What command-line tool is used for viewing and modifying the ARP cache?

• A. Netstat
• B. Arp
• C. Route
• D. Netsh

Answer: (B)

The command-line tool used for viewing and modifying the ARP (Address Resolution Protocol) cache is "arp." This tool allows users to display the current ARP entries and make changes to them, which is essential for managing how IP addresses resolve to MAC addresses on a local network.

When using this command, you can see which IP addresses are associated with which MAC addresses, which can help in troubleshooting network issues or optimizing network performance. The arp command also enables users to add or delete ARP entries directly, providing hands-on control over the ARP cache.

The other tools mentioned serve different purposes. For example, netstat is mainly used for displaying network connections, routing tables, and interface statistics. The route command is focused on displaying and manipulating the IP routing table rather than the ARP cache specifically. Netsh is useful for managing Windows networking configurations, including firewalls and interface settings, but it is not specifically tailored for ARP cache manipulation. Thus, arp is clearly the appropriate choice for tasks related to the ARP cache.