Which two functions are performed at the LLC sublayer of the OSI Data Link Layer to facilitate Ethernet communication? (Choose two.)

Question:
Which two functions are performed at the LLC sublayer of the OSI Data Link Layer to facilitate Ethernet communication? (Choose two.)

• implements CSMA/CD over legacy shared half-duplex media
• enables IPv4 and IPv6 to utilize the same physical medium
• integrates Layer 2 flows between 10 Gigabit Ethernet over fiber and 1 Gigabit Ethernet over copper
• implements a process to delimit fields within an Ethernet 2 frame
• places information in the Ethernet frame that identifies which network layer protocol is being encapsulated by the frame

Other case

• responsible for internal structure of Ethernet frame
• applies source and destination MAC addresses to Ethernet frame
• 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

Other case

• adds Ethernet control information to network protocol data
• responsible for internal structure of Ethernet frame
• implements trailer with frame check sequence for error detection
• enables IPv4 and IPv6 to utilize the same physical medium
• applies source and destination MAC addresses to Ethernet frame

Other case

• implements CSMA/CD over legacy shared half-duplex media
• adds Ethernet control information to network protocol data
• places information in the Ethernet frame that identifies which network layer protocol is being encapsulated by the frame
• applies source and destination MAC addresses to Ethernet frame
• integrates Layer 2 flows between 10 Gigabit Ethernet over fiber and 1 Gigabit Ethernet over copper

Explanation: The data link layer is actually divided into two sublayers:

+ Logical Link Control (LLC): This upper sublayer defines the software processes that provide services to the network layer protocols. It places information in the frame that identifies which network layer protocol is being used for the frame. This information allows multiple Layer 3 protocols, such as IPv4 and IPv6, to utilize the same network interface and media.
+ Media Access Control (MAC): This lower sublayer defines the media access processes performed by the hardware. It provides data link layer addressing and delimiting of data according to the physical signaling requirements of the medium and the type of data link layer protocol in use.

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