350-401 Question #1107: Real Exam Question with Answer & Explanation

Question

Refer to the exhibit. An engineer must modify the existing configuration so that R2 can take over as the primary router when serial interface 0/0.1 on R1 goes down. Which command must the engineer apply?

Options

• AR2# standby 100 preempt
• BR2# standby 100 priority 100
• CR2# standby 100 track 26 decrement 10
• DR2# track 26 interface Serial0/0.1 line-protocol

Explanation

To enable R2 to become the active HSRP router when R1's serial interface fails and its priority drops, preemption must be configured on R2.

Common mistakes.

• B. standby 100 priority 100 sets R2's priority, which is part of HSRP configuration, but it does not, by itself, allow R2 to take over as active if R1's priority drops; preemption is required for that.
• C. standby 100 track 26 decrement 10 would configure R2 to track an interface and decrement its own priority, which is not the mechanism for R2 to take over when R1's interface fails.
• D. track 26 interface Serial0/0.1 line-protocol is a global tracking command and would typically be configured on R1 to monitor its own interface, defining what is tracked but not the HSRP behavior on R2.

Concept tested. HSRP preemption and interface tracking

Reference. https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipapp_fhrp/configuration/xe-16/fhrp-xe-16-book/fhrp-hsrp.html

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