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Questions and Answers
What are the four fundamental characteristics of a data communications system?
What are the four fundamental characteristics of a data communications system?
- Delivery (correct)
- Timeliness (correct)
- Privacy
- Accuracy (correct)
Data that has been altered in transmission but left uncorrected is considered usable.
Data that has been altered in transmission but left uncorrected is considered usable.
False (B)
What component of a data communication system sends the message?
What component of a data communication system sends the message?
Sender
What is referred to as the physical path by which a message travels from sender to receiver?
What is referred to as the physical path by which a message travels from sender to receiver?
Which mode allows communication to be unidirectional?
Which mode allows communication to be unidirectional?
Which of the following describes half-duplex communication?
Which of the following describes half-duplex communication?
What is the definition of a network?
What is the definition of a network?
What factors are used to measure network performance?
What factors are used to measure network performance?
Study Notes
Data Communications
- Data communications involve exchanging data between two devices using a transmission medium, such as a wire cable.
- A communication system consists of hardware (physical equipment) and software (programs)
- Effective data communications depend on four characteristics:
- Delivery: Data must reach the intended recipient only.
- Accuracy: Data should be delivered without alteration.
- Timeliness: Data must be delivered promptly.
- Jitter: Variation in packet arrival time, which impacts audio and video transmission.
Data Communication System Components
- Message: The information being communicated, including text, numbers, images, audio, and video.
- Sender: The device transmitting the message (e.g., computer, phone, camera).
- Receiver: The device receiving the message (e.g., computer, phone, television).
- Transmission Medium: The physical path for message transmission (e.g., twisted pair wire, coaxial cable, fiber-optic cable, radio waves).
- Protocol: A set of rules governing data communication.
Data Flow Communication Modes
- Simplex: Unidirectional communication, like a one-way street. Only one device can transmit, the other can only receive.
- Half-Duplex: Each device can transmit and receive, but not simultaneously.
- Full-Duplex: Both devices can transmit and receive at the same time.
Networks
- A network is a collection of devices (nodes) connected by communication links.
- Nodes can be computers, printers, or any device capable of sending or receiving data.
- Key factors affecting network performance:
- Performance: Measured by delay and throughput, influenced by network elements.
- Reliability: The network's failure rate.
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Description
This quiz covers the essential concepts of data communications, including the characteristics that ensure effective data exchange and the components of a data communication system. You'll learn about the roles of messages, senders, receivers, and transmission mediums in facilitating communication between devices.
