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 ...

2) Data Link Layer This deals with addressing at the level of frames, acting as a link between the network layer (packets with IP addresses) and the physical layer (signals).

The data link layer (layer two) lists the functions that need to be facilitated to have reliable access to and delivery over a single physical link. This can be contrasted to the transport layer, ...

What is a network switch? A network switch is a physical device that operates at the Data Link layer of the Open Systems Interconnection (OSI) model — Layer 2.

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.

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.

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 ...

A glossary of essential networking terms with links to in-depth articles.