300-420 Question 66
Single answerAn enterprise network is designed with two core routers in a high-availability configuration. To ensure seamless failover and redundancy for clients in the campus network, which First Hop Redundancy Protocol (FHRP) design should you implement?
- A
Use HSRP with both core routers configured in the same group, and one router as the active gateway.
- B
Use VRRP with both core routers configured as master routers to share the traffic load.
- C
Use GLBP with both core routers participating to balance traffic and provide redundancy.
- D
Use HSRP with preemption disabled to avoid unnecessary failover events.
Show answer and explanation
Correct answer: C
Explanation
GLBP (Gateway Load Balancing Protocol) is the most effective FHRP solution for this scenario as it enables both redundancy and traffic load balancing. Unlike HSRP and VRRP, where only one router is active at a time, GLBP allows multiple routers to actively participate in forwarding traffic while providing seamless failover in the event of a router failure. This makes it ideal for a campus network requiring high availability and efficient resource utilization.
- A. Incorrect.
HSRP with one active router provides redundancy, but it does not offer traffic load balancing. This option may leave the standby router underutilized, making it less optimal for high-availability designs requiring load sharing.
- B. Incorrect.
VRRP does not allow multiple routers to act as master routers simultaneously. Only one router is designated as the master, which does not fulfill the requirement to share the traffic load while maintaining redundancy.
- C. Correct.
GLBP provides both redundancy and traffic load balancing by allowing multiple routers to participate as active gateways, making it the most suitable option for high availability in this scenario.
- D. Incorrect.
Disabling preemption in HSRP can help avoid unnecessary failover events but does not address the requirement for traffic load balancing. Additionally, it does not fully utilize the available resources.