Certified Information Systems Security Professional (CISSP) Practice Exam 2025 – All-in-One Guide to Mastering Your Certification!

The flag that indicates the packet contains urgent data is the Urgent flag. In the TCP header, the Urgent flag signifies that the data in the packet should be prioritized over other data segments. When this flag is set, it informs the receiving system that the data following the urgent pointer should be processed immediately, allowing for time-sensitive information, such as real-time communication or immediate system notifications, to be handled without delay.

The Urgent flag works in conjunction with the urgent pointer field in the TCP header, which tells the receiving end where the urgent data ends in the stream. This is especially useful in scenarios where rapid response is essential, such as in remote terminal sessions or other interactive applications.

While the Push flag is used to indicate that the sender has sent enough data that it should be immediately passed on to the receiving application, it does not pertain specifically to urgent data. The Synchronize flag is utilized as part of the connection establishment process during the TCP handshake, and the Finish flag is used to signal the end of a connection. Each has its unique purpose in the TCP protocol but does not denote urgency for the data contained in the packet.