What is the bridging mechanism called for PPP tunnels?

• A. Bridging control protocol
• B. Bridge protocol
• C. Bridging protocol
• D. Bridge control protocol

Answer: (A)

The concept being tested is how a PPP tunnel can carry Ethernet-like bridging between two LANs. This is handled by the Bridging Control Protocol, a PPP mechanism designed to manage bridging across the PPP link. It coordinates carrying and forwarding bridged frames through the tunnel so that devices on both ends appear as if they’re on the same Ethernet network, preserving MAC addresses and LAN behavior over the point-to-point connection. The other terms aren’t the official name for this PPP bridging feature, so they don’t describe the mechanism used to bridge across a PPP tunnel.