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When conducting a nmap stealth (nmap -sS x.x.x.x -p 80) scan of a target on port 80, if the port is open, you will get a ____ response from the server.
SYN/ACK
RST
ACK
No response at all
An ICMP echo-reply
The nmap stealth scan, the -sS option (on by default) will send a SYN packet to the server at the specified port (-p 80). If the port is open, the server will respond with a SYN/ACK as the second part of the TCP 3-way handshake. Nmap would then send the server a RST to close the half open connection. If the port, 80 in this example, is closed, the server will send a RST instead.
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