300-320 Question #370: Real Exam Question with Answer & Explanation

The correct answer is B: Track 50 decrement 20. For Router 2 to preempt Router 1 in HSRP, Router 1's HSRP priority must fall below Router 2's priority when f0/1 goes down. Two commands are needed together: (D) 'ip track 50 interface f0/1 ip routing' (or line-protocol) defines tracked object #50, monitoring the state of f0/1. (

Question

HSRP. Router 1 (master) and Router 2 (standby), same priority. When router 1 f0/1 (outside interface) down. With which tracking commands the Router 2 will be able to preempt ? (Choose Two)

Options

ATrack 50
BTrack 50 decrement 20
Cip tracking 50 interface f0/1 reachability
Dip tracking 50 Interface f0/1 ip routing (or line protocol)

Explanation

For Router 2 to preempt Router 1 in HSRP, Router 1's HSRP priority must fall below Router 2's priority when f0/1 goes down. Two commands are needed together: (D) 'ip track 50 interface f0/1 ip routing' (or line-protocol) defines tracked object #50, monitoring the state of f0/1. (B) 'track 50 decrement 20' is applied under the HSRP group on Router 1, causing its HSRP priority to decrease by 20 when tracked object 50 fails. Since both routers start with the same priority, this decrement makes Router 1's priority lower, allowing Router 2 (which must also have 'standby X preempt' configured) to take over as active. Option A is incomplete (no decrement value), and option C uses incorrect syntax ('ip tracking' is not valid - the correct command is 'track').

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