JN0-102 Question #255: Real Exam Question with Answer & Explanation

The correct answer is D. Apply an export policy to OSPF that injects the static routes into OSPF.. To advertise static routes into OSPF, an export policy must be applied to OSPF, specifically identifying and permitting the static routes for redistribution.

Routing Policy and Firewall Filters

Question

There are three static routes in the routing table that need to be announced to your OSPF peers. Which method is used to accomplish this?

Options

AApply an import policy to OSPF that injects the static routes into OSPF.
BApply an import policy to the static routes that injects the static routes into OSPF.
CApply an export policy to the static routes that injects the static routes into OSPF.
DApply an export policy to OSPF that injects the static routes into OSPF.

Explanation

To advertise static routes into OSPF, an export policy must be applied to OSPF, specifically identifying and permitting the static routes for redistribution.

Common mistakes.

A. An import policy on OSPF governs which routes OSPF receives and installs into its own routing table from its neighbors, not which routes it originates or advertises from other sources like static routes.
B. Routing policies are applied to routing protocols, not directly to static routes themselves; static routes are entries in the routing table that can be matched by policies.
C. Routing policies are applied to a routing protocol (like OSPF) to influence its export behavior, not to the source of the routes (like static routes). Static routes are simply the data that the OSPF export policy would match against.

Concept tested. Route Redistribution Static to OSPF

Reference. https://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/16448-ospf-static.html

Topics

#static routing#OSPF#routing redistribution#export policy

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