300-320 Question #552: Real Exam Question with Answer & Explanation

The correct answer is B: Use distribute-list. A distribute-list is the correct OSPF mechanism for filtering routes. In OSPF, a distribute-list is applied to control which routes are installed into the local routing table (inbound filtering) or advertised to neighbors, and it can reference an ACL or prefix-list to define what

Question

About interconnecting with new company, both companies uses OSPF and the questions is about how should you filter the ingress traffic between them

Options

AUse eigrp on the other company
BUse distribute-list
CUse prefix-list
DUse ACL

Explanation

A distribute-list is the correct OSPF mechanism for filtering routes. In OSPF, a distribute-list is applied to control which routes are installed into the local routing table (inbound filtering) or advertised to neighbors, and it can reference an ACL or prefix-list to define what to filter. While prefix-lists can be used as the matching criteria within a distribute-list, the distribute-list is the actual filtering mechanism applied to the OSPF process. Switching to EIGRP is unnecessary and disruptive. Using a plain ACL alone does not filter OSPF route advertisements.

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