Different Types of Router Memory

Which are the different types of Router memory

ROM

Flash Memory

RAM

NVRAM

What is ROM

Available on router's processor board

Store initial bootstraps software

Maintain instruction for POST diagnostics

What is flash memory

Contain full operating system image

Electronically erasable and re-programmable memory

Allow us to upgrade the IOS without removing flash memory from system

Retain content when router is powered down or restarted

What is RAM

Loses information when router is shutdown or restarted

Hold running configuration

 Such as arp cache, routing table

Temporary memory

Perform packet buffering

What is NVRAM

Store startup configuration file

Fast memory

Retain content when the router is restarted

IOS reads startup config when the route boots up