1. Which two functions are performed at the MAC sublayer of the OSI data link layer? (Choose two.) (Option A)
- Implements a trailer to detect transmission errors.
- Controls the NIC responsible for sending and receiving data on the physical medium.
- Places information in the frame that identifies which network layer protocol is being used for the frame.
- Adds Layer 2 control information to network protocol data.
- Enables IPv4 and IPv6 to utilize the same network interface and media.
Answers Explanation & Hints: The two functions performed at the MAC sublayer of the OSI data link layer are:
- Implements a trailer to detect transmission errors. The MAC sublayer is responsible for detecting transmission errors that may occur during the transmission of data frames. It adds a trailer to the frame, which contains a checksum or cyclic redundancy check (CRC) value that is used to detect errors.
- Controls the NIC responsible for sending and receiving data on the physical medium. The MAC sublayer is responsible for controlling the network interface controller (NIC) to send and receive data on the physical medium. It manages the transmission of data frames between devices by adding MAC addresses to frames, detecting and correcting transmission errors, and controlling the flow of data.
2. Which two functions are performed at the MAC sublayer of the OSI data link layer? (Choose two.)
(Option B)
- Provides a mechanism to allow multiple devices to communicate over a shared medium.
- Controls the NIC responsible for sending and receiving data on the physical medium.
- Places information in the frame that identifies which network layer protocol is being used for the frame.
- Adds Layer 2 control information to network protocol data.
- Communicates between the networking software at the upper layers and the device hardware at the lower layers.
Answers Explanation & Hints: - Provides a mechanism to allow multiple devices to communicate over a shared medium. The MAC (Media Access Control) sublayer manages how multiple devices share a single physical medium, like a coaxial cable or wireless frequency band. It controls access to the medium and prevents multiple devices from transmitting at the same time, which could result in collisions and lost data.
- Controls the NIC responsible for sending and receiving data on the physical medium. The MAC sublayer manages the network interface controller (NIC), which is responsible for transmitting and receiving data on the physical medium. It controls the timing and sequencing of data transmissions and receptions, and manages the data link layer framing and error detection functions.
3. Which two functions are performed at the MAC sublayer of the OSI data link layer? (Choose two.)
(Option C)
- Controls the NIC responsible for sending and receiving data on the physical medium.
- Integrates various physical technologies.
- Communicates between the networking software at the upper layers and the device hardware at the lower layers.
- Adds Layer 2 control information to network protocol data.
- Places information in the frame that identifies which network layer protocol is being used for the frame.
Answers Explanation & Hints: The two functions performed at the MAC sublayer of the OSI data link layer are:
- Controls the NIC responsible for sending and receiving data on the physical medium. The MAC (Media Access Control) sublayer manages the network interface controller (NIC), which is responsible for transmitting and receiving data on the physical medium. It controls the timing and sequencing of data transmissions and receptions, and manages the data link layer framing and error detection functions.
- Provides a mechanism to allow multiple devices to communicate over a shared medium. The MAC sublayer manages how multiple devices share a single physical medium, like a coaxial cable or wireless frequency band. It controls access to the medium and prevents multiple devices from transmitting at the same time, which could result in collisions and lost data.