300-420 Question 69
Single answerAn enterprise network design team is implementing a First Hop Redundancy Protocol (FHRP) to provide gateway redundancy on a VLAN with two Layer 3 switches. The team decides to use a protocol that allows for load sharing across both switches while providing redundancy. Which FHRP should the team implement?
- A
Hot Standby Router Protocol (HSRP)
- B
Virtual Router Redundancy Protocol (VRRP)
- C
Gateway Load Balancing Protocol (GLBP)
- D
Enhanced Interior Gateway Routing Protocol (EIGRP)
Show answer and explanation
Correct answer: C
Explanation
Gateway Load Balancing Protocol (GLBP) is the best choice for the scenario because it is the only FHRP that supports both redundancy and load sharing across multiple routers. Unlike HSRP and VRRP, which have a single active gateway, GLBP allows multiple routers to actively forward traffic, improving resource utilization and providing a fault-tolerant solution.
- A. Incorrect.
HSRP provides gateway redundancy but does not support load sharing; only one router actively forwards traffic at a time.
- B. Incorrect.
VRRP provides gateway redundancy similar to HSRP but also lacks support for load sharing; a single router is active.
- C. Correct.
GLBP is specifically designed to provide both gateway redundancy and load sharing by distributing traffic across multiple routers.
- D. Incorrect.
EIGRP is a dynamic routing protocol and not an FHRP. It does not provide gateway redundancy or load sharing in the context of first-hop redundancy.