols Understand how the TCP/IP protocols relate to the Internet
More informationICS 451: Today's plan
ICS 451: Today's plan ICMP ping traceroute ARP DHCP summary of IP processing ICMP Internet Control Message Protocol, 2 functions: error reporting (never sent in response to ICMP error packets) network
More informationTCP/IP Networking. Training Details. About Training. About Training. What You'll Learn. Training Time : 9 Hours. Capacity : 12
TCP/IP Networking Training Details Training Time : 9 Hours Capacity : 12 Prerequisites : There are no prerequisites for this course. About Training About Training TCP/IP is the globally accepted group
More informationReview of Important Networking Concepts
Review of Important Networking Concepts Review: ed communication architecture The TCP/IP protocol suite 1 Networking Concepts Protocol Architecture Protocol s Encapsulation Network Abstractions 2 1 Sending
More information0 0& Basic Background. Now let s get into how things really work!
+,&&-# Department of Electrical Engineering and Computer Sciences University of California Berkeley Basic Background General Overview of different kinds of networks General Design Principles Architecture
More informationSC/CSE 3213 Winter Sebastian Magierowski York University CSE 3213, W13 L8: TCP/IP. Outline. Forwarding over network and data link layers
SC/CSE 3213 Winter 2013 L8: TCP/IP Overview Sebastian Magierowski York University 1 Outline TCP/IP Reference Model A set of protocols for internetworking The basis of the modern IP Datagram Exchange Examples
More information6. Correspondence relationship between Educational goals and Course goals
1. Course Title (Course Code) Fundamentals of Information Networks (2201) 2. Instructor Teruaki YOKOYAMA 3. Term Fall 2 4. Outline and Objectives In this course the students study the technologies for
More informationInternet applications
CSc 450/550 Computer Networks Worldwide Web Jianping Pan Summer 2006 5/18/06 CSc 450/550 1 Traditionally Internet applications remote login: e.g., telnet file transfer: e.g., FTP electronic mail: e.g.,
More informationETSF05/ETSF10 Internet Protocols Network Layer Protocols
ETSF05/ETSF10 Internet Protocols Network Layer Protocols 2016 Jens Andersson Agenda Internetworking IPv4/IPv6 Framentation/Reassembly ICMPv4/ICMPv6 IPv4 to IPv6 transition VPN/Ipsec NAT (Network Address
More informationNetwork Layer (4): ICMP
1 Network Layer (4): ICMP Required reading: Kurose 4.4.3, 4.4.4 CSE 4213, Fall 2006 Instructor: N. Vlajic 2 1. Introduction 2. Network Service Models 3. Architecture 4. Network Layer Protocols in the Internet
More informationWeb Engineering (CC 552)
Web Engineering (CC 552) Introduction Dr. Mohamed Magdy mohamedmagdy@gmail.com Room 405 (CCIT) Course Goals n A general understanding of the fundamentals of the Internet programming n Knowledge and experience
More informationInternet Control Message Protocol (ICMP)
Internet Control Message Protocol (ICMP) 1 Overview The IP (Internet Protocol) relies on several other protocols to perform necessary control and routing functions: Control functions (ICMP) Multicast signaling
More informationEECS 122: Introduction to Computer Networks DNS and WWW. Internet Names & Addresses
EECS 122: Introduction to Computer Networks DNS and WWW Computer Science Division Department of Electrical Engineering and Computer Sciences University of California, Berkeley Berkeley, CA 94720-1776 Internet
More informationCh.9 Internet Protocol: Error And Control Messages (ICMP)
CSC521 Communication Protocols 網路通訊協定 Ch.9 Internet Protocol: Error And Control Messages (ICMP) 吳俊興國立高雄大學資訊工程學系 Internetworking With TCP/IP, Vol I: Sixth Edition, Douglas E. Comer Outline 1 Introduction
More informationCCNA Exploration Network Fundamentals. Chapter 06 Addressing the Network IPv4
CCNA Exploration Network Fundamentals Chapter 06 Addressing the Network IPv4 Updated: 20/05/2008 1 6.0.1 Introduction Addressing is a key function of Network layer protocols that enables data communication
More informationSingle Network: applications, client and server hosts, switches, access links, trunk links, frames, path. Review of TCP/IP Internetworking
1 Review of TCP/IP working Single Network: applications, client and server hosts, switches, access links, trunk links, frames, path Frame Path Chapter 3 Client Host Trunk Link Server Host Panko, Corporate
More informationGuide to Networking Essentials, 6 th Edition. Chapter 5: Network Protocols
Guide to Networking Essentials, 6 th Edition Chapter 5: Network Protocols Objectives Describe the purpose of a network protocol, the layers in the TCP/IP architecture, and the protocols in each TCP/IP
More informationCSCD 433/533 Advanced Networks
CSCD 433/533 Advanced Networks Lecture 2 Network Review Winter 2017 Reading: Chapter 1 1 Topics Network Topics Some Review from CSCD330 Applications Common Services Architecture OSI Model AS and Routing
More informationUnit 28 Website Production ASSIGNMENT 1
Unit 28 Website Production ASSIGNMENT 1 Last week Learning outcomes History HTML skeleton Annotated diagram of a WAN Servers, routers, client PC, browser, Server OS Switch, packet Architecture ISP Web
More informationHigher layer protocols
ETSF05/ETSF10 Internet Protocols Higher layer protocols DHCP DNS Real time applications RTP The hen or the egg? DHCP IP addr. IP DNS TCP UDP ETSF05/ETSF10 - Internet Protocols 2 What to configure IP address
More informationTSIN02 - Internetworking
Lecture 2: Internet Protocol Literature: Forouzan: ch (4-6), 7-9 and ch 31 2004 Image Coding Group, Linköpings Universitet Lecture 2: IP Goals: Understand the benefits Understand the architecture IPv4
More informationFachgebiet Technische Informatik, Joachim Zumbrägel
Computer Network Lab 2017 Fachgebiet Technische Informatik, Joachim Zumbrägel Overview Internet Internet Protocols Fundamentals about HTTP Communication HTTP-Server, mode of operation Static/Dynamic Webpages
More informationChapter 10: Application Layer CCENT Routing and Switching Introduction to Networks v6.0
Chapter 10: Application Layer CCENT Routing and Switching Introduction to Networks v6.0 CCNET v6 10 Chapter 10 - Sections & Objectives 10.1 Application Layer Protocols Explain the operation of the application
More informationNetwork layer: Overview. Network layer functions IP Routing and forwarding NAT ARP IPv6 Routing
Network layer: Overview Network layer functions IP Routing and forwarding NAT ARP IPv6 Routing 1 Network Layer Functions Transport packet from sending to receiving hosts Network layer protocols in every
More informationUse of the TCP/IP Protocols and the OSI Model in Packet Tracer
Communication Networks [Netw501] Spring 2018 Tutorial 3 Packet Tracer Activity 3 Use of the TCP/IP Protocols and the OSI Model in Packet Tracer Introduction: In Packet Tracer simulation mode, detailed
More informationTable of Contents 1 System Maintaining and Debugging 1-1
Table of Contents 1 System Maintaining and Debugging 1-1 System Maintaining and Debugging 1-1 Ping 1-1 Introduction 1-1 Configuring Ping 1-1 Ping Configuration Example 1-2 Tracert 1-4 Introduction 1-4
More informationLecture 8. Basic Internetworking (IP) Outline. Basic Internetworking (IP) Basic Internetworking (IP) Service Model
Lecture 8 Basic Internetworking (IP) Reminder: Homework 3, Programming Project 2 due on Tuesday. An example internet is shown at right. Routers or gateways are used to connect different physical networks.
More informationNetwork layer: Overview. Network Layer Functions
Network layer: Overview Network layer functions IP Routing and forwarding NAT ARP IPv6 Routing 1 Network Layer Functions Transport packet from sending to receiving hosts Network layer protocols in every
More informationInternet Layers. Physical Layer. Application. Application. Transport. Transport. Network. Network. Network. Network. Link. Link. Link.
Internet Layers Application Application Transport Transport Network Network Network Network Link Link Link Link Ethernet Fiber Optics Physical Layer Wi-Fi ARP requests and responses IP: 192.168.1.1 MAC:
More informationICMP (Internet Control Message Protocol)
ABSTRACT : ICMP stands for internet control message protocol it is a vital protocol of network layer among the seven layers of OSI(open system interconnection). Here we deal with the several situations
More informationDifferent Layers Lecture 20
Different Layers Lecture 20 10/15/2003 Jian Ren 1 The Network Layer 10/15/2003 Jian Ren 2 Network Layer Functions Transport packet from sending to receiving hosts Network layer protocols in every host,
More informationLecture 8. Reminder: Homework 3, Programming Project 2 due on Thursday. Questions? Tuesday, September 20 CS 475 Networks - Lecture 8 1
Lecture 8 Reminder: Homework 3, Programming Project 2 due on Thursday. Questions? Tuesday, September 20 CS 475 Networks - Lecture 8 1 Outline Chapter 3 - Internetworking 3.1 Switching and Bridging 3.2
More informationEE 122: HyperText Transfer Protocol (HTTP)
Background EE 122: HyperText Transfer Protocol (HTTP) Ion Stoica Nov 25, 2002 World Wide Web (WWW): a set of cooperating clients and servers that communicate through HTTP HTTP history - First HTTP implementation
More informationCS475 Networks Lecture 8 Chapter 3 Internetworking. Ethernet or Wi-Fi).
Assignments Reading for Lecture 9: Section 3.3 3.2 Basic Internetworking (IP) Bridges and LAN switches from last section have limited ability CS475 Networks Lecture 8 Chapter 3 Internetworking is a logical
More informationNetwork Security. Introduction to networks. Radboud University, The Netherlands. Autumn 2015
Network Security Introduction to networks Radboud University, The Netherlands Autumn 2015 What is a (computer) network Definition A computer network is two or more computers that are connected, so that
More informationCCNA Exploration Network Fundamentals. Chapter 3 Application Layer Functionality and Protocols
CCNA Exploration Network Fundamentals Chapter 3 Application Layer Functionality and Protocols Application Layer Functionality and Protocols Applications: The Interface Between the Networks Horny/Coufal
More informationApplication Layer: OSI and TCP/IP Models
Application Layer Application Layer: OSI and TCP/IP Models The communication process between two communicating nodes is actually a communication process between two applications on these devices. Service
More informationOutline. Addressing on the network layer ICMP IPv6 Addressing on the link layer Virtual circuits
Lecture 2 Outline Addressing on the network layer ICMP IPv6 Addressing on the link layer Virtual circuits TCP/IP protocol suite Good name for our book! User application, e.g., http with Mozilla Communication
More informationApplication Layer Protocols
Application Layer Protocols Dr. Ihsan Ullah Department of Computer Science & IT University of Balochistan, Quetta Pakistan Email: ihsan.ullah.cs@gmail.com These slides are adapted from the slides accompanying
More informationETSF10 Internet Protocols Transport Layer Protocols
ETSF10 Internet Protocols Transport Layer Protocols 2012, Part 2, Lecture 2.1 Kaan Bür, Jens Andersson Transport Layer Protocols Process-to-process delivery [ed.4 ch.23.1] [ed.5 ch.24.1] Transmission Control
More informationFirewall Stateful Inspection of ICMP
The feature categorizes Internet Control Management Protocol Version 4 (ICMPv4) messages as either malicious or benign. The firewall uses stateful inspection to trust benign ICMPv4 messages that are generated
More informationTable of Contents. 1 Intrusion Detection Statistics 1-1 Overview 1-1 Displaying Intrusion Detection Statistics 1-1
Table of Contents 1 Intrusion Detection Statistics 1-1 Overview 1-1 Displaying Intrusion Detection Statistics 1-1 i 1 Intrusion Detection Statistics Overview Intrusion detection is an important network
More informationChapter 2 Applications and Layered Architectures
Chapter 2 Applications and ed Architectures Protocols, Services & ing OSI Reference Model TCP/IP Architecture How the s Work Together Berkeley Sockets Application Protocols & Utilities Chapter 2 Applications
More informationWeb as a Distributed System
Web as a Distributed System The World Wide Web is a large distributed system. In 1998 comprises 70-75% of Internet traffic. With large transfers of streaming media and p2p, no longer a majority of bytes,
More informationProtocol Classification
DNS and DHCP TCP/IP Suite Suite of protocols (not just TCP and IP) Main protocols TCP and UDP at the Transport Layer, and IP at the Network Layer Other protocols ICMP, ARP, Telnet, Ftp, HTTP, SMTP, SNMP
More informationIntroduction to Computer Networks. CS 166: Introduction to Computer Systems Security
Introduction to Computer Networks CS 166: Introduction to Computer Systems Security Network Communication Communication in modern networks is characterized by the following fundamental principles Packet
More informationCCNA R&S: Introduction to Networks. Chapter 10: The Application Layer
CCNA R&S: Introduction to Networks Chapter 10: The Application Layer Frank Schneemann 10.0.1.1 Introduction 10.0.1.2 Activity - Application Investigation 10.1.1.1 OSI and TCP/IP Models Revisited The application
More informationProblems of IP. Unreliable connectionless service. Cannot acquire status information from routers and other hosts
Chapter 09 ICMP Problems of IP Unreliable connectionless service Best effort service IP datagrams are discarded If destination is not found If TTL becomes 0 If reassembly timer expires Cannot acquire status
More informationNetwork Layer: DHCP, ICMP, NAT, IPv6
Network Layer:, ICMP, NAT, IPv6 CS 352, Lecture 11 http://www.cs.rutgers.edu/~sn624/352-s19 Srinivas Narayana (heavily adapted from slides by Prof. Badri Nath and the textbook authors) 1 IP addresses:
More information1/18/13. Network+ Guide to Networks 5 th Edition. Objectives. Chapter 10 In-Depth TCP/IP Networking
Network+ Guide to Networks 5 th Edition Chapter 10 In-Depth TCP/IP Networking Objectives Understand methods of network design unique to TCP/IP networks, including subnetting, CIDR, and address translation
More informationInternet Control Message Protocol (ICMP)
Chapter 9 Internet Control Message Protocol (ICMP) مترجم : دکتر محمد حسین یغمایی 1 TCP/IP Protocol Suite CONTENTS TYPES OF MESSAGES MESSAGE FORMAT ERROR REPORTING QUERY CHECKSUM ICMP PACKAGE مترجم : دکتر
More informationTSIN02 - Internetworking
Lecture 2: The Internet Protocol Literature: Forouzan: ch 4-9 and ch 27 2004 Image Coding Group, Linköpings Universitet Outline About the network layer Tasks Addressing Routing Protocols 2 Tasks of the
More informationCSCI-1680 WWW Rodrigo Fonseca
CSCI-1680 WWW Rodrigo Fonseca Based partly on lecture notes by Sco2 Shenker and John Janno6 Administrivia HW3 out today Will cover HTTP, DNS, TCP TCP Milestone II coming up on Monday Make sure you sign
More informationLecture 3. The Network Layer (cont d) Network Layer 1-1
Lecture 3 The Network Layer (cont d) Network Layer 1-1 Agenda The Network Layer (cont d) What is inside a router? Internet Protocol (IP) IPv4 fragmentation and addressing IP Address Classes and Subnets
More informationConnecting with Computer Science Chapter 5 Review: Chapter Summary:
Chapter Summary: The Internet has revolutionized the world. The internet is just a giant collection of: WANs and LANs. The internet is not owned by any single person or entity. You connect to the Internet
More informationComputer Network 2015 Mid-Term Exam.
Computer Network 2015 Mid-Term Exam. Question : ``Basic of Computer Networks and the Internet' Please fill into the blanks (15%) a) The amount of time required to push all of a packet s bits into a link
More informationBSc. (Hons) Web Technologies. Examinations for 2017 / Semester 1
BSc. (Hons) Web Technologies Cohort: BWT/17A/FT Examinations for 2017 / Semester 1 MODULE: NETWORK ESSENTIALS MODULE CODE: CAN 1104C Duration: 2 ½ hours Instructions to Candidates: 1. Answer ALL 4 (four)
More informationLecture 18 Overview. Last Lecture. This Lecture. Next Lecture. Internet Protocol (1) Internet Protocol (2)
Last Lecture Internet Protocol (1) This Lecture Internet Protocol (2) Lecture 18 Overview Source: chapters 19.1, 19.2, 22,1 22.2, 26.6 Next Lecture Transport Control Protocol (1) Source: chapters 24.1,
More informationUser Datagram Protocol(UDP)
User Datagram Protocol(UDP) UDP is a connectionless protocol. There is no mechanism for ensuring that data sent is received by the destination. Hence, it is an unreliable protocol. A unit of data sent
More informationApplication Level Protocols
Application Level Protocols 2 Application Level Protocols Applications handle different kinds of content e.g.. e-mail, web pages, voice Different types of content require different kinds of protocols Application
More informationCSE 565 Computer Security Fall 2018
CSE 565 Computer Security Fall 2018 Lecture 18: Network Attacks Department of Computer Science and Engineering University at Buffalo 1 Lecture Overview Network attacks denial-of-service (DoS) attacks SYN
More informationComputer Networks Security: intro. CS Computer Systems Security
Computer Networks Security: intro CS 166 - Computer Systems Security A very easy network 3/14/16 Computer Networks: Intro 2 Two philosophers example Translator Language Translator Engineer Communication
More informationETSF10 Internet Protocols Routing on the Internet
ETSF10 Internet Protocols Routing on the Internet 2013, Part 2, Lecture 1.2 Jens Andersson (Kaan Bür) Routing on the Internet Unicast routing protocols (part 2) [ed.5 ch.20.3] Multicast routing, IGMP [ed.5
More informationThe Application Layer: Sockets, DNS
The Application Layer: Sockets, DNS CS 352, Lecture 3 http://www.cs.rutgers.edu/~sn624/352-s19 Srinivas Narayana 1 App-layer protocol Types of messages exchanged, e.g., request, response Message format:
More informationChapter 10: Application Layer
Chapter 10: Application Layer Application, Session and Presentation Presentation and Session Layers Session layer Functions, creates, and maintains dialogs between source and destination applications Handles
More informationCommunication Networks ( ) / Fall 2013 The Blavatnik School of Computer Science, Tel-Aviv University. Allon Wagner
Communication Networks (0368-3030) / Fall 2013 The Blavatnik School of Computer Science, Tel-Aviv University Allon Wagner Kurose & Ross, Chapter 4 (5 th ed.) Many slides adapted from: J. Kurose & K. Ross
More informationPaper solution Subject: Computer Networks (TE Computer pattern) Marks : 30 Date: 5/2/2015
Paper solution Subject: Computer Networks (TE Computer- 2012 pattern) Marks : 30 Date: 5/2/2015 Q1 a) What is difference between persistent and non persistent HTTP? Also Explain HTTP message format. [6]
More informationComputer Networking Introduction
Computer Networking Introduction Halgurd S. Maghdid Software Engineering Department Koya University-Koya, Kurdistan-Iraq Lecture No.13 Chapter 4: outline 4.1 introduction 4.2 virtual circuit and datagram
More informationUsing ICMP to Troubleshoot TCP/IP Networks
Laura Chappell Using ICMP to Troubleshoot TCP/IP Networks Illustration: Norman Felchle Editor s Note: This article is based on Laura Chappell s upcoming book TCP/IP Analysis and Troubleshooting, which
More informationConfiguring Routes on the ACE
CHAPTER2 This chapter describes how the ACE is considered a router hop in the network when it is in routed mode. In the Admin or user contexts, the ACE supports static routes only. The ACE supports up
More informationTCP/IP Overview. Basic Networking Concepts. 09/14/11 Basic TCP/IP Networking 1
TCP/IP Overview Basic Networking Concepts 09/14/11 Basic TCP/IP Networking 1 What is TCP/IP? TCP/IP is a name refers to an entire collection of data communication protocols: TCP: Transmission Control Protocol
More informationCSCI-1680 WWW Rodrigo Fonseca
CSCI-1680 WWW Rodrigo Fonseca Based partly on lecture notes by Scott Shenker and John Jannotti Precursors 1945, Vannevar Bush, Memex: a device in which an individual stores all his books, records, and
More informationData 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
More informationLayer 4: UDP, TCP, and others. based on Chapter 9 of CompTIA Network+ Exam Guide, 4th ed., Mike Meyers
Layer 4: UDP, TCP, and others based on Chapter 9 of CompTIA Network+ Exam Guide, 4th ed., Mike Meyers Concepts application set transport set High-level, "Application Set" protocols deal only with how handled
More informationCSCI 466 Midterm Networks Fall 2013
CSCI 466 Midterm Networks Fall 2013 Name: This exam consists of 6 problems on the following 7 pages. You may use your single-sided hand-written 8 ½ x 11 note sheet and a calculator during the exam. No
More informationTransport: How Applications Communicate
Transport: How Applications Communicate Week 2 Philip Levis 1 7 Layers (or 4) 7. 6. 5. 4. 3. 2. 1. Application Presentation Session Transport Network Link Physical segments packets frames bits/bytes Application
More informationCPSC 826 Internetworking. The Network Layer: Routing & Addressing Outline. The Network Layer
1 CPSC 826 Intering The Network Layer: Routing & Addressing Outline The Network Layer Michele Weigle Department of Computer Science Clemson University mweigle@cs.clemson.edu November 10, 2004 Network layer
More informationInternet Technology 3/2/2016
Question 1 Defend or contradict this statement: for maximum efficiency, at the expense of reliability, an application should bypass TCP or UDP and use IP directly for communication. Internet Technology
More information06/02/ Local & Metropolitan Area Networks 0. INTRODUCTION. 1. History and Future of TCP/IP ACOE322
1 Local & Metropolitan Area Networks ACOE322 Lecture 5 TCP/IP Protocol suite and IP addressing 1 0. INTRODUCTION We shall cover in this topic: 1. The relation of TCP/IP with internet and OSI model 2. Internet
More informationTable of Contents 1 System Maintenance and Debugging Commands 1-1
Table of Contents 1 System Maintenance and Debugging Commands 1-1 System Maintenance Commands 1-1 ping 1-1 ping ipv6 1-5 tracert 1-6 tracert ipv6 1-7 System Debugging Commands 1-8 debugging 1-8 display
More information(ICMP), RFC
Internet et Control o Message Protocol (ICMP), RFC 792 http://icourse.cuc.edu.cn/networkprogramming/ linwei@cuc.edu.cn Nov. 2009 Overview The IP (Internet Protocol) relies on several other protocols to
More informationCCNA Exploration1 Chapter 3: Application Layer Functionality and Protocols
CCNA Exploration1 Chapter 3: Application Layer Functionality and Protocols LOCAL CISCO ACADEMY ELSYS TU INSTRUCTOR: STELA STEFANOVA 1 Objectives Functions of the three upper OSI model layers, network services
More informationCSE 3214: Computer Network Protocols and Applications. Midterm Examination
Department of Computer Science and Engineering CSE 3214: Computer Network Protocols and Applications Midterm Examination Instructions: Instructor: Peter Lian Date: February 14, 2013 1. Examination time:
More informationEITF25 Internet Techniques and Applications L7: Internet. Stefan Höst
EITF25 Internet Techniques and Applications L7: Internet Stefan Höst What is Internet? Internet consists of a number of networks that exchange data according to traffic agreements. All networks in Internet
More informationTCP/IP Protocol Suite
TCP/IP Protocol Suite Computer Networks Lecture 5 http://goo.gl/pze5o8 TCP/IP Network protocols used in the Internet also used in today's intranets TCP layer 4 protocol Together with UDP IP - layer 3 protocol
More informationSet of IP routers. Set of IP routers. Set of IP routers. Set of IP routers
Smart Sensor Application Sensor Framework Source End IP Address Set of IP routers IoT Application Layer TCP/IP Appl. Protocols Transport Layer TCP/IP IoT Comm. Framework Application Framework IoT Comm.
More informationComputer Communication - an introduction. Maria Kihl
Computer Communication - an introduction Maria Kihl Reading directives Forouzan 4th ed.: Chapter 1, Introductions of Chapters 26 and 27. Forouzan 5th ed: Chapter 1, 25.1, Introductions of 26.1-4 Kihl:
More informationMESSAGES error-reporting messages and query messages. problems processes IP packet specific information
ICMP ICMP ICMP is mainly used by operating systems of networked computers to send error messages indicating that a requested service is not available or that host/ router could not be reached. ICMP MESSAGES
More informationWEB TECHNOLOGIES CHAPTER 1
WEB TECHNOLOGIES CHAPTER 1 WEB ESSENTIALS: CLIENTS, SERVERS, AND COMMUNICATION Modified by Ahmed Sallam Based on original slides by Jeffrey C. Jackson THE INTERNET Technical origin: ARPANET (late 1960
More informationInterconnecting Networks with TCP/IP. 2000, Cisco Systems, Inc. 8-1
Interconnecting Networks with TCP/IP 2000, Cisco Systems, Inc. 8-1 Objectives Upon completion of this chapter you will be able to perform the following tasks: Identify the IP protocol stack, its protocol
More information