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300-320 · Question #209

300-320 Question #209: Real Exam Question with Answer & Explanation

The correct answer is A: EIGRP queries will be the most significant issue with respect to stability and convergence. Uncontrolled EIGRP query propagation is the dominant threat to stability and convergence in large EIGRP networks.

Question

Which of the following is true regarding the effect of EIGRP queries on the network design?

Options

  • AEIGRP queries will be the most significant issue with respect to stability and convergence
  • BEIGRP queries are not a consideration as long as EIGRP has a feasible successor with a next
  • CEIGRP queries will only increase the convergence time when there are no EIGRP stubs designed

Explanation

Uncontrolled EIGRP query propagation is the dominant threat to stability and convergence in large EIGRP networks.

Common mistakes.

  • B. Feasible successors prevent queries only locally on the router that holds them; queries can still propagate beyond neighbors that lack a feasible successor, so the query scope problem remains even with feasible successors present.
  • C. EIGRP stubs reduce query scope but are a mitigation technique, not an elimination of the problem; the statement incorrectly implies queries only matter when stubs are absent and ignores the broader convergence impact.

Concept tested. EIGRP query propagation and Stuck-in-Active impact on design

Reference. https://www.cisco.com/c/en/us/support/docs/ip/enhanced-interior-gateway-routing-protocol-eigrp/13676-19.html

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