Which Two Functions Or Operations Are Performed By The Mac Sublayer? (Choose Two.)

In the OSI model, it consists of the seven-layer and MAC (media access control) is the sublayer of the data link layer which is the layer of the OSI model. To understand the MAC sublayer the information of the OSI model and its layers are important. The layer is in the following:

• Application layer.
• Presentation layer.
• Sessional layer.
• Datalink.
• Network layer.
• Transport layer.
• Physical layer.

The topic has information about the MAC layer because without it you would not be able to determine the answer to the question: Which functions are performed by the MAC sublayer?

MAC sublayer

MAC layer basic work is to handle the communication between data packets, the network interface card, and the remote channels, i.e., switch, router.MAC gives the addressing process and authority to the channels for transmission.

Functions of the MAC layers

The functions of the MAC layer are in the following:

• To provide the address to the destination station.
• Identification and frame delimiting.
• Error detection, and check the sequence of the frames
• Provide the addressing information of the source station
• Provide the controlling authority to the physical media.
• Transfer and receive the frames.
• Half-duplex transmission.
• Remove the damaged frames.
• Gap enforcement interframe.

What are the MAC Addresses?

The MAC address is specifically assigned to the NIC (network interface controller) of the device. In the data communication of the segments such as WIFI, Bluetooth is used as the network address. At the time of the development, the MAC address is designated. The model of the MAC address is that it is based on six groups of the two hexadecimal digits, which are on the distance with the help of the hyphens, colons, etc.

MAC layers protocols

some protocols are used by the MAC sublayer and they are given in the following section:

ALOHA:

The protocol is held responsible for the controlled access to the transmission channels. And ALOHA required something that can handle collision. Because if all the nodes tend to transmit the signals at the same time it causes a collision, and the frames may be lost during the collision.

CSMA 

The carrier sense multiple access which is used for the shared topologies i.e., ethernet, and unlike ALOHA the transmission occurs when there are no packets are in the queue. If the channel is sending the packets then the other packet has to wait for its turn to avoid the collision. There are the two types of CSMA which are listed below:

• CSMA/CD.

The collision detection gives the information of the event when the devices try to send the packets after getting the information that the channel is not in use. Then the collision occurs, the packets have to wait for some time and then resend.

• CSMA/CA.

In the CA the collision does not happen because the nodes have already been informed about the transmission.

What two functions or operations are performed by the MAC sublayer?

1. Work the NIC driver software function.
2. Responsible for MAC.
3. Top and bottom layer transmission.
4. Frame delimiting and recognition.

Option 2 and 4 are correct and the functions of the MAC layer have already been described above.