data and information Flashcards
(32 cards)
What is data communication?
The exchange of data between devices through a transmission medium.
True or False: Data communication can occur only over wired connections.
False
Fill in the blank: The two main types of data communication are ______ and ______.
analog, digital
What does the term ‘bandwidth’ refer to?
The maximum rate of data transfer across a network.
What is the purpose of a protocol in data communication?
To establish rules for data exchange between devices.
List one example of a data communication protocol.
TCP/IP
What is the difference between simplex, half-duplex, and full-duplex communication?
Simplex allows one-way communication, half-duplex allows two-way communication but not simultaneously, and full-duplex allows simultaneous two-way communication.
What does ‘latency’ refer to in data communication?
The time delay between the sending and receiving of data.
True or False: Circuit switching is more efficient than packet switching for data communication.
False
What is packet switching?
A method of data transmission where data is broken into packets and sent independently over the network.
What is a ‘ computer network ‘?
it is the number of a number of interconnected computers or devices called nodes.
Name the type of computer network.
LAN, MAN,WAN AND PAN
What is the function of a router in a network?
To forward data packets between different networks.
True or False: The OSI model has seven layers.
True
What are the layers of the OSI model in order?
Physical, Data Link, Network, Transport, Session, Presentation, Application
What does the ‘Transport Layer’ do in the OSI model?
It ensures reliable data transfer and error correction.
Fill in the blank: The ______ layer is responsible for data formatting and encryption in the OSI model.
Presentation
What is ‘data processing’?
The manipulation of data to convert it into meaningful information.
Name one common data processing method.
Batch processing
What is the main difference between batch processing and real-time processing?
Batch processing handles data in groups at scheduled times, while real-time processing handles data instantly as it is received.
What is ‘data integrity’?
The accuracy and consistency of data over its entire lifecycle.
True or False: Data compression reduces the size of data for storage or transmission.
True
What is the purpose of error detection in data communication?
To identify and correct errors in transmitted data.
Fill in the blank: ______ is a method used to ensure data integrity during transmission.
Checksum
