Configuration register

Question 1

What is the configuration register parameter used for in networking devices?

Answer 1

The configuration register parameter is used to control how a router or switch boots up and loads its configuration.

Question 2

Where is the configuration register located?

Answer 2

The configuration register is stored in NVRAM (Non-Volatile Random Access Memory) of the router or switch.

Question 3

How do you enter the ROMMON mode to change the configuration register parameter?

Answer 3

To enter ROMMON mode, you typically need to interrupt the boot sequence by sending a break signal or pressing a specific key combination during startup.

Question 4

What is the default configuration register value on most Cisco devices?

Answer 4

The default configuration register value is usually 0x2102.

Question 5

What is the command to change the configuration register value in ROMMON mode?

Answer 5

The command to change the configuration register in ROMMON mode is confreg followed by the new value (e.g., confreg 0x2142).

Question 6

How do you verify the current configuration register setting?

Answer 6

You can verify the current configuration register setting by using the show version command in privileged EXEC mode.

Question 7

What configuration register value is used to bypass the startup configuration?

Answer 7

The configuration register value 0x2142 is used to bypass the startup configuration.

Question 8

What value would you set to tell the device to boot into ROMMON mode?

Answer 8

The configuration register value 0x2101 tells the device to boot from the boot ROM (ROMMON mode).