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352-001 · Question #245
352-001 Question #245: Real Exam Question with Answer & Explanation
The correct answer is B: to find alternate loop-free paths that have been discarded due to split horizons. EIGRP sends Query packets when a router enters Active state and has no feasible successor, specifically to discover paths that neighbors possess but cannot advertise under normal split horizon rules.
Question
Why does EIGRP use queries?
Options
- Ato withdraw routing information from the network
- Bto find alternate loop-free paths that have been discarded due to split horizons
- Cto test known alternate paths and determine if they are loop-free
- Dto test for neighbor state when the network topology is in flux
Explanation
EIGRP sends Query packets when a router enters Active state and has no feasible successor, specifically to discover paths that neighbors possess but cannot advertise under normal split horizon rules.
Common mistakes.
- A. EIGRP withdraws routing information by sending Update packets with an infinite metric value, not Query packets; queries are used to seek paths, not to remove them.
- C. EIGRP does not test existing alternate paths via queries; loop-free alternates are pre-computed using the Feasibility Condition and stored as feasible successors in the topology table, making them immediately available without querying.
- D. EIGRP uses Hello packets to maintain neighbor liveness and adjacency state; queries serve the purpose of path discovery during Active state, not neighbor state verification.
Concept tested. EIGRP DUAL query process and split horizon interaction
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