What is the purpose of the data link layer?

A.
End-to-end connection

B.
Dialog control

C.
Framing

D.
Data syntax

Explanation:
C: The data link layer, in most cases, is the only layer that understands the environment in which the system is working, whether it be Ethernet, Token Ring, wireless, or a connection to a WAN link. This layer adds the necessary headers and trailers to the frame. Other systems on the same type of network using the same technology understand only the specific header and trailer format used in their data link technology.