IT Certification Practice Exams

CCNA 640-802 Exam Practice Questions
OSI data link layer sub layers LLC, and MAC

Q3. Two sub layers of OSI Data Link layer are which of the following? [Select 2].

A. Logical Link Control

B. Data Link Control

C. Media Access Control

D. Physical Layer Control

Correct answer: A,C

Explanation:

Data Link Layer is layer 2 of OSI reference model. This layer is divided into two sub-layers:

1.Logical Link Control (LLC) sub-layer.

2. Media Access Control (MAC) sub-layer.

The LLC sub-layer handles error control, flow control, framing, and MAC sub-layer addressing.

The MAC sub-layer is the lower of the two sub-layers of the Data Link layer.

MAC sub-layer handles access to shared media, such a Token passing or Ethernet.

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