Exam4Training

Which statement about the output of the show flow-sampler command is true?

Refer to the exhibit.

Which statement about the output of the show flow-sampler command is true?
A . The sampler matched 10 packets, each packet randomly chosen from every group of 100 packets.
B . The sampler matched 10 packets, one packet every 100 packets.
C . The sampler matched 10 packets, each one randomly chosen from every 100-second interval.
D . The sampler matched 10 packets, one packet every 100 seconds.

Answer: A

Explanation:

The sampling mode determines the algorithm that selects a subset of traffic for NetFlow processing. In the random sampling mode that Random Sampled NetFlow uses, incoming packets are randomly selected so that one out of each n sequential packets is selected on average for NetFlow processing. For example, if you set the sampling rate to 1 out of 100 packets, then NetFlow might sample the 5th, 120th, 199th, 302nd, and so on packets. This sample configuration provides NetFlow data on 1 percent of total traffic. The n value is a parameter from 1 to 65535 packets that you can configure.

Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_0s/feature/guide/nfstatsa.html#wp1084291

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