350-501 Question #124: Real Exam Question with Answer & Explanation

Question

Refer to the exhibit. Which task completes the configuration?

Options

• ASpecify the maximum number of prefixes that R1 receives from neighbor 192.168.1.2.
• BSpecify the source interface in the neighbor statement.
• CSpecify the activate neighbor 192.168.1.2 under the IPv4 address family.
• DSpecify the local-as value in the neighbor statement.

Explanation

For a BGP neighbor defined globally under the BGP process, it must be explicitly activated within an address family to exchange routes for that family.

Common mistakes.

• A. Specifying the maximum number of prefixes is a control measure to prevent issues, not a fundamental step to complete basic BGP peering and route exchange.
• B. While update-source is good practice for BGP neighbor stability, especially when peering over loopbacks, it is not strictly necessary to complete the basic peering if the source interface can be inferred.
• D. Specifying a local-as value is typically used for AS-path manipulation in specific scenarios like private AS removal or AS override, not for the basic completion of a BGP peering session.

Concept tested. BGP Neighbor Activation

Reference. https://www.cisco.com/c/en/us/td/docs/ios/iproute_bgp/configuration/guide/irg_bgp.html

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