Question

question 14 which two functions or operations are performed by the mac sublayer? (choose two.) it adds control information to network protocol layer data. it is responsible for media access control. it handles communication between upper and lower layers. it adds a header and trailer to form an osi layer 2 pdu. it performs the function of nic driver software.

Explanation:

The Media - Access Control (MAC) sublayer is part of the Data Link Layer (Layer 2) in the OSI model. Its main functions include media access control and adding control information to network - layer data. Handling communication between upper and lower layers is more of a general Layer 2 function not specific to MAC. Adding a header and trailer to form an OSI Layer 2 PDU is a function of the Data Link Layer as a whole, not just the MAC sublayer. Performing the function of NIC driver software is not a function of the MAC sublayer.

Answer:

It adds control information to network protocol layer data.
It is responsible for Media Access Control.