MPLS VPNs transport layer 2 packets across the network and encapsulate transport protocols such as ATM, Ethernet, and SONET, allowing MPLS networks to seemlessly upgrade and replace legacy layer 2 networks without requiring network reconfiguration or using protocols higher than layer 2. In comparison, layer 3 VPNs must use the layer 3 Internet Protocol (IP).

An Internet T1 connection can support up to hundreds of desktop computers depending upon the applications and bandwidth being utilized.

Many VoIP service providers guarantee that phone calls will not travel over the public Internet, but are converted and transmitted over the traditional telephone network directly from the VoIP provider's private Internet network that usually adheres to a defined Quality of Service (QoS).

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Multiprotocol Label Switching (MPLS) is a data communication standard that creates separate data paths for specific sequences of packets. Each packet is identified by a label that is encapsulated into each packet. This eliminates the need for Internet Protocol (IP) routers to look up the IP address of the next router in the network in order to forward the packet and as a result, speeds up the network.

Ethernet is the most widely-used data network protocol today. Standardized as IEEE 802.3, the Ethernet protocol is used for local area networks (LANs) at the Layer 1 (Physical Layer) and Layer 2 (Data Link Layer) of the OSI networking model.

Digital Subscriber Line (DSL) is a voice and data access service that supports both voice and data communication across a copper plain old telephone serivce (POTS) line and significantly increases the digital capacity of analog POTS access lines.

On Telecom Links, you can learn how an Internet T1 works and why it is more reliable than DSL or cable.

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Layer 2 MPLS VPNs (L2VPNs) are similar to Frame Relay, Asynchronous Transfer Mode, or point-to-point Wide Area Networks (WANs).