Brainware University Computer Science Module 1

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Questions and Answers

What is a network?

A set of devices connected by communication links.

Define data communications.

The exchange of data between two devices via a transmission medium.

What are the components of a data communications system?

Message, sender, receiver, transmission medium.

Who is the sender in a data communications system?

The device that sends the data message. Signup and view all the answers

What does the term 'data' refer to in data communications?

Information presented in an agreed upon form by the parties. Signup and view all the answers

What are the four fundamental characteristics of an effective data communications system?

<ol> <li>Delivery - the system must deliver data to the correct destination. 2. Accuracy - the system must deliver the data accurately without alteration. 3. Timeliness - the system must deliver data in a timely manner, especially for real-time audio/video. 4. Jitter - refers to the variation in packet arrival time.</li> </ol> Signup and view all the answers

How are text, numbers, and images represented in data communications?

Text is represented as bit patterns using coding systems like Unicode or ASCII. Numbers are directly converted to binary representation. Images are divided into a matrix of pixels, with each pixel assigned a bit pattern. Signup and view all the answers

What is the role of a protocol in data communications?

A protocol is a set of rules that govern data communications. It represents an agreement between communicating devices on how to transmit data. Signup and view all the answers

What is jitter and why is it important for real-time data like audio/video?

Jitter refers to the variation in packet arrival time or uneven delay in packet delivery. For audio/video, minimizing jitter is crucial to ensure smooth real-time playback without interruptions. Signup and view all the answers

What is the purpose of the transmission medium in data communications?

The transmission medium is the physical path by which a message travels from the sender to the receiver. Examples include twisted-pair wire, coaxial cable, fiber-optic cable, and radio waves. Signup and view all the answers