Which IPv4 address type is intended to be unique on a LAN and used to identify a single interface?

• A. Unicast IPv4 address
• B. Broadcast IPv4 address
• C. Multicast IPv4 address
• D. Anycast IPv4 address

Answer: (A)

In IPv4, a unicast address is used to identify a single interface and enable one-to-one communication on a network. On a LAN, that address must be unique to avoid conflicts so that packets addressed to that IP are delivered to exactly that device. ARP ties the unicast IP to the device’s MAC, ensuring proper delivery within the local subnet.

Broadcast addresses are meant to reach all hosts on the network, not a single interface. Multicast addresses reach a specific group of devices, not just one. Anycast addresses are assigned to multiple interfaces across possibly different locations, with traffic delivered to the nearest one, so they’re not unique to a single interface on a LAN.