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350-001 · Question #66
350-001 Question #66: Real Exam Question with Answer & Explanation
The correct answer is A: R4 would receive an update noting R3's higher cost to reach 172.30.1.0/24.. In EIGRP, when a successor route fails and a feasible successor is not available via the failed interface, the router recalculates and advertises an updated metric to downstream neighbors.
Question
Refer to the exhibit. Assuming that the routing protocol for this network is EIGRP, if the link between R1 and R3 failed, what would R4 receive from R3?
Exhibit
Options
- AR4 would receive an update noting R3's higher cost to reach 172.30.1.0/24.
- BR4 would not receive any updates or queries, since R3 would simply move to the path through
- CR4 would receive a query, since R3 would mark 172.30.1.0/24 as active when the link between
- DR4 would not receive any packets, since R3 is not using the link to R1 to reach 172.30.1.0/24.
Explanation
In EIGRP, when a successor route fails and a feasible successor is not available via the failed interface, the router recalculates and advertises an updated metric to downstream neighbors.
Common mistakes.
- B. EIGRP does not silently switch paths without notifying downstream neighbors; any change in metric or next-hop triggers an update.
- C. R3 would only send a query and mark the route as Active if it had no feasible successor; a query is not the only possible outcome described by the scenario.
- D. R3 is the router whose link failed, so it must find a new path and propagate changes to R4 rather than staying silent.
Concept tested. EIGRP feasible successor and route update behavior
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