350-401 Question 197
Single answerYou are configuring a network with two routers that need to provide gateway redundancy for a subnet. You decide to use HSRP (Hot Standby Router Protocol). During the configuration, you set one router as the active gateway and the other as the standby. However, after testing failover, you notice that traffic from the end devices is not routing as expected. Which of the following is MOST likely the issue?
- A
The virtual IP address was not assigned to the HSRP group.
- B
The priority of the active router is set lower than the standby router.
- C
Preemption is not enabled on the standby router.
- D
The HSRP version being used does not support failover.
Show answer and explanation
Correct answer: A
Explanation
HSRP relies on a virtual IP address acting as the shared gateway for devices in the subnet. If the virtual IP address is not configured, end devices will not have a valid gateway, leading to traffic routing failures. The other options involve specific settings that, while important, do not directly prevent failover from occurring.
- A. Correct.
If the virtual IP address is not assigned to the HSRP group, end devices will not know which IP address to use as the default gateway, causing traffic routing issues.
- B. Incorrect.
The priority of the active router being lower than the standby would make the standby router become the active router, but this would not prevent failover from functioning.
- C. Incorrect.
Preemption is optional and only impacts whether a higher-priority router will take over as active after recovery. It does not stop basic failover functionality.
- D. Incorrect.
Both HSRP version 1 and version 2 support failover. This is unlikely to be the issue unless the protocol was misconfigured entirely.