350-501 Question #436: Real Exam Question with Answer & Explanation

Question

A network engineer must collect traffic statistics for an internal LAN toward the internet. The sample must include the source and destination IP addresses the destination ports, the total number of bytes from each flow using a 64-bit counter and all transport flag information. Because of CPU limits, the flow collector processes samples that are a maximum of 20 seconds long. Which two configurations must the network engineer apply to the router? (Choose two.)

Options

• Acache timeout active 20
• Bcache-period timer active 20

Explanation

To limit NetFlow export duration for active flows to 20 seconds due to collector CPU limits, the router's NetFlow cache active timeout must be configured.

Common mistakes.

• B. The command cache-period timer active 20 is not a standard or valid configuration command for NetFlow on Cisco routers. The correct keyword for specifying the duration is timeout, not period timer.

Concept tested. NetFlow/IPFIX active timeout configuration

Reference. https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/netflow/configuration/xe-3s/nf-xe-3s-cr-book/nf-overview-xe.html

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