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What are the four fundamental characteristics of a data communications system?
Data that has been altered in transmission but left uncorrected is considered usable.
False
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?
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Which mode allows communication to be unidirectional?
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Which of the following describes half-duplex communication?
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What is the definition of a network?
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What factors are used to measure network performance?
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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.
