In networking and communications, the formats, codes and procedures for transmitting a unit of data (frame, packet) from one node to another. Known as a "layer 2 protocol," the data link protocol ...

On a shared medium, data link addresses are unique within the medium. In the enterprise, data link protocols provide functions such as finding a path and managing parallel paths.

What protocol does my ISP (Verizon) use at the data link layer to transport them? Google has not been much help so far.

Layer 2 functions occur before an IP-based connection is ever established, so all of your Layer 3 troubleshooting skills, tools, and protocols are useless here.

A protocol stack is a prescribed hierarchy of software layers, starting from the application layer at the top (the source of the data being sent) to the data link layer at the bottom (transmitting ...