A network engineer configures the ip route 10.1.1.0 255.255.255.0 s0/0/0 command on a router and then issues a show ip route command from enable mode. No routes for subnet 10.1.1.0/24 appear in the output. Which of the following could be true?
- The ip route command has incorrect syntax and was rejected in config mode.
- Interface s0/0/0 is down.
- The router has no up/up interfaces in Class A network 10.0.0.0.
- The ip route command is missing a next-hop router IP address.
Explanation: The ip route command can reference an outgoing interface or a next-hop IP address, and the command lists a next-hop IP address, which rules out one answer. The command does use the correct syntax, ruling out another answer. There is no requirement for a router to have any particular interface IP addresses in relation to the configuration of an ip route command, ruling out yet another answer.
The checks that IOS uses when looking at a new ip route command include whether the outgoing interface is up/up, whether the next-hop address is reachable, and, if there is a competing route from another source, whether the other route has a better administrative distance.
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