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I took the exam twice, and these questions were not even in the ballpark for the GSEC. A moderator may not show my comment here. These questions are ancient.
A. The SYN/FIN combination is useful for signaling to certain Trojans. This is not correct, as the SYN/FIN combination is not generally used to communicate with Trojans.
B. SYN/FIN packets are commonly used to launch denial of service attacks against BSD hosts. This is not correct, SYN/FIN packets are not a common method for DoS attacks.
C. The crafted SYN/FIN packet sometimes gets past firewalls and filtering routers. This is correct. SYN/FIN scanning utilizes crafted packets with both the SYN and FIN flags set to bypass firewall rules.
D. A SYN/FIN packet is used in session hijacking to take over a session. This is not correct, session hijacking typically involves predicting TCP sequence numbers, not using SYN/FIN packets.
So the correct option is C.
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