Question

What are the default port numbers used for SMTP, FTP,DNS, DHCP, SSH?

Answer 1

Below are the default port numbers used for SMTP, FTP,DNS, DHCP, SSH

        Service      Port

1. SMTP          25
2. FTP             20 for data transfer and 21 for Connection established
3. DNS            53
4. DHCP         67/UDP(for DHCP server, 68/UDPfor DHCP client
5. SSH            22