Implementing Cisco IP Routing (CCNP ROUTE, legacy) — Question 195

Refer to the following access list.
access-list 100 permit ip any any log
After applying the access list on a Cisco router, the network engineer notices that the router CPU utilization has risen to 99 percent. What is the reason for this?

Answer options

• A. A packet that matches access-list with the "log" keyword is Cisco Express Forwarding switched.
• B. A packet that matches access-list with the "log" keyword is fast switched.
• C. A packet that matches access-list with the "log" keyword is process switched.

Correct answer: A, I, P

Explanation

The correct answer is A because when the 'log' keyword is used, packets are processed in a way that requires more CPU resources, as they are logged. Options B and C are incorrect because fast switching and process switching do not involve logging and thus do not contribute to the high CPU utilization seen in this scenario.