Which statement is FALSE with respect to open ports?

Last Updated on August 1, 2021 by Admin 2

Which statement is FALSE with respect to open ports?

  • If it is listening, it is open
  • Ports use values that range between 1 and 65535.
  • Port 23 is FTP
  • If you send a TCP packet with the SYN flag set, you will receive one with the SYN and ACK flags back.
Explanation:
Port 23 is not used by FTP. It is used by Telnet. Although port numbers do have defaults set for well-known services, you can always change the port on which a service is running.

An open port is also called listening port in some instances. Open or listening ports have an available service running on them. It may or may not be the default service for that port. if the port is closed, it means a service is not available on that port.

Ports use values that range between 1 and 65535.

If you send a TCP packet with the SYN flag set, you will receive one with the SYN and ACL flags back if it is open. If it is closed, you will receive a packet with the RST flag set. If you receive no response, the port is filtered or blocked on the firewall.

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