What are the main components of a VPN?

VirtualPrivate Network (VPN)consists offollowingmain components:

I. Network Access Server(NAS): ANAS server is responsiblefor setting up tunnels in a VPN that isaccesses remotely. It
maintains thesetunnels thatconnectclients to VPN.
II. Firewall :It is thesoftwarethatcreates barrier betweenVPN and public network. It protects the VPN frommaliciousactivity that
can be donefromthe outside network.
III. AAAServer:This isan authentication and authorization server thatcontrols theaccessand usage ofVPN. Foreach request to
use VPN, AAAserverchecks the user forcorrect permissions.
IV. Encryption :In a VPN,encryption algorithms protect theimportant private datafrommalicious users.