What is the port number and give some example?
- A port number is a way to identify a specific process to which an Internet or other network message is to be forwarded when it arrives at a server. For the Transmission Control Protocol and the User
- Datagram Protocol, a port number is a 16-bit integer that is put in the header appended to a message unit.
▪ FTP-File Transfer Protocol (TCP-20,21)
▪ SSH-Secure Shell SSH Secure Login (TCP-22)
▪ Telnetremote login service, unencrypted text messages (23)
▪ SMTP-Simple Mail Transfer Protocol E-mail routing (TCP-25)
▪ DNS-Domain Name System(TCP/UDP-53)
▪ DHCP-Dynamic Host Configuration Protocol IP-(67server)-68(client).
▪ HTTP-Hypertext Transfer Protocol (TCP-80) used in the World Wide Web (TCP-80)
▪ POP3-Post Office Protocol POP3 (TCP-110)
▪ NTP-Network Time Protocol (UDP-123)
▪ SNMP-Simple Network Management Protocol (UDP-161/162)
▪ HTTPS- Secure (HTTPS) HTTP over TLS/SSL(TCP-443)
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