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Difficulty: EasyUtilizing Command-Line Network Troubleshooting Utilities

A network technician needs to inspect a host computer's local cache to view the mapping of IP addresses to physical MAC addresses. Which command-line utility should the technician execute?

  1. arp -aAnswer
  2. B
    nslookup
  3. C
    netstat -a
  4. D
    dig

Answer

The correct command is arp -a, which lists the local Address Resolution Protocol table containing IP-to-MAC address entries.
The arp -a command displays the system ARP table, which lists cached IP addresses mapped to their corresponding physical network interface (MAC) addresses.

Step-by-Step Solution

1
Identify the troubleshooting objective.
The requirement is to display local IP-to-MAC address translations.
Address Resolution Protocol (ARP) maintains the dynamic mapping between Layer 3 IP addresses and Layer 2 MAC addresses.
2
Select the appropriate command-line command.
Running arp -a outputs the active ARP cache table.
The arp tool with the -a parameter lists all cached ARP entries for all interfaces.

Key Concept

Address Resolution Protocol (ARP) CLI Diagnostics
Estimated Time:45s
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Topics

Utilizing Command-Line Network Troubleshooting Utilities

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