Question

question 7
which function or operation is performed by the llc sublayer?
it performs data encapsulation.
it adds a header and trailer to a packet to form an osi layer 2 pdu.
it communicates with upper protocol layers.
it is responsible for media access control.

Explanation:

The Logical Link Control (LLC) sublayer of the Data - Link layer in the OSI model is mainly responsible for providing a means to communicate with upper - layer protocols. Data encapsulation and adding header/trailer to form Layer 2 PDU are more general Data - Link layer functions, and media access control is the function of the MAC sublayer.

Answer:

C. It communicates with upper protocol layers.