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21. Which network topology requires a central controller or hub?
A. Star
B. Mesh
C. Ring
D. Bus
ANSWER:A
SOLUTION:Star topology and tree topology require a central controller or hub.
22. A network comprising of multiple topologies.
A. Star
B. Mesh
C. Tree
D. Bus
ANSWER:C
SOLUTION: Tree topology, also known as star-bus topology, is a network structure that resembles a tree with a central node and branches.
23. The topology with highest reliability is?
A. Bus topology
B. Star topology
C. Ring Topology
D. Mesh Topology
ANSWER:D
SOLUTION: Mesh topology is the network topology with the highest reliability. In a mesh topology, each device has a dedicated link to every other device, and multiple devices can transmit data simultaneously.
24. ____ is the transmission of data between two or more computers over communication links.
A. Communication
B. Networking
C. Data communication
D. Data networking
ANSWER:C
SOLUTION:Data communication is the transmission of data between two or more networked devices. These devices can be personal computers, laptops, or mobile phones.
25. Mobile phone is an example of which type of communication channel?
A. Simplex
B. Half duplex
C. Full duplex
D. None of thee
ANSWER:C
SOLUTION: Mobile phones are an example of a full-duplex communication channel. In full-duplex mode, both devices can transmit and receive data simultaneously.
26. Which of the following cables can transmit data at high speeds?
A. Flat cable
B. Co-axial cable
C. Optic fiber cable
D. Twisted pair cable
ANSWER: C
SOLUTION: Fiber optic cables are the fastest media for data transfer, with speeds of up to 100 gigabits per second (Gbps).
27. A device that connects to a network without the use of cables is said to be_________.
A. Cabled
B. Centralized
C. Open source
D. Wireless
ANSWER:D
SOLUTION: A device that connects to a network without the use of cables is called a wireless device.
28. Which of the following represents the fastest data transmission speed?
A. Bandwidth
B. bps
C. gbps
D. kbps
ANSWER:C
SOLUTION: Gbps stands for gigabits per second,
29. In simplex channel, flow of data is __________.
A. Always in one direction
B. Always in both direction
C. In both direction, but one at a time
D. All of the above
ANSWER: A
SOLUTION: In a Simplex Communication data is sent in only one direction.