Which two functions are performed at the MAC sublayer of the OSI Data Link Layer to facilitate Ethernet communication? (Choose two.)
- handles communication between upper layer networking software and Ethernet NIC hardware
- implements trailer with frame check sequence for error detection
- places information in the Ethernet frame that identifies which network layer protocol is being encapsulated by the frame
- implements a process to delimit fields within an Ethernet 2 frame
- adds Ethernet control information to network protocol data
Case 2:
- places information in the Ethernet frame that identifies which network layer protocol is being encapsulated by the frame
- adds Ethernet control information to network protocol data
- responsible for internal structure of Ethernet frame
- enables IPv4 and IPv6 to utilize the same physical medium
- implements trailer with frame check sequence for error detection
Case 3:
- integrates Layer 2 flows between 10 Gigabit Ethernet over fiber and 1 Gigabit Ethernet over copper
- enables IPv4 and IPv6 to utilize the same physical medium
- handles communication between upper layer networking software and Ethernet NIC hardware
- adds Ethernet control information to network protocol data
- implements CSMA/CD over legacy shared half-duplex media
Case 4:
- applies delimiting of Ethernet frame fields to synchronize communication between nodes
- places information in the Ethernet frame that identifies which network layer protocol is being encapsulated by the frame
- adds Ethernet control information to network protocol data
- implements trailer with frame check sequence for error detection
- handles communication between upper layer networking software and Ethernet NIC hardware
Explanation: The OSI data link layer is divided into two sublayers: LLC and MAC. The MAC (Media Access Control) sublayer is responsible for data encapsulation and media access control. Its data encapsulation functions include frame delimiting, which uses bits to identify and synchronize fields within a frame, and error detection, which involves adding a trailer with a frame check sequence (FCS) to identify transmission errors. Other functions, such as identifying the network layer protocol or handling communication between upper-layer software and hardware, are performed by the LLC sublayer.
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