Which statement is true about IP-IP tunnels?
Which statement is true about IP-IP tunnels?
In IP-IP tunnels, traffic is encapsulated and forwarded through intermediate devices to the tunnel endpoints. For the end-to-end communication to be successful, the intermediary devices must be able to route packets from the tunnel's source to its destination and vice versa. This requires knowledge of both the source and destination addresses of the tunnel to ensure bidirectional communication. Therefore, intermediate devices must have a route to both the tunnel source address and the tunnel destination address.
"All intermediary devices must have a route to the tunnel endpoints" I just got this from Juniper JNCIS-ENT material and it says "Endpoints" in plural so the correct answer should be B
Tunnels are unidirectional, the intermediate devices must know a route to the destination tunnel address for A to B direction, the opposite direction tunnel B to A must know a route to the destination tunnel address. C is the correct answer.
The answere should be B, if answere is C then how retunr traffic is travers without tunnel source ip information?
it's all about intermediate devices, they need to know which direction sent that packets. a little bit awkward, if we can traverse in one direction, but cant return back. so B variant is good. but C it could be too...
A-symmetric routing case. route to source IP is not required.
A tunnel is per direction. For having bidirectional communication, two tunnels are required. So you need the destination only -> C
Intermediary devices need to have a route to both tunnel endpoints. Answer B is correct
correct
To form a tunnel you need 3 things, Tunnel Source, Tunnel Destination and IP. so the intermediary devices need to have a route to both.
The intermediary devices, located in the forwarding path between the tunnel endpoint, must be able to route between the tunnel endpoints This was also taken from the training material
Just a remark to Wauzer's commentary: It is a trick question because IP internetworks are based on a per-hop routing paradigm. IP-IP tunnels are only a special case in regard to original source and destination addresses being temporarily replaced and encapsulated. Therefore, intermediate systems must have destination routing visibility only, since packet (and frame) delivery is resolved locally. There are two exceptions (one unrelated to the topic at hand), such as reverse path checkups and if the system in not an intermediate host but either the tunnel initiator or the headend.
"All intermediary devices must have a route to the tunnel endpoints"