Which type of route will require a router to perform a recursive lookup?

Question:
Which type of route will require a router to perform a recursive lookup?

• an ultimate route that is using a next hop IP address on a router that is not using CEF
• a level 2 child route that is using an exit interface on a router that is not using CEF
• a level 1 network route that is using a next hop IP address on a router that is using CEF
• a parent route on a router that is using CEF

Explanation: When Cisco Express Forwarding (CEF) is not being used on a router, a recursive lookup must be performed when a route using a next-hop IP address is selected as the best pathway to forward data.​

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