Which two fields are defined in the NetFlow flow? (Choose two.)

The Type of Service (ToS) byte, which conveys information about QoS and priority, is one of the key criteria used by NetFlow to define a unique flow, alongside other IP header fields.

While the Layer 4 protocol type is part of the 7-tuple, the specific field name 'Layer 4 protocol type' is generally covered by the protocol identifier, and ToS byte and Destination Port are more directly distinct fields in the standard 7-tuple key.

Class of Service (CoS) bits are primarily used in Layer 2 (Ethernet) frames for QoS within a local segment and are not a defining characteristic of a NetFlow flow, which operates at Layer 3/4.

The output logical interface, while recorded for flow statistics, is not part of the standard 7-tuple key used to *define* a flow itself, unlike the input interface.

The destination port number (e.g., TCP or UDP port) is a critical component of the 7-tuple key that NetFlow uses to distinguish one flow from another, identifying the specific application or service targeted.