OSI Model : Data Link Layer
Learning Objective 1
After completing this section, students should be able to describe the OSI Data Link Layer, and what it is used for.
This layer groups bits into frames which are send by the Physical Layer. This layer also adds some errors checking by adding checksums to the data sent by the Physical Layer. The checksums are used by the receiving Data Link Layer to verify that the data was correctly sent by the Physical Layer. Incorrect data frames are retransmitted by the Physical Layer.