Refer to the exhibit. Which two options are two problems that can occur with this configuration? (Choose two)
A. The MPLS path from R1 to R5 becomes unreachable.
B. R1 and R5 are unable to establish an LDP relationship.
C. The label for the R1 loopback address is filtered from other MPLS routers.
D. The label for the R5 loopback address is filtered from other MPLS routers.
E. MPLS traffic from R1 to R5 takes a suboptimal path.
This is totally weird. R1 Gi0/0 and R5 Gi0/0 are in the same subnet. So we should assume directly connected!
These interfaces and loopbacks are in OSPF.
So there should be (!) IGP reachability if you imagine there are no P1 & P2 routers between them or
if there is a pseudowire or something. or there is another link which is not in the diagram.
However, all you need to realise is R5’s loopback is not in LOOPBACK-ONLY ACL. Hence D is correct.
B is not correct as there is IGP reachability.
C is not correct as Lo0 on R1 is in the ACL
E is not correct. There looks like there is only 1 path.
A is basically the only one left. Although I don’t think it’s entirely correct. It’s just there is no MPLS path,
they are directly connected.
Option B seems as correct as A & D.