https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst9300/software/release/16-5/configuration_guide/nmgmt/b_165_nmgmt_9300_cg/b_165_nmgmt_9300_cg_chapter_01000.html#:~:text=A%20comprehensive%20IP%20accounting%20feature%20that%20can%20be%20used%20to%20replace%20many%20accounting%20features%2C%20such%20as%20IP%20accounting%2C%20Border%20Gateway%20Protocol%20(BGP)%20Policy%20Accounting%2C%20and%20persistent%20caches.
it does not converge but does replacement....
Why not C? As others pointed out, Flexible Netflow goes beyond L4. One example is Netflow combined with ETA. Netflow is used to collect information about the SSL/TLS session.
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/sec_data_eta/configuration/xe-16-6/sec-data-encrypted-traffic-analytics-xe-16-6-book/sec-data-encrypted-traffic-analytics-xe-16-6-book_chapter_01.pdf
From this link, Flexible Netflow can include information from Layer 2.
https://www.cisco.com/c/en/us/td/docs/routers/ios/config/17-x/ntw-servs/b-network-services/m_fnf-l2-fields.pdf
B E https://content.cisco.com/chapter.sjs?uri=/searchable/chapter/content/en/us/td/docs/ios-xml/ios/fnetflow/configuration/15-sy/fnf-15-sy-book/fnf-fnetflow.html.xml
https://www.cisco.com/c/en/us/products/ios-nx-os-software/flexible-netflow/index.html
Cisco IOS Flexible NetFlow benefits:
Flexibility and scalability of flow data beyond traditional NetFlow
Customized traffic identification ( B )
Ability to focus and monitor specific network behavior
Ability to monitor a wider range of packet information, producing new information about network behavior ( look like C )
Enhanced network anomaly and security detection
Convergence of multiple accounting technologies into one accounting mechanism. ( E )
So its B,C,E
Flexible NetFlow extends the capabilities of traditional NetFlow by allowing the collection of Layer 2 header information.
Search for "match datalink" or "Layer 2" attributes:
https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst9300/software/release/16-5/configuration_guide/nmgmt/b_165_nmgmt_9300_cg/b_165_nmgmt_9300_cg_chapter_01000.html
Cisco IOS Flexible NetFlow benefits:
Flexibility and scalability of flow data beyond traditional NetFlow
Customized traffic identification
Ability to focus and monitor specific network behavior
Ability to monitor a wider range of packet information, producing new information about network behavior
Enhanced network anomaly and security detection
Convergence of multiple accounting technologies into one accounting mechanism
I found this:
"With Deep Packet Inspection, different layer data can be anazled from layer "2 to layer 7"
Ref: https://ipcisco.com/lesson/flexible-netflow/
So option C is wrong
B, E are correct
upvoted 3 times
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