What Is ROM

Introduction to routers in a WAN

NVRAM has the following characteristics and functions:

  • Provides storage for the startup configuration file
  • Retains content when a router is powered down or restarted

Flash memory has the following characteristics and functions:

  • Holds the IOS image
  • Allows software to be updated without removing and replacing chips on the processor
  • Retains content when a router is powered down or restarted
  • Can store multiple versions of IOS software
  • Is a type of electrically erasable programmable read-only memory (EEPROM)

ROM has the following characteristics and functions:

  • Maintains instructions for power-on self test (POST) diagnostics
  • Stores bootstrap program and basic operating system software
  • Requires replacing pluggable chips on the motherboard for software upgrades

Interfaces have the following characteristics and functions:

  • Connect routers to a network for packet entry and exit
  • Can be on the motherboard or on a separate module

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