Is VPN all about encapsulating the source and destination IP address?

[shivajikobardan]

Homework Statement

VPN-Virtual Private Network

Relevant Equations

None

What’s encrypted here? Is the source and destination IP address encrypted? Is the firewall1 address and firewall2 address encrypted? Is the payload also encrypted?
Is this all what a VPN does? I can’t really believe that VPN only encapsulates and encrypts.
If it’s encrypting the source and destination IP address, is encapsulating with firewall address necessary? Because nobody is going to find about that.

I feel I'm missing some crucial information about the intricacy of VPN working. So, please guide.

 

[berkeman]

Where did you get those copyrighted diagrams? Do you own their copyright?

And you know that you need to post valid references and ask *specific* questions about those references. Start here for a basic intro:

https://en.wikipedia.org/wiki/Virtual_private_network

 

[shivajikobardan]

It's from the book "Cryptography and Network Security " by "Atul Kahate". I still don't get how is this about VPN? This looks about Firewalls.