Basics of Data Communication
What is data communication?
Exchange of data between two devices through a transmission medium.
What is a network?
A collection of interconnected devices/nodes.
What is the difference between point-to-point and multipoint connections?
Point-to-point connects two devices; multipoint connects multiple devices.
What is the function of the physical layer?
Transmits raw bits over medium.
What is segmentation in OSI?
Dividing data into smaller units at Transport layer
Name the five components of a data communication system.
Message, Sender, Receiver, Medium, Protocol.
What is throughput?
Actual rate of successful data transfer.
What is network topology?
Physical/logical arrangement of nodes and links.
What does the data link layer do?
Framing, error detection, flow control and access control.
What is encapsulation?
Adding headers at each layer
What is a protocol?
A set of rules that governs data communication.
What is delay in networking?
Time taken for data to reach destination.
Which topology uses a central hub?
Star topology.
What is multiplexing?
Combining multiple signals into one.
Which layer ensures data format compatibility?
Presentation layer
What are the three types of data flow?
Simplex, Half-duplex, Full-duplex.
What is a node?
Any device capable of sending or receiving data.
What is the major drawback of bus topology?
Failure of backbone affects entire network.
What is circuit switching?
Dedicated path communication with setup and teardown phases.
Which layer ensures reliable data delivery?
Transport layer
What is a link?
Communication pathway between devices.
What is resource sharing in networks?
Sharing hardware, software, and data.
What is mesh topology formula for links?
n(n−1)/2.
What type of addressing is used in the Data Link layer?
Physical addressing (MAC address)
Give one example protocol of Transport layer.
TCP or UDP