The following debug messages are noticed for HSRP group 2. But still neither R1 nor R2 has identified one of them as standby router. Identify the reason causing the issue.
Note: only show commands can be used to troubleshoot the ticket.



Correct Answer: E
Explanation/Reference:
Check the link between R1 & R2 where HSRP group 2 is running (interface E1/0)

As we see R1 is using access-list 102 to filter traffic coming to interface E1/0 (inbound direction). Continue checking the access-list 102 of R1:

R1 is blocking any traffic send to 224.0.0.102. Notice that in the syntax of an access-list, the source address is always defined before the destination address. "224.0.0.102" is the muticast address which HSRP version 2 uses to send Hello packets to (instead of 224.0.0.2 of HSRP version 1). Therefore all HSRP sent from neighbor (R2 in this case) to R1 is dropped. R1 keeps sending HSRP Hello packets and think it is the active HSRP router.