350-501 Question #418: Real Exam Question with Answer & Explanation

Question

Refer to the exhibit. A client wants to filter routes to a BGP peer to limit access to restricted areas within the network. The engineer configures the route map ciscotest to filter routes from the BGP neighbor. The engineer also sets a tag that will be used for QoS in the future. Which task must be performed to complete the implementation?

Options

• ACreate a route map, configure BGP with an IPv4 address family, and activate the neighbor.
• BAttach the new route map to the BGP neighbor statement in the inbound direction.
• CCreate a policy map named ciscotest and apply it to inbound traffic on the link that is directly
• DAdd a route map statement with sequence 40 that links a BGP community to the routing protocol.

Explanation

To apply a configured route map that filters BGP routes from a neighbor and sets a QoS tag, it must be explicitly attached to the BGP neighbor configuration in the appropriate direction.

Common mistakes.

• A. This option describes the initial BGP and route map creation steps, which the question implies have already been performed by the engineer configuring the route map. It does not describe how to apply the already created route map.
• C. Policy maps are used for QoS configuration, which is a different mechanism from BGP route filtering. While the route map might set a tag for future QoS, applying a policy map is not the action to complete BGP route filtering.
• D. Adding a new sequence to the route map is a modification to the route map itself, not the action that completes its application to the BGP neighbor for filtering purposes.

Concept tested. BGP route map application

Reference. https://www.cisco.com/c/en/us/td/docs/ios/iproute_bgp/command/bgp_c_reference/bgp_c2.html#wp1010079

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