TELNET
It stands for Telecommunication Network , it is used for Log in to remote computer on the Internet.it provides unsecured connection. And it’s port number is 23.
FTP
It stands for File transfer Protocol , it is used to copy files from one host to another .it’s port number is 20/21.
HTTP
It stands for Hyper Text Transfer Protocol ,it is main protocol used by Web Browsers. it links multimedia files and it is a communication protocol. It is also called request and response protocol. And it’s port number is 80.
SMTP
It stands for Simple Mail Transfer Protocol, and it is used for transferring mail from source to destination. And it’s port number is 25.
DNS
It Stands for Domain Name System and it converts IP addresses in to Name. and it’s port number is 53.
POP
It Stands for Post Office Protocol and it is used for retrieving mail from the servers. And it’s port number is 110.
HTTPS
It is stands for hyper text transfer protocol Secure, it provides services like HTTP but it provides security also. It’s port number is 443.
TFTP
It stands for Trivial File Transfer Protocol and it is mostly used for read/write mails in remote servers. It transfers the file without authentication. It’s port number is 69.
PING
It stands for Packet internet Gopher, it is used for checking the connection status on the network .
SNMP
It stands for Simple Network Management Protocol, and it is used by Administrators as a network management . and it’s port number is 161/162.
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