Which statement about PPP-based tunnel bridging is true?

• A. All PPP-based tunnels can be bridged
• B. PPP-based tunnels cannot be bridged
• C. Only client tunnels can be bridged
• D. Bridging requires external hardware

Answer: (A)

Bridging at Layer 2 using PPP-based tunnels. In RouterOS, PPP interfaces (PPPoE, PPTP, L2TP, PPP over GRE, etc.) are virtual point-to-point links that can be added to a bridge just like a physical Ethernet interface. When you include a PPP-based tunnel in a bridge along with your local LAN ports, the bridge forwards frames between the local network and the remote network across that tunnel, making the tunnel behave as if the two sites are on the same wire. This capability is provided by software bridging, so no external hardware is required. It isn’t limited to client tunnels, and it isn’t true that PPP-based tunnels cannot be bridged.