INTRODUCTION TO NETWORKING REVISION EXERCISE
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State three advantages of the ring network.
​Explain how contention for a communication medium is addressed in token ring network topology.26/11/2022 Explain how contention for a communication medium is addressed in token ring network topology. The single token regulates which computer is allowed to transmit and which one waits at a particular instance.
Describe how a message is transmitted from the source to the destination node in a ring network.26/11/2022 Describe how a message is transmitted from the source to the destination node in a ring network.Computers in a ring network communicate to each other by putting messages in a small virtual packet called a token and then sending it to the next computer on the ring in a unidirectional manner.
The content in the packet has the address of the recipient computer. If the token reaches the computer to which data was addressed, that computer picks it, reads the message, then gives an acknowledgement to the sender. It then regenerates the token for circulation to the next computer. If the token was not meant for it, it passes the token on to the next computer in the same direction. Compare and contrast bus and token ring topologies.Each of the topologies has a common medium of communication between all the computers in it.
However, the computers in the bus topology are connected to the bus which is terminated at both ends, while in the ring topology, adjacent computers are joined to each other to form a complete ring. In addition, computers on a bus topology communicate through broadcasting while those on the ring do not broadcast, they communicate through a special packet called a token. State three advantages and three disadvantages of the star network topology.Advantages
Disadvantages
State two disadvantages of bus networks.
State two advantages of bus networks.
Differentiate between Carrier Sense Multiple Access with Collision Detection (CSMA/CD) and the Carrier Sense Multiple Access with Collision Avoidance (CSMA/ CA) protocols as used on bus networks.In CSMA/CD, all computers are connected to a single cable known as the bus. The bus provides connectivity and communication channel bandwidth for all the computers.
All computers listen to activity on the bus. If a computer wants to send a message, it simply places the message on the bus. In case two computers want to send a message at the same time, a collision occurs and they both refrain for arbitrary time spans before trying again. This is known as exponential back off. This protocol is common on wired bus networks, also known as wired ethernet networks. The CSMA/CA protocol, on the other hand, is similar to the CSMA/CD except that the computers intending to send data continuously listen to the channel to find out whether it is engaged or not. If the channel is free, the computer starts transmitting. This is common on wireless LANs and Wi-Fi networks. List three hardware devices that make up a bus network.
Using illustrations, describe each of the following topologies:(a) star(b) ring(c) bus(d) mesh26/11/2022 Using illustrations, describe each of the following topologies:
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