Prerequisites for Configuring NetFlow and NetFlow Data Export
Before you enable NetFlow:
Configure the router for IP routing.
Ensure that one of the following is enabled on your router, and on the interfaces that you want to configure NetFlow on: Cisco Express Forwarding (CEF), distributed CEF, or fast switching.
Understand the resources required on your router because NetFlow consumes additional memory and CPU resources.
C - CEF is needed, not optional. ACL is optional.
From the link below they show a basic configuration with traceback, no ACLs were configured:
https://www.cisco.com/c/en/us/support/docs/ip/access-lists/13608-21.html#anc119
A is correct.
"Classification ACLs are a component of ACLs and require pre-planning to identify specific traffic and manual intervention during analysis."
https://www.cisco.com/c/en/us/support/docs/ip/access-lists/13608-21.html#anc121
The answer should be C as cef is a prerequisite for netflow and never seen a classification acl within netflow.
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/netflow/configuration/xe-3s/nf-xe-3s-book/cfg-nflow-data-expt-xe.html
I believe it should be C aswell.
Ensure that one of the following is enabled on your router, and on the interfaces that you want to configure NetFlow on: Cisco Express Forwarding (CEF), distributed CEF, or fast switching.
Well I am not sure it is C anymore. I believe it is a tricky question and I would go for A.
CEF is a prerequisite for Netflow as stated by elroy999.
However, the question says "Which ADDITIONAL configuration is required for Netflow..." which implicit means Netflow is already working properly (so prerequesites as CEF are already met).
And the link provided by Penguin is specifically on traceback:
Traffic Identification and Traceback
At times, you can need to quickly identify and traceback network traffic, especially during incident response or poor network performance. NetFlow and Classification ACLs are the two primary methods to accomplish this with Cisco IOS software. NetFlow can provide visibility into all traffic on the network. Additionally, NetFlow can be implemented with collectors that can provide long-term trending and automated analysis. Classification ACLs are a component of ACLs and require pre-planning to identify specific traffic and manual intervention during analysis. These sections provide a brief overview of each feature.
I believe A is the correct answer.
"you can need to quickly identify and traceback network traffic, especially during incident response or poor network performance. NetFlow and Classification ACLs are the two primary methods to accomplish this with Cisco IOS software. NetFlow can provide visibility into all traffic on the network.", so ACL and Netflow are 2 independent methods; and CEF is a prerequisite for Netflow..so I guess is C.
I agree, after reviewing https://www.cisco.com/c/en/us/support/docs/ip/access-lists/13608-21.html#anc119
upvoted 2 times
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