What is Data link layer?

Answer 1

The Data Link Layer of OSI reference model provides the service of error detection and control to higher layers. It accomplishes this task by having the sender break input data into data frames and transmit sequentially and process acknowledgement frames.

It have two sub layers:-
1. Logical Link Control sublayer
2. Media Access Control sublayer

Answer 2

Essentially, you don't ... the data link layer is used by the underlying protocol of the LAN. If it is an Ethernet network then the frame is constructed as an Ethernet frame in layer 2. If you are using Token Ring, then you get a Token Ring frame, etc.

Answer 3

Data Link Layer, this layer is where we actually assign meaning to the electrical signals in the network. The layer also determines the size and format of data sent to printers, and other devices. Also I don't want to forget that these are also called nodes in the network. Another thing to consider in this layer is will also allow and define the error detection and correction schemes that insure data was sent and received.

Answer 4

Data link layer provides reliable communication of a packet by using services of the physical layer which transmits bits over the medium in an unreliable fashion. Data Link Layer, this layer is where we actually assign meaning to the electrical signals in the network.