Changing CLI Prompt in Cisco Network Devices

What happens to the CLI prompt after entering the command 'ip access-list standard aaa' in global configuration mode?

1) config-std-nacl
2) config-std-acl
3) config-std-aaa
4) config-std-access
Final answer:

Answer:

After entering the command 'ip access-list standard aaa' in global configuration mode, the CLI prompt changes to 'config-std-nacl'.

When configuring access control lists (ACLs) on Cisco network devices, it is essential to understand how the Command Line Interface (CLI) prompts change based on the commands entered. In this specific scenario, entering the command 'ip access-list standard aaa' from global configuration mode transitions the CLI prompt to 'config-std-nacl'.

This change signifies that the user has entered the standard named access control list configuration mode. In this mode, administrators can create or modify standard named ACLs that filter traffic based on the source IP address. Standard ACLs evaluate traffic based solely on the source IP address, providing a level of security by controlling which packets are allowed or denied based on this information.

The 'aaa' portion of the command is simply a label or name given to the standard ACL for identification purposes. By transitioning to 'config-std-nacl', users can set specific rules within the standard ACL to control traffic flow within the network.

It is important to note that standard ACLs are less granular than extended ACLs, which can filter traffic based on a combination of source and destination IP addresses, ports, and other criteria. Standard ACLs are commonly used when the filtering criteria only require the source IP address for decision-making.

In summary, entering the command 'ip access-list standard aaa' in global configuration mode changes the CLI prompt to 'config-std-nacl', enabling the configuration of standard named ACLs that filter traffic based on source IP addresses.