Final answer:
Out of the given options, intrusion warning is the operation that is not included in the intrusion prevention process.
Therefore, the correct answer is: option D. Intrusion warning
Step-by-step explanation:
The primary functions of an intrusion prevention system include protocol identification and analysis, where the system identifies the protocol being used and examines it for any suspicious activity.
Feature matching and response processing, which involves comparing network traffic against a database of known threats and taking action if a match is found, and application data reassembly, which ensures that the data streams are reconstructed correctly to identify any potential threats hidden within the packets.
Intrusion warning typically falls under the category of intrusion detection systems (IDS), which are responsible for monitoring and alerting rather than the active prevention measures taken by an intrusion prevention system (IPS).