200-301 Question #902: Real Exam Question with Answer & Explanation

The correct answer is C: GigabitEthernet0/1. Routers use the longest prefix match rule to select the most specific route in their routing table when forwarding traffic to a destination IP address.

Submitted by sofia.br· Mar 5, 2026IP Connectivity

Question

Refer to the exhibit. Which interface is chosen to forward traffic to the host at 192.168.0.55?

Options

AGigabitEthernet0/3
BNull0
CGigabitEthernet0/1
DGigabitEthernet0/2

Explanation

Routers use the longest prefix match rule to select the most specific route in their routing table when forwarding traffic to a destination IP address.

Common mistakes.

B. A Null0 interface is typically used to discard traffic to prevent routing loops or for advertising aggregate routes, not to forward specific user traffic to a reachable host.
C. GigabitEthernet0/1 is associated with the 192.168.0.0/24 route. While this route matches the destination, it is less specific than the 192.168.0.0/26 route.
D. GigabitEthernet0/2 is associated with the 192.168.1.0/24 route, which does not match the destination IP address of 192.168.0.55.

Concept tested. Longest prefix match routing

Reference. https://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/23769-bgp-longest-match.html

Topics

#IP routing#Routing table lookup#Packet forwarding

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