How VPN Works

 ⚫This process is called tunneling as it uses a secure means to tunnel through a publicly accessible network

⚫It uses encryption involves the use of private and / or public keys 

⚫scrambles data so that only the key holder can decrypt / understand it

⚫data remains encrypted throughout transmission and is only decrypted at

the destination computer

⚫It can use IPsec  Internet Protocol Security

⚫is a network protocol suite that encrypts packets of data sent over a

network 

⚫protects data flows between a pair of hosts (host-to-host)

⚫ It uses a firewall which (monitors and) controls the incoming and outgoing network traffic 

⚫establishes a barrier between a trusted, secure internal network and

another outside network or computer

⚫It uses authentication, authorization, and accounting / AAA «

⚫AAA server is a program that handles user requests for access to

computer resources «

⚫AAA server typically interacts with network access and gateway servers /

with databases and directories containing user information

⚫It can use TLS / SSL «

⚫« uses asymmetric encryption to establish the session «

⚫« symmetric encryption for the main conversation.