Which feature must be configured before implementing NetFlow on a router?

Question

Options

• ASNMPv3
• Bsyslog
• CVRF
• DIP routing

• A
  8% (2)
• B
  4% (1)
• D
  88% (21)

Explanation

IP routing must be enabled on a router before NetFlow can be configured, because NetFlow operates at Layer 3 and relies on the router actively making forwarding decisions to capture flow statistics - without IP routing enabled, the router has no traffic flows to monitor or export.

Why the distractors are wrong:

• A (SNMPv3): SNMP is used for network management and polling device stats, but it is not a prerequisite for NetFlow; the two can operate completely independently.
• B (syslog): Syslog handles event/log message forwarding and has no dependency relationship with NetFlow configuration.
• C (VRF): Virtual Routing and Forwarding is an optional feature for segmenting routing tables; NetFlow does not require VRF to function, though it can be configured per-VRF when VRF is in use.

Memory tip: Think of NetFlow as a traffic counter at a highway tollbooth - the highway (IP routing) must exist and be open before you can install the counter. No road, no traffic, no flow data.

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