In the OSI / ISO model, at what layer are some of the SLIP, CSLIP, PPP control functions are provided?

A.
Data Link

B.
Transport

C.
Presentation

D.
Application

Explanation:
The Data Link layer takes raw data from the physical layer and gives it logical structure. This logic
includes information about where the data is meant to go, which computer sends the data, and the
overall validity of the bytes sent. The Data Link layer also controls functions of logical network
topologies and physical addressing as well as data transmission synchronization and corrections.
SLIP, CSLIP and PPP provide control functions at the Data Link Layer (layer 2 of the OSI model).