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Discussion Section Week 3. EE122: Introduction to Communication Networks Fall 2006. Sockets and Ports. Chicken (3.4.5.6). Cow (7.7.7.7). In server, there can be multiple sockets for one port. Web Server. OS. OS. Explorer. sock11. sock1. port80. 2005.

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discussion section week 3

Discussion SectionWeek 3

EE122: Introduction to Communication Networks

Fall 2006

sockets and ports
Sockets and Ports

Chicken (3.4.5.6)

Cow (7.7.7.7)

In server, there can be multiple sockets for one port

Web Server

OS

OS

Explorer

sock11

sock1

port80

2005

Socket 1 and 2 do not have a corresponding client. It only accepts incoming connections

Firefox

sock3

8006

sock12

sock4

Host address of client in the packet is also needed for the OS of server to forward the packet to a correct socket,

sock5

Dog (9.8.7.6)

Mail Server

OS

Explorer

sock2

port25

sock13

6001

and port number of client, too – four tuples

sock6

Outlook

3500

sock14

In client, there is 1-to-1 between socket and port

select
select()

Monitor read of 3 inputs