When a host initiates an ARP request, who is it trying to identify?

When a host initiates an ARP request, who is it trying to identify?

• A. The IP address of a device
• B. The MAC address of a device on the same LAN
• C. The MAC address of the default gateway
• D. The hostname of a remote server

Answer: (C)

When a host initiates an ARP (Address Resolution Protocol) request, it is trying to identify the MAC address of a device on the same LAN that corresponds to a specific IP address. This process is essential for network communication because devices on a network use MAC addresses to communicate over Ethernet, whereas IP addresses are used for logical addressing. In a typical scenario, when a host needs to send a packet to another device, it must determine the MAC address associated with the destination IP address. If the host does not already have this MAC address in its ARP cache, it broadcasts an ARP request on the network to discover it. The device with the corresponding IP address will then respond with an ARP reply, providing its MAC address. Therefore, the primary purpose of an ARP request is to resolve the MAC address of another device within the same local area network (LAN) that aligns with a given IP address.

When a host initiates an ARP (Address Resolution Protocol) request, it is trying to identify the MAC address of a device on the same LAN that corresponds to a specific IP address. This process is essential for network communication because devices on a network use MAC addresses to communicate over Ethernet, whereas IP addresses are used for logical addressing.

In a typical scenario, when a host needs to send a packet to another device, it must determine the MAC address associated with the destination IP address. If the host does not already have this MAC address in its ARP cache, it broadcasts an ARP request on the network to discover it. The device with the corresponding IP address will then respond with an ARP reply, providing its MAC address.

Therefore, the primary purpose of an ARP request is to resolve the MAC address of another device within the same local area network (LAN) that aligns with a given IP address.