300-420 Question 71
Single answerAn enterprise network is deploying a First Hop Redundancy Protocol (FHRP) to ensure gateway redundancy for critical services. The design requires a protocol that can provide load balancing across multiple gateways while also supporting IPv4 and IPv6. Which FHRP should the network engineer select?
- 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 only FHRP that supports both gateway redundancy and load balancing across multiple active gateways. Additionally, GLBP supports both IPv4 and IPv6, which aligns with the design requirements specified in the scenario. Other protocols like HSRP and VRRP focus on redundancy but do not natively support load balancing, while EIGRP is a routing protocol and not an FHRP.
- A. Incorrect.
HSRP provides gateway redundancy but does not support load balancing. It is suitable for environments that require a single active gateway with a standby backup.
- B. Incorrect.
VRRP is an open standard protocol that provides gateway redundancy but does not natively support load balancing. It is similar to HSRP in functionality.
- C. Correct.
GLBP is an FHRP that supports load balancing across multiple active gateways while providing redundancy. It also supports IPv4 and IPv6, making it the correct choice for the given design requirements.
- D. Incorrect.
EIGRP is a dynamic routing protocol, not an FHRP. It is used for routing decisions, not for providing gateway redundancy or load balancing.