VPN Security.

I understand what encapsulation is but i dont get the security part of tunneling. In a VPN where is the security when packets are encapsulated? How does it actually work? Is tunneling synonymous with VPN? When you add the tunnel source and destination....wat does that mean with regards to the data packets? Are source and destination fields changed?
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yolunga2000Asked:
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Rick_O_ShayCommented:
In a nutshell, the security part is that all of the user data is encrypted when crossing the untrusted, public part of the network. The VPNs at each end of the tunnel share secret keys that allow only themselves to encrypt/decrypt the data in the tunnel. There are other types of tunneling but the most common usage is for encrypted tunnels. The tunnel endpoint source and destination address are the addresses of each VPN on the public side and used to route the packets across the Internet. The private side addresses of the actual source and destination are inside the encrypted part of the packet.
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