Which option is used to perform a SYN scan in hping3?

Which option is used to perform a SYN scan in hping3?

• A. -S
• B. -A
• C. -1
• D. -2

Answer: (A)

SYN scan behavior is about sending a TCP packet that asks to open a connection but doesn’t complete the handshake. You do this by setting the SYN flag in the TCP header. In hping3, enabling that flag is done with the option that activates the SYN bit, which is -S (often written as --syn). When you send these SYN packets to a range of ports, you’ll see open ports respond with SYN-ACK, closed ports respond with RST, and filtered ports may drop the packets or not respond at all, allowing you to map the target’s port state without establishing a full connection. The other options don’t set the SYN flag. For example, a flag that sets the ACK bit won’t initiate a SYN-based half-open handshake, and -1 or -2 aren’t used to configure a SYN scan in this context.

SYN scan behavior is about sending a TCP packet that asks to open a connection but doesn’t complete the handshake. You do this by setting the SYN flag in the TCP header. In hping3, enabling that flag is done with the option that activates the SYN bit, which is -S (often written as --syn). When you send these SYN packets to a range of ports, you’ll see open ports respond with SYN-ACK, closed ports respond with RST, and filtered ports may drop the packets or not respond at all, allowing you to map the target’s port state without establishing a full connection.

The other options don’t set the SYN flag. For example, a flag that sets the ACK bit won’t initiate a SYN-based half-open handshake, and -1 or -2 aren’t used to configure a SYN scan in this context.