Which addressing is used to send information from one Layer 2 interface to another Layer 2 interface?

• A. IP Address
• B. MAC Address
• C. Subnet Mask
• D. Port Number

Answer: (B)

Layer 2 communication relies on MAC addresses, the hardware identifiers on network interfaces. When information is sent from one Layer 2 interface to another on the same local network, the frame carries a destination MAC and a source MAC. The destination MAC ensures the frame reaches the correct recipient, and switches use MAC address tables to forward frames accordingly. IP addresses are for routing between networks (Layer 3), not delivering frames on a single local link, while subnet masks relate to IP addressing and port numbers pertain to transport-layer protocols. So the addressing used to move information between Layer 2 interfaces is the MAC address.