Which statement is true about PPP tunnels and bridge capability?

• A. All PPP-based tunnels can be bridged
• B. PPP-based tunnels cannot be bridged
• C. Bridging is only supported on some models
• D. Bridge mode disables tunneling

Answer: (A)

Bridging operates at Layer 2, so interfaces can be combined into the same Ethernet-like domain. A PPP tunnel in RouterOS is a virtual interface that carries PPP frames between two endpoints. Because a bridge can include most interfaces that forward Ethernet-like frames, you can add a PPP tunnel interface to a bridge just like you would with a physical NIC. Once placed in the same bridge as your local LAN interfaces, frames learned on either side of the tunnel are forwarded across the tunnel, effectively extending the LAN through the PPP path.

That’s why all PPP-based tunnels can be bridged: the tunnel is just another interface you can include in a bridge, enabling a transparent L2 connection between sites. It doesn’t imply any limitation by model family, nor does it inherently disable tunneling when you bridge.