ch3 networking

▪provide logical communication between application processes running on different hosts

• application layer

• Transport layer

• network layer

use header info to deliver received segments to correct socket

• demultiplexing at receiver:

• multiplexing at sender:

Answer explanation

handle data from multiple sockets, add transport header (later used for demultiplexing)

uses IP addresses & port numbers to direct segment to appropriate socke

• server

• host

• demux

no handshaking between UDP sender, receiver

• payload

• UDP

• connectionless

Answer explanation

payload:data to/from application layer

• can function when network service is compromised

• TCO

• UDP

helps with reliability IN UDP

• (no RTT incurred

• ▪ “no frills” protocol:

• checksum

using ACKs only

• rdt2

• rdt2.1

• rdt2.2

must specify seq # of packet being ACKed?

• sender

• receiver

use countdown timer to interrupt after “reasonable” amount of time

• rdt2.2

• rdt2

• rdt3.0

sender allows multiple, “in-flight”, yet-to-be-acknowledged packets

• cumulative ACK

• sender

• pipelining