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Questions and Answers
Which of the following is not a service provided by the data-link layer?
In the OSI model, what is the main concern of the Media Access Control (MAC) sublayer?
Ethernet operates at which layers of the OSI model?
What is the role of the Logical Link Control (LLC) sublayer in the Data Link layer?
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Which sublayer is responsible for deciding which device has access to the network at any given time?
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Which service is commonly handled by the Data Link layer but not typically by higher layers?
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Study Notes
Data-Link Layer
- Located between the physical and network layers.
- Provides services including framing, flow control, and error control.
Subdivided Data-Link Layer
- Divided into two sublayers: Logical Link Control (LLC) and Media Access Control (MAC).
- LLC provides an interface between the MAC layer and the Network layer.
- MAC is concerned with who can access the network when multiple computers are trying to access it simultaneously.
- MAC is also concerned with physical addressing (MAC addresses) and access control methods.
Ethernet and the OSI Model
- Ethernet is the dominant LAN technology in the world.
- Operates in two areas of the OSI model: the lower half of the data-link layer (the MAC sublayer) and the physical layer.
- LLC and MAC are included in the data-link layer.
- Physical layer includes the medium.
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Description
Learn about the Data Link Layer in the OSI model, its services and subdivisions, including framing, flow control and error control.
