350-501 · Question #309
A network engineer is implementing NetFlow to observe traffic patterns on the network. The engineer is planning to review the patterns to help plan future strategies for monitoring and preventing…
The correct answer is B. ip cef. To ensure NetFlow captures detailed BGP next-hop flow information, Cisco Express Forwarding (CEF) must be globally enabled on the router using the ip cef command. CEF provides the necessary forwarding infrastructure for NetFlow to operate effectively with such details.
Question
A network engineer is implementing NetFlow to observe traffic patterns on the network. The engineer is planning to review the patterns to help plan future strategies for monitoring and preventing congestion as the network grows. If the captures must include BGP next-hop flows, which configuration must the engineer apply to the router?
Options
- Aip cef
- Bip cef
- Cip cef
- Dno ip cef
How the community answered
(30 responses)- A3% (1)
- B93% (28)
- D3% (1)
Why each option
To ensure NetFlow captures detailed BGP next-hop flow information, Cisco Express Forwarding (CEF) must be globally enabled on the router using the `ip cef` command. CEF provides the necessary forwarding infrastructure for NetFlow to operate effectively with such details.
This option is identical to B and therefore represents the correct action, assuming it enables CEF.
The `ip cef` command globally enables Cisco Express Forwarding (CEF) on the router. CEF is a prerequisite for many advanced NetFlow features, including the ability to capture and export detailed flow records that include information such as BGP next-hop. Without CEF enabled, NetFlow may not be able to gather this specific level of detail for traffic analysis.
This option is identical to B and therefore represents the correct action, assuming it enables CEF.
The `no ip cef` command would disable Cisco Express Forwarding. Disabling CEF would prevent NetFlow from collecting detailed information, including BGP next-hop flows, making it impossible to meet the stated requirement.
Concept tested: NetFlow requirements, Cisco Express Forwarding (CEF)
Source: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/fnetflow/configuration/xe-3s/fnf-xe-3s-book/fnf-overview.html
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