Major criteria that data communication network must meet

COMPUTER NETWORKS AND DATA COMMUNICATION

major criteria that data communication network must meet

The major criteria that a data communication network must meet are: Performance Performance is the defined as the rate of transference of error- free data. Timeliness- The system must deliver data in a timely manner. Data delivered late are . The major criteria that a Data Communication Network must meet are: 1. Data Communication and network have changed the way business and other A network must be able to meet certain criterias, these are mentioned below.

Having a large number of concurrent users can slow response time in a network not designed to coordinate heavy traffic loads.

The design of a given network is based on an assessment of the average number of users that will be communicating at any one time. In peak load periods, however, the actual number of users can exceed the average and thereby decrease performance. How a network responds to loading is measure of its performance. Type of transmission medium: The medium defines the speed at which data can travel through a connection.

  • Introduction To Computer Networks

However, the speed of light imposes an upper bound on the data rate. The types of hardware included in a network affect both the speed and capacity of transmission. A higher-speed computer with greater storage capacity provides better performance. The software used to process data at the sender, receiver, and intermediate nodes also affects network performance.

Moving a message from node to node through a network requires processing to transform the raw data into transmittable signals, to route these signals to the proper destination, to ensure error-free delivery, and to recast the signals into a form the receiver can use. The software that provides these services affects both the speed and the reliability of a network link. Well-designed software can speed the process and make transmission more effective and efficient. All networks fail occasionally.

What is Data Communication and Characteristics of Data Communication?

A network that fails often, however, is of little value to a user. Recovery time of a network after a failure: How long does it take to restore service? MODEM - Converts digitl signal by superimposing it on an analog carrier signal which is trnsmitted over analog telephone line. A process known as Modulation A modem at the receiving end converts the analog signal into digital form a process called Demodulation. Demultiplexing A preocess of seperating the multiplexed signals at the receiving end.

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The signal is not boosted, it will totally be lost along the way and may never reach the destination. Simplex Communication in only one direction e. The listener cannot communicate back through radion receiver 2. Half Duplex - Communication in both direction but one direction at a time e.

Full Duplex - Communication occurs in both directions simultenouesly e.

What is Data Communication and Characteristics of Data Communication?

There are three common networks 1. Local Area Network 3. Physical Toplogy - Refers to the physical layout or arrangement of cmponents on the network e. Bus Topolgy Alternatively referred to as a line topology, a bus topology is a network setup in which each computer and network device are connected to a single cable or backbone.

major criteria that data communication network must meet

The following sections contain both the advantages and disadvantages of using a bus topology with your devices. Advantages of bus topology It works well when you have a small network. Easiest network topology for connecting computers or peripherals in a linear fashion. Requires less cable length than a star topology. Disadvantages of bus topology Difficult to identify the problems if the whole network goes down.

major criteria that data communication network must meet

It can be hard to troubleshoot individual device issues. Not great for large networks. Terminators are required for both ends of the main cable.

major criteria that data communication network must meet

Additional devices slow the network down. If a main cable is damaged, the network fails or splits int 2. Ring Topology A ring network is a network topology in which each node connects to exactly two other nodes, forming a single continuous pathway for signals through each node - a ring. Data travels from node to node, with each node along the way handling every packet.

Advantages of ring Topology Very orderly network where every device has access to the token and the opportunity to transmit Performs better than a bus topology under heavy network load Does not require a central node to manage the connectivity between the computers Due to the point to point line configuration of devices with a device on either side each device is connected to its immediate neighborit is quite easy to install and reconfigure since adding or removing a device requires moving just two connections.

Point to point line configuration makes it easy to identify and isolate faults. Reconfiguration for line faults of bidirectional rings can be very fast, as switching happens at a high level, and thus the traffic does not require individual rerouting.

criteria necessary for an effective and efficient network | Classle

Disadvantages of Ring Topology One malfunctioning workstation can create problems for the entire network. This can be solved by using a dual ring or a switch that closes off the break. Moving, adding and changing the devices can affect the network Communication delay is directly proportional to number of nodes in the network Bandwidth is shared on all links between devices More difficult to configure than a Star: Star Toplogy Star networks are one of the most common computer network topologies.

In its simplest form, a star network consists of one central node, typically a switch or hubwhich acts as a conduct to transmit messages. In star topology, every node computer workstation or any other peripheral is connected to a central node.