The best way to think of the Data Link Layer is stacks of defined protocols on a single network. It’s delivering data frames across nodes on the same segment of a network, from the Physical Layer to the Network Layer as requested, guided by the well-established protocols. These protocols handle how data is passed between physical interfaces on the local network. The Data Link Layer is mostly code automated with little dependency on physical components beyond interfaces until proprietary technology or fiber optic switching comes into play. When the Network Layer needs something from the Physical Layer the Data Link layer acts as the broker. Another cool way to think of the Data Link layer is it handles the job of interpreting physical signals, like pulses of light, and turning them into data.
Often terms from the Data Link Layer are misapplied to an assortment of physical network components. For example CAT5e/6 UTP network cables are often referred to as “Ethernet cables”. Ethernet is the most famous root Data Link Layer protocol.
ZTSµ micro can help you secure communications across a multiple protocols and connections including those required for S/MIME and secure HTTP encryption, EDI Communications and associated Ethernet based protocols. Contact us for responsive, confidential consultation. Call (984) 224-6767