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As discussed in Chapter 15, "IPsec VPN," there are two major types of VPNs:
Secure VPN (also known as Cryptographic VPN): Secure VPN technologies include IPsec, L2TP over IPsec, and Secure Sockets Layer (SSL) encryption.
Trusted VPN (also known as non-Cryptographic VPN): Trusted VPN technologies include Multiprotocol Label Switching (MPLS) VPN (Layer 3 VPN), Multicast VPN (Layer 3 VPN), Transport of Layer 2 frames over MPLS, Any Transport over MPLS (AToM) (Layer 2 VPN), and virtual private LAN services (VPLS) (Layer 2 VPN).
Note
Secure VPN technologies are covered in Chapters 15, 16, 17, and 18. This section covers Trusted VPN technologies.
The major characteristic of Trusted VPN is based on the service provider offering a dedicated circuit or channel to a customer. Hence, pseudo point-to-point communication occurs in this scenario, allowing networks to peer directly using a dedicated circuit and providing a sense of security and data privacy. Traffic traversing this dedicated point-to-point circuit is called Trusted VPN.
In a Trusted VPN, security relies on the fact that the circuit provided by the service provider is not shared and is dedicated to a single site for point-to-point communication between specific customer sites.
Service providers today offer several Trusted VPN services. There are two major types of Trusted VPNs:
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