Read the question carefully. They want to know which port scanning technique you CANNOT
use because there is an IDS. In others words you will get caught if you use this one. The answer is C, TCP SYN will get flagged by the IDS all others are stealthy.
Slash its actually the reverse. TCP Scan is a stealth scan, but because this type of scan may be done out of malice, the IDS will pick it up and flag it. I still think the answer is C. Sorry about any confusion on my part.
From the CEH book:
-TCP Connect scan Disadvantages are.
✓ Easily detectable and filterable.
✓ Logs on the target system reveal the connection.
On the other hand:
-TCP SYN Advantages are:
✓ Bypasses firewall rules and logging mechanisms.
From the CEH book, about TCP Connect Scan: The drawback of this type of scan is that it is easily detectable and filterable. The logs in the target system will disclose the connection.
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