200-301 Question #934: Real Exam Question with Answer & Explanation

Question

Refer to the exhibit. After configuring a new static route on the CPE, the engineer entered this series of commands to verify that the new configuration is operating normally. When is the static default route installed into the routing table?

Options

• Awhen 203.0.113.1 is no longer reachable as a next hop
• Bwhen the default route learned over external BGP becomes invalid
• Cwhen a route to 203.0.113.1 is learned via BGP
• Dwhen the default route over external BGP changes its next hop

Explanation

The static default route is installed into the routing table only when the dynamically learned default route from external BGP becomes invalid or is no longer available.

Common mistakes.

• A. The reachability of the next hop 203.0.113.1 is a prerequisite for the static route to be valid itself, but it does not determine its precedence over an existing BGP default route.
• C. Learning a route to the next hop 203.0.113.1 via BGP would ensure reachability, but it would not cause the static default route to be installed if a BGP-learned default route is already active and valid.
• D. A change in the next hop for the BGP-learned default route would typically result in an update to the existing BGP route, not necessarily its invalidation or the installation of a higher administrative distance static route.

Concept tested. Floating static routes and administrative distance

Reference. https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_static/configuration/xe-16/irs-xe-16-book/irs-xe-static-ip-routes.html

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