Personal Area Network
Local Area Network
Virtual Private Network
Broadcast Network
Application level protocols
Tunnelling protocols
Network Protocols
Mailing Protocols
Radio And Radar Access services
Routing And Remote Access Services
Ranging And Radio Access Services
Remote Ranging Access Services
Remote Access Authentication Protocol
Right Apply Authentication Protocol
Real Access Authentication Protocol
Right Access Authentication Protocol
Easy to generate
Cannot be shared
Used for one Transaction only
Complex encrypted password