300-410 Question #71: Real Exam Question with Answer & Explanation

Question

Refer to the exhibit. An engineer is trying to get 192.168.32.100 forwarded through 10.1.1.1, but it was forwarded through 10.1.1.2. What action forwards the packets through 10.1.1.1? router# show ip route D 192.168.32.0/19 [90/25789217] via 10.1.1.1 R 192.168.32.0/24 [120/4] via 10.1.1.2 O 192.168.32.0/26 [110/229840] via 10.1.1.3

Options

• AConfigure EIGRP to receive 192.168.32.0 route with lower admin distance.
• BConfigure EIGRP to receive 192.168.32.0 route with longer prefix than /19.
• CConfigure EIGRP to receive 192.168.32.0 route with lower metric.
• DConfigure EIGRP to receive 192.168.32.0 route with equal or longer prefix than /24.

Explanation

To ensure packets for 192.168.32.100 are forwarded via 10.1.1.1, the EIGRP route must be configured with a prefix length that is equal to or longer than the currently preferred /24 RIP route.

Common mistakes.

• A. Lowering EIGRP's administrative distance would only matter if the prefix lengths were equal; longest prefix match takes precedence over administrative distance.
• B. Configuring an EIGRP route with a prefix longer than /19 is a step in the right direction, but to specifically beat a /24 route, it needs to be equal to or longer than /24.
• C. Lowering the EIGRP metric is considered only after both prefix length and administrative distance have been evaluated; it would not override the preference for a longer prefix from another protocol.

Concept tested. Routing table lookup preference (longest prefix match)

Reference. https://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/26634-4.html

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