Chapter 3 Transport Layer Chapter 3 outline

Chapter 3: Transport Layer

Chapter 3 outline

Transport services and protocols

Transport vs. network layer

Internet transport-layer protocols

Chapter 3 outline

Multiplexing/demultiplexing use header info to deliver received segments to correct socket

Connectionless demultiplexing

Connectionless demux: example

Connection-oriented demux

Chapter 3 outline

UDP checksum

Internet checksum: example

Chapter 3 outline

Principles of reliable data transfer

Principles of reliable data transfer

Principles of reliable data transfer

send side receive side

sender receiver

rdt 2. 0: channel with bit errors

rdt 2. 0: channel with bit errors

receiver sender

rdt 2. 0 has a fatal flaw!

rdt 2. 1: discussion

rdt 3. 0 in action

=

Pipelined protocols: overview

Go-Back-N: sender

GBN: receiver extended FSM

Selective repeat

Chapter 3 outline

TCP seq. numbers, ACKs

TCP round trip time, timeout

TCP round trip time, timeout

TCP round trip time, timeout

Chapter 3 outline

TCP reliable data transfer

TCP sender events:

TCP fast retransmit

TCP fast retransmit X

Chapter 3 outline

TCP flow control

TCP flow control

Chapter 3 outline

2 -way handshake:

2 -way handshake failure scenarios:

TCP: closing a connection

TCP: closing a connection

Chapter 3 outline

Chapter 3 outline

TCP Congestion Control: details rate

TCP Slow Start

TCP: detecting, reacting to loss

TCP throughput

TCP throughput = 1. 22 MSS RTT L

TCP Fairness

Why is TCP fair?

Fairness (more)

Chapter 3: summary