Which of the following statements are TRUE about the selection of the active router in an HSRP group? (Choose two.)

A. The router with the highest priority becomes the active router.

B. The router with the lowest priority becomes the active router.

C. The router with the highest IP address becomes the active router if the priorities of all routers are the same.

D. The router with the lowest IP address becomes the active router if the priorities of all routers are the same. AC








 

Suggested Answer: Explanation

The following two statements are TRUE about the selection of the active router in an HSRP group:
The router with the highest priority becomes the active router.
The router with the highest IP address becomes the active router if the priorities of all routers are the same.
All routers in an HSRP group have a priority. The default priority of HSRP routers is 100. However, HSRP routers can be assigned any value from 0 through 255 by using the standby priority command. The router with the highest priority becomes the active router of that HSRP group. The active router is responsible for forwarding packets to and from the virtual router (default gateway).
If the priorities of all the routers in the HSRP group are all the same, then the IP addresses of the routers are considered. The router with the highest IP address of an HSRP interface becomes the active router.
A standby router is also selected for the HSRP group. When the active router of the HSRP group fails, the standby router becomes the active router. You can decrement the priority of the active router if one of its interfaces goes down if you have enabled tracking for the respective HSRP interface. Interface tracking can be enabled by using the standby track command. By default, the priority of the active router is decreased by 10 when it goes down.
When the original active router recovers the failed interface, it may become the active router again if the standby preempt command was used on the router. This command specifies that if the router has the highest priority in the HSRP group, then it is immediately selected as the active router for the group. Therefore, if you want the original active router to resume the role when it comes online again, the standby preempt command should be used during its configuration.
Consider a network segment that has three routers rtrA, rtrB, and rtrC with HSRP enabled all of them. The rtrA router is selected as the active route, while rtrB is the standby router. The partial output of the show running-config command for rtrA is as follows:
 
The partial output of the show running-config command for rtrB is as follows:
 
Note that either router will be capable of assuming the role of active router if its priority becomes higher for the following reasons:
Decrements in the priority of the active router due to the loss of an interface
A manual change in the priorities by the administrator
The recovery of a down route that comes back online with a higher priority
Objective:
Infrastructure Services -
Sub-Objective:
Configure and verify first-hop redundancy protocols
References:
Home > Support > Configuring HSRP > How to Configure HSRP
Home > Support > Configuring HSRP > Information About HSRP > HSRP Operation
Internetworking Case Studies > Using HSRP for Fault-Tolerant IP Routing > Configuring HSRP
Home > Support > Configuring HSRP > Information About HSRP > HSRP Priority and Preemption

This question is in 300-115 Implementing Cisco IP Switched Networks (SWITCH) Exam
For getting Cisco Certified Network Professional (CCNP) Routing and Switching Certificate





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