You have applied the following configuration to Router71, as indicated in the following partial output of the show run command:

• 300-410 : All Parts

Explanation:
One is the number of the HSRP group. Hot Standby Routing Protocol (HSRP) can be used to provide default gateway redundancy for computers sharing the same gateway. At least two routers are gathered into a routing group, which in this case is numbered 1. One of the routers will answer ARP requests for the standby IP address (in this case 171.16.6.100), which is the address the computers will have configured as their default gateway. That router is called the active router. If that router goes down, then the other router will start answering ARP requests for the standby IP address.

This is not a Gateway Load Balancing Protocol configuration. That is an alternative to HSRP which allows both routers to be used while still providing backup to one another. That configuration would be different in that it uses GLBP groups rather than standby groups, among other differences.

This router will be not prevented from taking back over as active router when it recovers from an outage of its Serial 0 interface. The presence of the command standby 1 preempt indicates that the router can take back over or preempt the other router when it recovers from an outage of its Serial 0 interface. The command standby 1 track Serial0 tells the router to track the up/down state of its Serial 0 interface. If it goes down, it knows to decrement its HSRP priority by 10 (the decrement value). This will drop its HSRP priority to 95. We do not see the priority of the other router in the group, but if for example its priority is 100, this configuration would allow it to take over as active router.

Objective:
Infrastructure Services
Sub-Objective:
Configure and verify tracking objects