To configure NetFlow when you already have source IP, destination IP, source port, and destination port, which additional fields are required? (Choose three.)

NetFlow uses a "key" to identify a flow, which traditionally includes seven fields. The question provides four of these: source IP, destination IP, source port, and destination port. To complete the traditional NetFlow key, three additional fields are required: Layer 3 Protocol type (e.g., TCP, UDP, ICMP), ToS (Type of Service) byte (now often called DSCP), and Input Logical Interface (the interface on which the packet entered the router). These seven fields uniquely identify a network flow. Encryption type, Hashing Algorithm, and Transform-set details are not part of the standard NetFlow key.