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COMPUTER NETWORKS CS610 Lecture-35 Hammad Khalid Khan.

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Presentation on theme: "COMPUTER NETWORKS CS610 Lecture-35 Hammad Khalid Khan."— Presentation transcript:

1 COMPUTER NETWORKS CS610 Lecture-35 Hammad Khalid Khan

2 Review Lecture 34 The need for End –to-End Protocols
User Datagram Protocol Characteristics of UDP The Connectionless Paradigm Message-Oriented Interface UDP Communication Semantics Arbitrary Interaction Support for Multicast and Broadcast Endpoint Identification

3 UDP Datagram Format

4 UDP Encapsulation

5 TCP: Reliable Transport Service
Chapter 25 TCP: Reliable Transport Service

6 Introduction TCP: Major Transport Protocol in the TCP/IP suite
Uses unreliable datagram service offered by IP when sending data to another computer Provides reliable data delivery service to applications

7 The Need for Reliable Transport
Reliability is fundamental in a computer system Software in the internet must provide the same level of reliability as a computer system Software must guarantee prompt and reliable communication without any loss, duplication, and change in the order

8 Transmission Control Protocol
Reliability is the responsibility of the Transport Layer In TCP/IP, TCP provides reliable transport service Most internet applications use TCP as no other protocol has proved to work better

9 Service provided by TCP
Connection-Oriented service Point-to-point Complete Reliability Full-duplex communication Stream interface Reliable Connection Startup Graceful Connection Shutdown

10 End-to-End Service and Datagrams
Applications can request a connection TCP connections are called Virtual Connections Created by Software only Internet does not provide software or hardware support for the connections TCP software modules on two computers create an illusion of a connection

11 End-to-End Service and Datagrams
TCP uses IP to carry messages TCP message encapsulated in IP datagram and sent to the destination On the destination host, IP passes the contents to TCP

12 End-to-End Service and Datagrams

13 Achieving Reliability
The major problems in the reliable delivery are: Unreliable delivery by the underlying communication system System reboot

14 Summary UDP datagram Format UDP Encapsulation
TCP: Reliable Transport Service The Need For Reliable Transport Service Provided by TCP End-to-End Service and Datagrams Achieving Reliablility

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