Question 790
An organization wants to identify potential service exposure from an approved public perimeter capture. Which evidence most strongly validates the intended interpretation or control?
Explanation
Correct Answer
New service candidates are reported with source and destination metadata. This answer directly addresses the described constraint. Traffic analysis can reveal services not documented in current asset inventory. Successful validation requires: New service candidates are reported with source and destination metadata.
Incorrect Answers
It would address a firewall sends TCP RST responses to selected ports during discovery. The relevant reason in that case is: TCP resets distinguish a rejected connection from a no-response condition. Here the required success condition is new service candidates are reported with source and destination metadata. The relevant evidence is: New service candidates are reported with source and destination metadata.
This result applies to a different case: An assessor sees a TCP SYN-ACK from an in-scope host during a permitted probe. A SYN-ACK is evidence of a listening TCP service under ordinary conditions. It does not establish the present requirement, where new service candidates are reported with source and destination metadata. The relevant evidence is: New service candidates are reported with source and destination metadata.
That relates to a different issue: A site requires an inventory of TLS-enabled services without attempting authentication. TLS handshakes can describe certificate names and supported protocol families. That is not a direct remedy for the requested outcome: New service candidates are reported with source and destination metadata. The relevant evidence is: New service candidates are reported with source and destination metadata.