What is data link layer in OSI reference model? What is CRC? Explain.
The data link layer
is responsible for data framing, error control and physical addressing. When
data is received at this layer, the packet is "framed" for
transmission. A parity bit or a Cyclic Redundancy Check (CRC) field can be
added for data error checking. Each system, connected to the network has a
unique physical address. This address is usually "burnt-in" into the
computer’s network card. It is a physically established number and therefore
considered the computer’s physical address. Again, each system must have a
unique physical address. Sometimes, this physical address is referred to as the
Media Access Control (MAC) address.
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