Welcome to ICTJ 252 Data Communication and Computer Networking-2026.
You have 30 questions to answer (10 questions per page),
1 mark for each correct answer.
The pass mark is 10.
You have 35 minutes for this Quiz.
Please, do not cheat.
A telephone line normally has a bandwidth of 3000 Hz (300 to 3300 Hz) assigned for data communications. The signal-to-noise ratio is usually 3162.
Signals with a frequency below 2 MHz use…………….propagation.
Which factor makes fiber optic cable superior to twisted-pair cable?
We need to send 240 kbps over a noiseless channel with a bandwidth of 20 kHz. How many signal levels do we need?
Data flow between two devices can occur in a………way
The transmission impairment that refers to a signal with high energy in a very short time is known as………..
A…………..is a set of rules that governs data communication.
When you hear a different voice during a voice call it termed as what kind of noise.
In fiber optics, the signal is……….waves.
In the…………transmission mode, communication is unidirectional.
The term that refers to the loss of strength of a signal is called.
The inner core of an optical fiber is………..in composition.
One of these refers to the direction of signal flow between two linked devices.
Which factor makes twisted-pair cable widely used than fiber optic cable?
A line-of-sight transmission impairment that can be water and oxygen is called.
Signals with a frequency above 30 MHz use…………….propagation.
In the transmission mode, each station can transmit, but not at the same time.
A transmission media can have signal impairment because of…..
A received signal is often not exactly the same as the original signal due to………..
FM radio is an example of what type of wireless propagation.
In………..transmission, the channel capacity is shared by both communicating devices at all times.
AM radio is an example of what type of wireless propagation.
Which of the following is usually not classified as a guided medium?
The fall in signal strength with distance over any transmission medium is referred to us….
A television broadcast is an example of………….transmission
Consider a noiseless channel with a bandwidth of 4000 Hz transmitting a signal with four signal levels. Calculate the channel capacity.
Digital data refers to the information that is……….......
Consider a noiseless channel with a bandwidth of 3000 Hz transmitting a signal with two signal levels.
A model for communication systems consists of the following components (the list must be in the correct order):
Signal-to-Noise Ratio (SNR) is expressed as…………
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