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Refer to the exhibit.

An IPsec VPN tunnel is dropping, as shown by the debug output.

Analyzing the debug output, what could be causing the tunnel to go down?

"}}]]}],[["$","fieldset",null,{"className":"prose prose-sm prose-stone mx-auto max-w-[740px] space-y-4 rounded bg-muted/60 p-4 md:prose-base","children":[["$","label","v9nyzvr8Tz",{"className":"flex items-start gap-1.5 md:gap-2 p-4 rounded transition-all duration-300 cursor-pointer bg-white focus:bg-muted/50 focus:outline-none focus:ring-2 focus:ring-brand/40 has-[:checked]:bg-blue-100","htmlFor":"option-0","children":[["$","div",null,{"className":"flex items-center","children":[["$","input",null,{"type":"checkbox","id":"option-0","name":"option-0","className":"rounded-full size-3 md:size-3.5 transition-colors duration-300 appearance-none border border-gray-300 checked:bg-brand checked:border-brand focus:outline-none focus:ring-2 focus:ring-brand/40"}],["$","span",null,{"className":"ml-1.5 font-semibold md:ml-2.5","children":["A","."]}]]}],["$","div",null,{"className":"prose prose-sm prose-stone md:prose-base","dangerouslySetInnerHTML":{"__html":"

Phase 2 drops but Phase 1 is up.

"}}]]}],["$","label","qOGeae4D8K",{"className":"flex items-start gap-1.5 md:gap-2 p-4 rounded transition-all duration-300 cursor-pointer bg-white focus:bg-muted/50 focus:outline-none focus:ring-2 focus:ring-brand/40 has-[:checked]:bg-blue-100","htmlFor":"option-1","children":[["$","div",null,{"className":"flex items-center","children":[["$","input",null,{"type":"checkbox","id":"option-1","name":"option-1","className":"rounded-full size-3 md:size-3.5 transition-colors duration-300 appearance-none border border-gray-300 checked:bg-brand checked:border-brand focus:outline-none focus:ring-2 focus:ring-brand/40"}],["$","span",null,{"className":"ml-1.5 font-semibold md:ml-2.5","children":["B","."]}]]}],["$","div",null,{"className":"prose prose-sm prose-stone md:prose-base","dangerouslySetInnerHTML":{"__html":"

Dead Peer Detection is not receiving its acknowledge packet.

"}}]]}],["$","label","L9qXHLP4qH",{"className":"flex items-start gap-1.5 md:gap-2 p-4 rounded transition-all duration-300 cursor-pointer bg-white focus:bg-muted/50 focus:outline-none focus:ring-2 focus:ring-brand/40 has-[:checked]:bg-blue-100","htmlFor":"option-2","children":[["$","div",null,{"className":"flex items-center","children":[["$","input",null,{"type":"checkbox","id":"option-2","name":"option-2","className":"rounded-full size-3 md:size-3.5 transition-colors duration-300 appearance-none border border-gray-300 checked:bg-brand checked:border-brand focus:outline-none focus:ring-2 focus:ring-brand/40"}],["$","span",null,{"className":"ml-1.5 font-semibold md:ml-2.5","children":["C","."]}]]}],["$","div",null,{"className":"prose prose-sm prose-stone md:prose-base","dangerouslySetInnerHTML":{"__html":"

The tunnel drops during rekey negotiation.

"}}]]}],["$","label","KLS118Pb8K",{"className":"flex items-start gap-1.5 md:gap-2 p-4 rounded transition-all duration-300 cursor-pointer bg-white focus:bg-muted/50 focus:outline-none focus:ring-2 focus:ring-brand/40 has-[:checked]:bg-blue-100","htmlFor":"option-3","children":[["$","div",null,{"className":"flex items-center","children":[["$","input",null,{"type":"checkbox","id":"option-3","name":"option-3","className":"rounded-full size-3 md:size-3.5 transition-colors duration-300 appearance-none border border-gray-300 checked:bg-brand checked:border-brand focus:outline-none focus:ring-2 focus:ring-brand/40"}],["$","span",null,{"className":"ml-1.5 font-semibold md:ml-2.5","children":["D","."]}]]}],["$","div",null,{"className":"prose prose-sm prose-stone md:prose-base","dangerouslySetInnerHTML":{"__html":"

The tunnel drops after the timer expires.

"}}]]}]]}],["$","div",null,{"className":"mx-auto max-w-[740px]","children":["$","details",null,{"className":"group","children":[["$","summary",null,{"className":"flex h-10 w-fit cursor-pointer items-center justify-center gap-2 rounded-full bg-brand px-8 font-heading text-sm font-medium text-white hover:bg-brand/90","children":[["$","span",null,{"className":"group-open:hidden","children":"Show Answer"}],["$","span",null,{"className":"hidden group-open:inline","children":"Hide Answer"}]]}],["$","div",null,{"className":"prose prose-sm prose-stone mx-auto mt-4 max-w-[740px] overflow-hidden pb-6 pt-2 md:prose-base","children":[["$","span",null,{"className":"font-medium","children":"Correct Answer: "}],["$","p",null,{"children":""}]]}]]}]}]]]}],"$L28"]}]}]]

FCSS_NST_SE-7.4 Exam - Question 21

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