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Security Terminology

 

VPN Terminology

VPN Tutorial Guide

3DES

AES

Aggressive Mode

Authentication Header

Asymmetric Encryption

Authentication

Certification Authority

Data Integrity

DES

Diffie-Hellman

Digital Certificate

Dynamic IP addresses

Encryption

ESP

IKE Oakley & ISAKMP

IPSec

IPSec Quick Mode

L2TP

Main Mode

MD5

NAT-T

PFS

PKI

Policy-vs-Route-VPN

PPTP

Pre-Shared Key

Remote Access User

RSA

Security Association

Sha-1

Site to Site VPN

SSL VPN

Transform Sets

Tunnel mode and Transport mode

VPN client tunneling option

VPN Topologies

VPN Tunnel

 

IPsec Site-to-Site VPN

 

Site-to-Site VPN generally refers to two organisations that create a VPN tunnel connection between them to be able to securely share data over the internet. The two organisations would require IPsec VPN devices and an internet connection to be able to establish a VPN tunnel.

The VPN tunnel does not necessarily have to be over the internet. It is common to establish VPN tunnels on other transmission mediums, even within a local area network itself or a private leased line.

IPsec VPN tunnels support a number of different topologies depending on the requirements, which is covered within the VPN Topologies page.

Further Reading

Wikipedia's guide to VPN