Which configuration prevents this loop?

Refer to the exhibit.

The output of the traceroute from R5showsaloopin the network

Which configuration prevents this loop?

A)

B)

C)

D)

A . Option A
B . Option B
C . Option C
D . Option D

View Answer

Answer: A

Explanation:

The reason for the loop is that R2is forwarding the packets destined to 10.1.1.1 to R4, instead of R1. This is because in the redistribute OSPF statement, BW metric has a higher value and delay has a value of 1. So, R2choosesR4overR 1 for 10.1.1.0/24 subnet causing a loop.

Now, R5 learns 10.1.1.0/24fromR 3 and advertises the same route to R4, that R4 redistributes back in EIGRP. If R3 sets a tag of 1 while redistributing EIGRP in OSPF, and R 4 denies all the OSPF routes with tag 1 while redistributing, it will not advertise 10.1.1.0/24 back into EIGRP Hence, the loop will be broken.