Question

question 33 which two functions are performed at the mac sublayer of the osi data link layer? (choose two.) enables ipv4 and ipv6 to utilize the same network interface and media. places information in the frame that identifies which network layer protocol is being used for the frame. implements a trailer to detect transmission errors. controls the nic responsible for sending and receiving data on the physical medium. adds layer 2 control information to network protocol data.

Explanation:

The MAC sub - layer of the OSI data link layer is responsible for placing information in the frame to identify the network layer protocol (logical link control coordination). It also controls the NIC for data sending and receiving on the physical medium as it deals with physical access to the network. Enabling IPv4 and IPv6 to use the same interface is not a MAC sub - layer function. Implementing a trailer for error detection is more of a function of the LLC sub - layer or the physical layer in some aspects. Adding Layer 2 control information is a more general data - link layer function not specific to MAC sub - layer.

Answer:

Places information in the frame that identifies which network layer protocol is being used for the frame.
Controls the NIC responsible for sending and receiving data on the physical medium.