200-301 Question 349
Single answerA company has deployed a network with two routers configured to provide gateway redundancy for end devices. During a scheduled maintenance, one of the routers is shut down, but the end devices continue to send traffic without interruption. Which First Hop Redundancy Protocol (FHRP) is most likely being used in this scenario?
- A
Hot Standby Router Protocol (HSRP)
- B
Virtual Router Redundancy Protocol (VRRP)
- C
Gateway Load Balancing Protocol (GLBP)
- D
Border Gateway Protocol (BGP)
Show answer and explanation
Correct answer: A
Explanation
The described scenario involves a seamless failover of gateway functionality when one router is taken offline. This is the core function of a First Hop Redundancy Protocol (FHRP). Among the options, HSRP is the most likely protocol being used because it is designed to provide redundancy for gateway routers in a Cisco environment. Other options like VRRP and GLBP have different use cases or additional features not mentioned in the scenario, while BGP is unrelated to FHRPs.
- A. Correct.
HSRP is a Cisco proprietary FHRP that allows one router to act as the active gateway and another as the standby. In this scenario, HSRP is most likely being used because it provides seamless failover when the active router goes down.
- B. Incorrect.
VRRP is a standards-based protocol similar to HSRP, but it is less likely in this scenario because the question does not specify interoperability across vendors.
- C. Incorrect.
GLBP provides both redundancy and load balancing, allowing multiple routers to act as active gateways. This scenario describes redundancy only, not load balancing, so GLBP is unlikely.
- D. Incorrect.
BGP is not an FHRP. It is a routing protocol used for exchanging routing information between autonomous systems on the internet, making it irrelevant to this scenario.