Question

Can the responsibilities of the data link layer be handled at a higher level? Why or why not? Can the responsibilities of the data link layer be handled at a lower level? Why or why not?

Answer 1

`Hey,

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Data Link layer is the 2nd layer of the OSI model. It is used for the reliable transfer of data across data link being used. Data Link Layer gets the raw data from physical layer try to make physical link reliable and provides the methods to activate and maintain the link. It gives guarantee to the higher layers that data send by this layer will be free of errors. It attempts to detect and recover the data that it gets from physical layer.

It uses two protocols as HDLC and LLC for providing its services. HDLC is known as high Level Data link Control. It is used on point to point data links. It can also be used on multi point data links. We can use it in a number of different ways because it is a general purpose data link control protocol. LLC is known as Logical Link Control. Its function is to provide reliable transfer of data across the data link between two communication bodies.

By using unacknowledged connectionless service user can initiate the transfer of data service with minimum protocol overheads. By using connection oriented services user can establish a logical connection, before sending the transfer of any data service.

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