Implementing Cisco IP Routing (CCNP ROUTE, legacy) — Question 80

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.
• D. A large amount of IP traffic is being permitted on the router. C

Correct answer:

Explanation

The correct answer is C because when a packet matches an access list with the 'log' keyword, it requires additional processing to log the packet details, leading to process switching, which is CPU-intensive. Options A and B are incorrect because packets with the 'log' keyword cannot be efficiently switched via Cisco Express Forwarding or fast switching. Option D, while potentially true, does not specifically explain the CPU utilization issue caused by the logging feature.