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Group 5 - Coggle Diagram
Group 5
- The data link layer is responsible for multiplexing data streams, data frame detection, medium access, and error control. It ensures reliable point-to-point and point-to-multipoint connections in a communication network.
- It makes sure the appropriate physical protocol is assigned to the data. The data link layer is the second layer in the OSI Model. The three main functions of the data link layer are:
- To deal with transmission errors
- Regulate the flow of data
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- Provide a well-defined interface to the network layer.
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Data Link Frame
Functions
- prepares network data for the
physical network.
Characteristics
- Enables data movement over a link from one
device to another.
- Ensure error-free communication between two
devices by correct transmission of frames.
- Error notification on physical layer.
- Formatting the frame that is used to
encapsulate data.
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Media Access Control Methods
Carrier sense multiple access with collision avoidance (CSMA/CA) Carrier sense multiple access with collision detection (CSMA/CD) Demand priority. Token passing.
LAN topologies:
There are three common topologies found in LANs: star, ring, and bus. In a star topology, all devices on the LAN are interconnected through some central device
Characteristic of LAN:
It is a private network, so an outside regulatory body never controls it. LAN operates at a relatively higher speed compared to other WAN systems.
Characteristic of WAN:
WANs have a large capacity, connecting a large number of computers over a large area, and are inherently scalable. They facilitate the sharing of regional resources. They provide uplinks for connecting LANs and MANs to the Internet.