CREST Practitioner Security Analyst (CPSA) Practice

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Which of these is NOT a valid SIP request method?

NOTIFY
ACK
TRANSMIT
BYE

The correct answer is: TRANSMIT

The correct option, which is not a valid SIP (Session Initiation Protocol) request method, is TRANSMIT. SIP is used for initiating, maintaining, and terminating real-time sessions that involve video, voice, messaging, and other communications. The protocol defines several request methods, including: - NOTIFY: Utilized to provide information about changes in state or subscriptions. - ACK: Acknowledges the receipt of a response to a previous request, often used in the context of confirming session establishment. - BYE: Used to terminate a session or a call. TRANSMIT, however, is not recognized as a method within SIP specifications. This distinction is crucial for understanding the functions and capabilities of SIP and maintaining effective communication protocols.