200-301 Question #979: Real Exam Question with Answer & Explanation

Question

Refer to the exhibit. Which entry is the longest prefix match for host IP address 192.168.10.5?

Options

• A1
• B2
• C3
• D4

Explanation

This question requires identifying the most specific routing table entry that matches a given destination IP address.

Common mistakes.

• A. Entry 1 would represent a less specific route (shorter prefix) than Entry 2 if both match the destination.
• C. Entry 3 would represent a less specific route (shorter prefix) than Entry 2 if both match the destination.
• D. Entry 4 would represent a less specific route (shorter prefix) than Entry 2 if both match the destination.

Concept tested. Longest prefix match routing principle

Reference. https://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/23018-bgp-longest-match.html

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