# DHCP

DHCP is a service that uppon request assigns IP address and other paramaters
to a machine on a network.

It solves the issue of having to manually set up every device

# What is a port

An IP address identifies specific machine on a network,
**a port** identifies specific **application** running on that machine.

A port is **a number** between [1 - 65,535] that is assigned by the OS
to any application that wants to communicate over the network.
Can be choosen at random, can be hard set.

![pic_port_header](https://i.imgur.com/TM0pOQN.png)

# How Router's NAT works