100-150 Question 248
Select 3A network engineer is troubleshooting connectivity issues on a switch. They need to confirm the IP address configuration of interfaces, check for connected neighboring devices, and verify the switch's MAC address table. Which three commands should the engineer use to gather this information?
- A
show ip interface brief
- B
show cdp neighbors
- C
show mac address-table
- D
show run
- E
show version
- F
show ip route
Show answer and explanation
Correct answers: A, B, C
Explanation
To troubleshoot the described connectivity issue, the engineer must verify the IP address configuration of interfaces (using 'show ip interface brief'), identify directly connected neighbors (using 'show cdp neighbors'), and analyze the MAC address table (using 'show mac address-table'). These commands provide the necessary insights for resolving connectivity problems in a switched environment, while the other options are either unrelated or overly broad for this specific scenario.
- A. Correct.
The 'show ip interface brief' command provides a summary of the IP address configuration and status of interfaces, which is directly useful for verifying IP settings.
- B. Correct.
The 'show cdp neighbors' command displays information about directly connected Cisco devices, which is essential for identifying neighboring devices.
- C. Correct.
The 'show mac address-table' command shows the MAC addresses learned by the switch, which is crucial for troubleshooting Layer 2 connectivity issues.
- D. Incorrect.
The 'show run' command provides the entire running configuration of the device, but it is not focused on the specific troubleshooting tasks mentioned in the question.
- E. Incorrect.
The 'show version' command provides details about the device hardware and software but does not directly assist in verifying IP configurations, neighbors, or the MAC address table.
- F. Incorrect.
The 'show ip route' command displays the routing table, which is more relevant for Layer 3 routing issues than for the tasks described in the question.