This is the case when a user does not have raw packet privileges. TCP connect scan is the default TCP scan type when SYN scan is not an option. It is also relatively unobtrusive and stealthy, since it never completes TCP connections. It can be performed quickly, scanning thousands of ports per second on a fast network not hampered by restrictive firewalls. SYN scan is the default and most popular scan option, for good reasons.
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