350-401 Network Assurance Practice Question
A network engineer is configuring a Cisco IOS router to export NetFlow data to a collector. The engineer wants to ensure that only ingress traffic on GigabitEthernet0/0 is monitored and that the NetFlow cache is optimized for high traffic volumes. Which configuration step is required to enable NetFlow on the interface?
⚠ Common exam trap
The trap here is thinking that global NetFlow export commands automatically enable flow capture on interfaces, but interface-level configuration is mandatory.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
ip flow ingress
To enable NetFlow on a specific interface for ingress traffic, the 'ip flow ingress' command must be configured in interface configuration mode. This command activates NetFlow accounting for packets entering the interface, allowing the router to collect flow statistics. The global export commands only define where and how to send the data, but the interface command is what starts the capture.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
ip route-cache flow
Why it's wrong here
'ip route-cache flow' is a legacy command used in older Cisco IOS versions to enable NetFlow. In modern IOS, the command is 'ip flow ingress' or 'ip flow egress'. Using the legacy command may not work on current platforms and is not the recommended method for enabling NetFlow on an interface.
- ✗
ip flow-export version 9
Why it's wrong here
'ip flow-export version 9' sets the NetFlow export format to version 9, which supports flexible record formats. However, it does not enable NetFlow on an interface. It is a global configuration command that must be paired with interface-level commands to actually capture and export flow data.
- ✓
ip flow ingress
Why this is correct
The 'ip flow ingress' command enables NetFlow accounting for ingress traffic on the interface. It is the correct command to start capturing flow data for incoming packets. This is a fundamental step in configuring NetFlow on a Cisco IOS router, and it must be applied to the interface that will be monitored.
- ✗
ip flow-export destination
Why it's wrong here
'ip flow-export destination' is used in global configuration mode to specify the NetFlow collector's IP address and port. It does not enable NetFlow on an interface; it only defines where the flow data should be sent. The interface still needs to be configured with 'ip flow ingress' or 'ip flow egress'.
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Cisco exam blueprint
This 350-401 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 350-401 exam.