Sockets

A socket Full Duplex File Descriptor that acts an endpoint for network communication. Identified by IP Address + Port

• 2 processes want to communicate over a network → 2 sockets are made

Socket Creation Process

1. Client initiates request for connection. It is assigned a random port greater than 1024
2. Server waits for client requests from specific port
3. Request is received
4. Server accepts connection from client

Socket Communication

A method of two-way communication between 2 applications on the same network. It utilizes sockets/endpoint bound by port number on an ip so that the tcp layer can identify applications. A socket/endpoint is the combination of an ip address and port number.

Nodes are colloquial terms for devices. One node listens on a particular port of an ip while the other reaches out the instigate a connection.

We are responsible for programming socket commands that perform different actions depending on what signal another node sends. The following is the process:

Socket creation

socket.socket() - create a socket

socket.bind(host,port) - bind the socket to a host and a port

Socket send. instigate

socket.send() - send a signal

Socket receiving process

socket.listen() - constantly listen for a send signal

socket.recv() - received the signal and decode the message

Socket closing

socket.close() - close the socket