Multiple choice

Refer to the exhibit. Router1 is running IOS version 12.2. What will the network administrator need to do so that packets for unknown child routes of 172.16.0.0/24 will not be dropped?

  1. Issue the IP default-network command

  2. Use a classful routing protocol such as RIPv1

  3. Enable either OSPF or ISIS as the routing protocol

  4. Issue the IP classless command

  5. Do nothing, IP classless is on by default
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The 'ip classless' command enables classless routing behavior, allowing the router to forward packets destined for unknown subnets of a major network to the best available supernet or default route. Without this command, older IOS versions would drop packets for unknown child routes. In IOS 12.2, 'ip classless' was not the default behavior and had to be enabled manually for proper route forwarding.

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