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CCNA Practice Test - 9
Refer to the exhibit. The network administrator has discovered that packets destined for servers on the 172.16.254.0 network are being dropped by Router2. What command should the administrator issue to ensure that these packets are sent out the gateway of last resort, Serial 0/0/1?
The 'ip classless' command tells the router to forward packets destined for unknown subnets to the best available route, typically the default route (gateway of last resort). Without this command, if the router doesn't have an exact match for a destination subnet in its routing table, it drops the packet even if a default route exists. This was the default behavior in older IOS versions for classful routing. The command ensures the router uses classless routing behavior, forwarding packets for subnets it doesn't specifically know about to the default gateway.