Which addresses are involved in ARP to perform its function on a local network?

Which addresses are involved in ARP to perform its function on a local network?

• A. IP address and MAC address
• B. IP address and DNS name
• C. MAC address and VLAN ID
• D. Subnet address and gateway

Answer: (A)

ARP translates an IPv4 address to a MAC address on the local network. When a host needs to deliver an IPv4 packet to another device on the same LAN, it uses ARP to learn the destination’s MAC address. It broadcasts a request asking “Who has this IP?” and the device with that IP replies with its MAC. With that MAC, the frame can be addressed at Layer 2 and sent to the correct device. DNS names are resolved to IPs at higher layers and aren’t part of ARP, while VLAN IDs and routing-related concepts (subnets and gateways) are separate from the actual IP-to-MAC mapping ARP performs.

ARP translates an IPv4 address to a MAC address on the local network. When a host needs to deliver an IPv4 packet to another device on the same LAN, it uses ARP to learn the destination’s MAC address. It broadcasts a request asking “Who has this IP?” and the device with that IP replies with its MAC. With that MAC, the frame can be addressed at Layer 2 and sent to the correct device. DNS names are resolved to IPs at higher layers and aren’t part of ARP, while VLAN IDs and routing-related concepts (subnets and gateways) are separate from the actual IP-to-MAC mapping ARP performs.