300-420 Question 65
Single answerAn enterprise network is deploying a high-availability design for its campus network using FHRP. The IT team wants to ensure minimal failover time in case the primary gateway becomes unavailable. Which FHRP feature or configuration should be implemented to achieve this goal?
- A
Enable HSRP preemption on the primary gateway
- B
Configure VRRP with a backup virtual IP address
- C
Implement GLBP to distribute traffic across multiple gateways
- D
Use object tracking with HSRP to monitor primary gateway health
Show answer and explanation
Correct answer: A
Explanation
High availability in campus networks using FHRP such as HSRP can be optimized by enabling preemption on the primary gateway. This ensures that the primary gateway can automatically reestablish itself as the Active router after it recovers from a failure, minimizing failover and recovery time.
- A. Correct.
Enabling HSRP preemption ensures that, when the primary gateway recovers from a failure, it retakes its role as the Active router automatically. This reduces failover and recovery time.
- B. Incorrect.
Configuring VRRP with a backup virtual IP address does not reduce failover time because VRRP operates with a single virtual IP for all devices and does not allow multiple IPs for redundancy.
- C. Incorrect.
Implementing GLBP provides load balancing and redundancy, but it does not specifically optimize failover time to the primary gateway.
- D. Incorrect.
Using object tracking with HSRP enhances monitoring and failover decisions, but it does not directly impact preemption or failover time.