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).