CompTIA Network+ Practice Test

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What is the command used to view ARP protocol information for troubleshooting?

show arp
display mac-address
show connections
view routing table

The correct answer is: show arp

The correct command to view ARP (Address Resolution Protocol) information for troubleshooting is "show arp". This command is used in networking to display the ARP table, which contains mappings between IP addresses and their corresponding MAC (Media Access Control) addresses. By examining the ARP table, network administrators can troubleshoot issues related to network connectivity, address resolution, and identify possible duplicate IP addresses or MAC address conflicts. The ARP table is crucial for devices that communicate over Ethernet, as it allows the network devices to translate network layer addresses (IP addresses) into link layer addresses (MAC addresses), which are used for actual data transmission over the physical network. Therefore, using the "show arp" command provides valuable insights into the ARP-related operations and informs troubleshooting strategies on a local network. The other options are related to different aspects of network management or diagnostics but do not specifically provide ARP protocol information. For instance, displaying the MAC address would typically enumerate the MAC addresses on the device, while showing connections would present information about current network connections. Viewing the routing table deals with path information in the network but does not relate directly to ARP functionality.