Refer to the exhibit. Which configuration on the HSRP neighboring device ensures that it becomes the active HSRP device in the event that port fa1/1 on Switch_A goes down?
A.
Switch_B(config-if)#ip address 10.10.10.2 255.255.255.0
Switch_B(config-if)#standby 1 priority 200
Switch_B(config-if)#standby 1 preempt
Switch_B(config-if)#standby 1 ip 10.10.10.10
Switch_B(config-if)#standby 1 track interface fa 1/1
B.
Switch_B(config-if)#ip address 10.10.10.2 255.255.255.0
Switch_B(config-if)#standby 1 priority 200
Switch_B(config-if)#standby 1 ip 10.10.10.10
C.
Switch_B(config-if)#ip address 10.10.10.2 255.255.255.0
Switch_B(config-if)#standby 1 priority 195
Switch_B(config-if)#standby 1 preempt
Switch_B(config-if)#standby 1 ip 10.10.10.10
D.
Switch_B(config-if)#ip address 10.10.10.2 255.255.255.0
Switch_B(config-if)#standby 1 priority 190
Switch_B(config-if)#standby 1 ip 10.10.10.10
Switch_B(config-if)#standby 1 track interface fa 1/1
Explanation:
Switch_B need to ensure that its HSRP standby group 1 priority is lower than Switch_A ‘s priority i.e. less than 200. This is so that it does not become the Active router while the network is healthy. However, Switch_A is tracking its interface fa1/1 interface and will decrement its priority by 10 to 190 if it fails. therefore, Switch_B must ensure its priority is higher than 190 to enable it to become the HSRP active device in this instance. Switch_B must also NOT be tracking its own fa1/1 interface otherwise its own priority will simultaneously decrement and will not become the HSRP active device even after a failure of the interface.
(B) is correct as it matches the above criteria.
(A) and (C) are not correct as Preempt must be configured for failover to occur on the basis of a change in HSRP priorities. (see
http://www.cisco.com/en/US/tech/tk648/tk362/technologies_q_and_a_item09186a00800a9679.shtml#q6)(D) is incorrect on the basis that fa1/1 on Switch_A is connected to fa1/1 on Switch_B meaning both would reduce their priorites to 190 simultaneously in the event of an interface failure. As their relative priorities remain equal, the HSRP status will remain the same.