300-420 Question 70
Single answerAn enterprise network is designed with multiple VLANs across different access switches. To ensure high availability for the default gateway of VLANs, the network engineer is tasked with implementing a First Hop Redundancy Protocol (FHRP). The design requires load sharing between two distribution layer switches while maintaining redundancy. Which FHRP should the engineer implement to meet this requirement?
- A
Hot Standby Router Protocol (HSRP)
- B
Virtual Router Redundancy Protocol (VRRP)
- C
Gateway Load Balancing Protocol (GLBP)
- D
Static routing with multiple default gateways
Show answer and explanation
Correct answer: C
Explanation
The Gateway Load Balancing Protocol (GLBP) is the best choice in this scenario because it allows multiple routers to share the load of gateway traffic while providing redundancy in case one router fails. HSRP and VRRP primarily offer redundancy without native load sharing capabilities. Static routing is not dynamic and does not fulfill the redundancy or load sharing requirements outlined in the question.
- A. Incorrect.
HSRP provides redundancy by designating one router as the active gateway and another as the standby, but it does not support load sharing across both routers by default.
- B. Incorrect.
VRRP is similar to HSRP in functionality, providing redundancy by electing a master router, but it also does not natively support load sharing across multiple routers.
- C. Correct.
GLBP is specifically designed to provide both redundancy and load sharing by allowing multiple routers to actively participate as gateways for traffic, distributing the load across them.
- D. Incorrect.
Static routing with multiple default gateways does not meet the requirements of dynamic redundancy or load sharing, as it lacks the ability to automatically failover or balance traffic effectively between routers.