Which statement is true about IP-IP tunnels?
A. Intermediate devices must have a route to the destination address of the traffic being tunneled.
B. Intermediate devices must have a route to both the tunnel source address and the tunnel destination address.
C. Intermediate devices must have a route to the tunnel destination address but do not require a route to the tunnel source address.
D. Intermediate devices must have a route to the tunnel source address but do not require a route to the tunnel destination address.
|
Download Printable PDF. VALID exam to help you PASS. |
 |
Three requirements that have to be met so that Tunnel comes up in Juniper:
Tunnel endpoints must have a valid route to the remote endpoint,
all intermediary devices must have a route to the endpoint,
tunnel endpoints must have a route that directs traffic into the tunnel
B is correct. Routing is based on destination, not source; Only the route for the destination tunnel endpoint is necessary for each packet.
If you’re thinking about a lab environment with a single intermediary device, it’s incidental that it will have a route for both tunnel endpoint IPs. Only the relevant destination will be considered with each packet it processes.
The intermediary devices, located in the forwarding path between the tunnel endpoints, must be able to route to each of the tunnel endpoints. It is the B.