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 (also spelled Internet T-1) is a high-speed digitally transmitted connection to the Internet that transfers signals at 1.544 Mbps (1,544,000 bits per second) that can be divided into twenty-four 64 Kbps telephone lines or trunks.

Hosted Voice over Internet Protocol (VoIP) is a voice and data technology that supports several telecommunications protocols, such as Session Initiation Protocol (SIP) and Internet Protocol (IP), that that makes it easy for people to use the Internet to make telephone calls while saving money on premise hardware.

The ADSL downstream receiving rate from the Internet usually varies from 1.5 to 9Mbps while the upstream sending rate usually varies from 16 to 640 Kbps.

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MPLS works across various data protocols such as the Internet Protocol (IP), Asynchronous Transport Mode (ATM), and frame relay. MPLS forwards most packets at layer 2 (switching) instead of at layer 3 (routing) level.

Ethernet access to the Internet is quickly becomming a popular service. Ethernet, which is usually thought of as the protocol used to connect computers and servers on a local area network (LAN), is now increasingly being used across metropolitan wide area networks (WANS) to connect corporate LANs to the Internet. The advantage of Ethernet Internet Access service is that connection speeds that range from 1 Megabit per Second (Mbps) to 1 Gigabit per Second (Gbps) can be accessed via the same protocol being used on corporate LANs.

Digital Subscriber Line (DSL) connects end users (subscribers) to the Internet via a plain old telephone service (POTS) line that uses an existing copper pair but has been sped up by a Digital Subscriber Line Access Multiplexer (DSLAM) located at the service provider centeral office (CO) to form a continuous digital high-speed data connection from the customer premise to the Internet.

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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).