350-501 · Question #436
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…
The correct answer is A. cache timeout active 20. 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.
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.)
Exhibits
Options
- Acache timeout active 20
- Bcache-period timer active 20
How the community answered
(30 responses)- A90% (27)
- B10% (3)
Why each option
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.
The `cache timeout active 20` command configures the NetFlow cache to export active flows every 20 seconds, ensuring that flow records are sent to the collector frequently enough to meet the 20-second processing limit. This setting prevents long-running flows from accumulating too much data before export.
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
Source: 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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