Multiple choice

What determines if the router implements a classless route lookup process?

  1. Child routes are present in the routing table.

  2. A classless routing protocol has been configured on the router.

  3. The command ip classless is enabled on the router.

  4. Multiple routes with different masks to the same destination are in the routing table.

  5. Routing table entries have a next-hop IP address and an exit interface for each child route.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A router implements classless route lookup when a classless routing protocol is configured. RIPv2, EIGRP, OSPF, and IS-IS are classless protocols that include subnet mask information in routing updates. The ip classless command controls forwarding behavior but doesn't determine the routing protocol's classless nature.

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