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

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

    • adds Ethernet control information to network protocol data
    • integrates Layer 2 flows between 10 Gigabit Ethernet over fiber and 1 Gigabit Ethernet over copper
    • handles communication between upper layer networking software and Ethernet NIC hardware
    • implements CSMA/CD over legacy shared half-duplex media
    • enables IPv4 and IPv6 to utilize the same physical medium

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