CCDE: Cisco Certified Design Expert (Practical) — Question 274

How must the queue sizes be designed to ensure that an application functions correctly?

Answer options

• A. The default queue sizes are good for any deployment as it compensates the serialization delay.
• B. The queuing delay on every device in the chain must be exactly the same to the application required delay.
• C. Each individual device queuing delay in the chain must be less than or equal to the application required delay.
• D. The sum of the queuing delay of all devices plus serialization delay in the chain must be less than or equal to the application required delay.

Correct answer: D

Explanation

Option D is correct because it accounts for the total queuing and serialization delays to ensure they do not exceed the application's required delay, which is critical for proper functionality. Options A and B are incorrect as they either generalize the adequacy of default sizes or require exact matching, which does not guarantee correct operation. Option C is also incorrect as it fails to consider the cumulative impact of delays across multiple devices.