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Questions and Answers
Which of the following is not a service provided by the data-link layer?
Which of the following is not a service provided by the data-link layer?
- Framing
- Flow Control
- Routing (correct)
- Error Control
In the OSI model, what is the main concern of the Media Access Control (MAC) sublayer?
In the OSI model, what is the main concern of the Media Access Control (MAC) sublayer?
- Access control methods and physical addressing (correct)
- Application management
- End-to-end communication
- Encryption and decryption
Ethernet operates at which layers of the OSI model?
Ethernet operates at which layers of the OSI model?
- Data Link and Physical (correct)
- Network and Transport
- Session and Transport
- Application and Presentation
What is the role of the Logical Link Control (LLC) sublayer in the Data Link layer?
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?
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?
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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