Which configuration forces Telnet traffic from 10.10.1.0/24 to host 10.10.10.10 (port 23) to use next-hop 10.4.4.4?
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Correct answer: access-list 100 permit tcp 10.10.1.0 0.0.0.255 host 10.10.10.10 eq 23 ! route-map POLICY permit 10 match ip address 100 set ip next-hop recursive 10.4.4.4.
Why this is the answer
The correct configuration uses an access-list to identify the specific traffic (Telnet from 10.10.1.0/24 to 10.10.10.10 port 23) and a route-map to apply a policy to that traffic. The access-list 100 permit tcp 10.10.1.0 0.0.0.255 host 10.10.10.10 eq 23 correctly matches the source network, destination host, and Telnet port. The route-map POLICY permit 10 match ip address 100 set ip next-hop recursive 10.4.4.4 then uses this access-list to match the traffic and sets the next-hop to 10.4.4.4. The recursive keyword is crucial because it allows the router to perform a recursive lookup for the 10.4.4.4 address, ensuring the next-hop is reachable. Without recursive, the router would need a direct route to 10.4.4.4, which is not always the case for policy-based routing. The route-map POLICY permit 20 is important to allow other traffic not matching the first statement to pass through the route-map without being dropped. The first incorrect option uses deny in the access-list, which would prevent the traffic from being matched by the route-map. The second incorrect option omits the recursive keyword, which could lead to routing failures if 10.4.4.4 is not directly connected. The third incorrect option is identical to the correct answer, but the provided prompt indicates only one correct answer.
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