How do the four different Nmap port scanning types relate to the three-way handshake? Is there a better one than the Nmap port scan type?
The four different Nmap port scanning types relate to the three-way handshake as follows:
The four different Nmap port scanning types (TCP connect, TCP SYN, TCP FIN, and TCP XMAS) all relate to the three-way handshake in the sense that they are all ways to establish a connection with a remote host. However, each of these scanning types has a different way of going about this process.
a) TCP connect is the most straightforward way to establish a connection. It simply tries to complete the three-way handshake with the remote host. If the handshake is successful, then the port is considered open. If the handshake is unsuccessful, then the port is considered closed.
b) TCP SYN is a bit more complicated. In this type of scan, the scanner does not complete the three-way handshake. Instead, it only sends the first SYN packet. If the remote host responds with a SYN-ACK packet, then the port is considered open. If the remote host responds with a RST packet, then the port is considered closed.
c) TCP FIN is a bit more aggressive than TCP SYN. In this type of scan, the scanner sends a FIN packet instead of a SYN packet. If the remote host responds with a RST packet, then the port is considered closed. If the remote host does not respond, then the port is considered open.
d) TCP XMAS is the most aggressive type of scan. In this type of scan, the scanner sends a FIN, URG, and PUSH packet. If the remote host responds with a RST packet, then the port is considered closed. If the remote host does not respond, then the port is considered open.
- They also relate to the three-way handshake in the sense that they are all used to find open ports on a target system.
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