Networking author Howard C. Berkowitz provides tips on avoiding and fixing data link network failures in Part 3 of his series.

The Data Link Layer is one of my favorite layers of the OSI Model. Like a father who loves ALL of his children equally, but in different ways, I also love the other layers, but Layer 2 will always ...

Layer 2 is the Data link layer, which is not commonly discussed. The Network layer, layer 3, includes Internet Protocol (IP), which finds things on the network.

A case can be made for using an automated solution to test and troubleshoot the data link layer of these critical physical connections. But first the links and link types should be examined.

The internet is a complex network, and understanding how it works requires breaking it down into layers. In this video, we’ll ...

Data Link Layer The data link layer is responsible for transmitting packets of information across the link between hosts. If the link is shared by many hosts (for example, a LAN) this layer also ...

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 ...

Anyway some datalink layers used by ISPs: Ethernet, PPP, VPLS. It's mostly Ethernet- although cable companies use a different layer 2- Docsis. Wireless ISP might use 802.11 and other wireless L2.