Chapter 16. VPNs, Tunneling, and Overlay Networks
Moving on to layers 3 and 4 of the protocol reference model, this chapter introduces some special-purpose networking features: how networks can be overlaid or tunneled. In networking, tunneling is the encapsulation of a packet from one protocol to another one at the same or higher layer. Among application-specific communication networking cases, virtual private networks (VPNs) and multiprotocol label switching (MPLS) networks are two important and popular ones discussed in this chapter. These two network infrastructures can also be tied together for certain applications. The topics covered in of this chapter are
• Virtual private networks (VPNs)
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