Which switch port is used to send frames to the host with IPv4 address 10.1.1.5?

• A. Fa0/1
• B. Fa0/11
• C. Fa0/5
• D. Fa0/9

Answer: (B)

Switches forward frames based on MAC addresses using the CAM (Content Addressable Memory) table. The IPv4 address of a host is used at Layer 3, but the switch uses the destination MAC address at Layer 2 to decide where to send the frame. When a host with IP 10.1.1.5 responds or is targeted, the host’s IP is resolved to a MAC via ARP, and the switch learns that MAC on the port where the host is connected. The CAM table then maps that MAC to a specific port, so frames destined for that host are forwarded out that port. In this scenario, the switch has learned the host’s MAC on Fa0/11, so frames addressed to 10.1.1.5 are sent on Fa0/11. If there were no CAM entry yet, the switch would flood the frame to all ports in the same VLAN, but once the MAC is learned, the correct port is Fa0/11.