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Module 2: Data Link Layer & MAC Sublayer

20222m

Which sublayer of the information link layer performs circuit functions that depend on the kind of medium?

(i) Media access control sublayer
(ii) Logical link control sublayer
(iii) Network interface control sublayer
(iv) Both (i) and (ii)

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(i) Media Access Control (MAC) sublayer

The Data Link layer is commonly split into two sublayers:

  • LLC (Logical Link Control): medium-independent — handles flow control, error control, and framing in a way that's the same regardless of the underlying physical medium (Ethernet, Wi-Fi, etc.).
  • MAC (Media Access Control): medium-dependent — handles the specific rules for accessing the shared physical medium, which vary by technology (e.g. CSMA/CD for Ethernet, CSMA/CA for Wi-Fi). It also handles physical/MAC addressing.

Since the MAC sublayer's functions specifically depend on the type of medium in use, it is the correct answer.

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