Which statement is correct regarding NBAR and NetFlow?
A. NetFlow uses five key fields for the flow.
B. NBAR examines data in Layers 3 and 4.
C. NetFlow examines data in Layers 3 and 4.
D. NBAR examines data in Layers 2 through 4.
E. NetFlow examines data in Layers 2 through 4.
Correct is C
Netflow works between 3 and 4
Layer Flexible Netflow works from Layer 2 to 7 inspect payload
NBAR works 3 to 7
https://commons.wikimedia.org/wiki/File:Netflow_vs_nbar.png