CCNP/CCDP Switch (642-813) practice questions: MLS Caching

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Q6. Which of the following is true of MLS caching?

         A. The default aging time for MLS cache entry is 256 seconds.

        B. Aging time values are entered in 6-second increments.

        C. Candidate entries remain in the cache for 8 seconds, before timing out.

        D. The range of aging time value for MLS cache entry is 256 to 1024 seconds.

Correct Answer: A

Explanation: 

The following are true about aging of MLS cache entries:
1. Candidate entries live for 5 seconds (when no enable entry is made, this happens when the packet did not make it through the router).
2. By default, the aging time for a cache entry is 256 sec. A cache entry is deleted after this time period, if no flow is detected.
3. Aging time values are entered in 8-second increments. Any value that is not a multiple of 8 is adjusted to the closest multiple of 8.
4. The aging tie can range from 8 to 2032 seconds, the default being 256 seconds.

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