What exact term describes the mechanism used to bridge PPP tunnels?

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

Answer: (A)

Bridging Control Protocol is the term used for the mechanism that handles bridging across PPP tunnels. After a PPP link is established with Link Control Protocol, enabling the two ends to carry Ethernet frames over the tunnel requires a dedicated control protocol that negotiates and maintains bridging capabilities. This protocol ensures both ends agree to operate in bridging mode and governs how frames are forwarded across the PPP path, effectively making the tunnel behave like a shared LAN segment. The other options use similar words but do not match the exact nomenclature of the PPP mechanism used for bridging; they describe generic concepts rather than the specific protocol name.