The Data Link Layer is one of my favorite layers of the OSI Model. ... Physically, everything looked good, but I couldn’t seem to get the devices talking on the network.

Lying data link: Let multiple links appear as one. ... Larger or more complex networks tend to need network layer (OSI Layer 3) devices for speed and flexibility.

No matter what the data rate or distance of span, all of these links must be monitored and tested to ensure that both physical and data link layer functionality are within specification. Direct Attach ...