Q5. 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
Ans:A,C
Explanation:
The OSI model was designed to facilitate open specification for connecting to systems conforming to OSI model. These systems are designed to be open for communication with almost any other system. OSI model breaks down each functional layer so that overall design complexity could be lessened. OSI model primarily consists of seven layers for the flow of information. This is shown in the figure below.
The Data Link Layer corresponds to layer 2 of OSI reference model. This layer is further divided into two sub-layers:
1. Logical Link Control (LLC) sub-layer, and
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.
A. Logical Link Control
B. Data Link Control
C. Media Access Control
D. Physical Layer Control
Ans:A,C
Explanation:
The OSI model was designed to facilitate open specification for connecting to systems conforming to OSI model. These systems are designed to be open for communication with almost any other system. OSI model breaks down each functional layer so that overall design complexity could be lessened. OSI model primarily consists of seven layers for the flow of information. This is shown in the figure below.
The Data Link Layer corresponds to layer 2 of OSI reference model. This layer is further divided into two sub-layers:
1. Logical Link Control (LLC) sub-layer, and
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.