RAHUL

• Feb 3rd, 2014

 

protocol number and port number Both are same.

like

HTTP:-port number,80

Arshad

• Dec 27th, 2014

 

Os use some nos. to identify any protocol.These nos. are called port nos.

Lohit

• Apr 15th, 2016

 

Protocol works on L-4 and protocol no thus gives the information of which protocol is being used for sending data over the inter-network. Eg : ESP (protocol no 50), AH(protocol no 51), ICMP (protocol no 1), UDP (protocol no 17), TCP (protocol no 6)

Port no, on the other hand, is software based end point in an Operating system. Each port is assigned a number. It is called port number. A port number can be 0 to 65535. There are UDP and TCP port numbers in the same range.

For eg you can use Telnet services (port 23),SSH (port 22),HTTP (port 80),HTTPS (port 443)