Security Protocol Protocol is a set of rules for communicating one & another PCs in public & private network. There are various types of Security Protocol for specific purposes as communication Protocol, Security Protocol 1 FTP- It is called as file transfer Protocol with port number as 25 & its used for downloads 2 HTTP It is called as Hyper text transfer Protocol with port number as 80 & its used for communicating information on www i.e used for internet access 3 SMTP It is called as Simple mail transfer Protocol & its used for communicating via email on www i.e used for internet access