350-401 Question #226: Real Exam Question with Answer & Explanation

Question

Refer to the exhibit. Edge-01 is currently operational as the HSRP primary with priority 110. Which command on Edge-02 causes it to take over the forwarding role when Edge-01 is down?

Options

• Astandby 10 priority
• Bstandby 10 preempt
• Cstandby 10 track
• Dstandby 10 timers

Explanation

HSRP Preempt Explanation

Option B (standby 10 preempt) is correct because the preempt command allows a router to actively reclaim the HSRP active (forwarding) role when it has a higher priority than the current active router, or when the current active router goes down. Without preempt, Edge-02 would remain in standby even if it had a higher priority or Edge-01 recovered.

Why the distractors are wrong:

• A (standby 10 priority) sets a router's priority value to influence which router becomes active, but alone it does not force a takeover - preempt is still required to act on that priority.
• C (standby 10 track) is used to monitor an interface and automatically lower a router's priority if that interface fails, but it doesn't trigger a takeover by itself.
• D (standby 10 timers) adjusts hello and hold-down timers for HSRP, affecting how quickly a failure is detected, but does not control who takes over forwarding.

🧠 Memory Tip: Think of preempt as "pre-emptively jumping in" - it's the command that gives a router permission to act on its priority and seize the active role. No preempt = no takeover!

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