Which type of memory stores the configuration of a router or switch by default?

NVRAM (Non-Volatile Random Access Memory) is the default storage location for the startup

configuration file of a Cisco router or switch.expand_more Here's why:

Non-Volatility: NVRAM retains its contents even when the device loses power.expand_more This is

essential for storing the startup configuration, which contains critical settings like interface

configurations, routing protocols, and passwords.

Read/Write Capability: Unlike ROM, NVRAM allows you to both read and write data. This makes it

possible to modify the configuration and save the changes into NVRAM as the startup configuration.

Other Memory Types and Their Functions:

RAM (Random Access Memory): RAM is volatile memory, meaning it loses its contents when the

device is powered off.expand_more It's used to store the running configuration (currently active

configuration), routing tables, and other temporary data required for the device's operation.

ROM (Read-Only Memory): ROM is non-volatile and stores the bootstrap program used to initiate the

boot process of the device.expand_more It's not modifiable by the user.expand_more

Flash: Flash memory is also non-volatile.expand_more It's primarily used to store the Cisco IOS

image (operating system) and can also store backup configuration files and other data.