300-320 Question #219: Real Exam Question with Answer & Explanation

The correct answer is D: EIGRP stub networks. Answer D is correct. EIGRP stub is a route filtering mechanism that prevents a stub (spoke) router from advertising transit routes or summary routes it should not propagate. This is widely used in hub-and-spoke Enterprise Campus designs to control which routes are redistributed a

Question

Which of the following features might be used by the Enterprise Campus network designer as a means of route filtering?

Options

AIPv4 static routes
BRoute tagging using a route map in an ACL
CTagging routes using the BGP MED
DEIGRP stub networks

Explanation

Answer D is correct. EIGRP stub is a route filtering mechanism that prevents a stub (spoke) router from advertising transit routes or summary routes it should not propagate. This is widely used in hub-and-spoke Enterprise Campus designs to control which routes are redistributed and advertised, effectively filtering the routing table at the spoke. Option A (static routes) is a routing tool, not a filtering tool. Option B describes route tagging, which is a marking mechanism used in conjunction with route maps, but the description combining it with an ACL for tagging is inaccurate as described. Option C (BGP MED) is a path-selection metric used between BGP peers, not a route filtering tool in the Campus context.

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