27 Questions
What is the main function of the physical layer in a network?
Connecting network hardware and circuits
What does FDM stand for in the context of circuits?
Frequency Division Multiplexing
In the context of network circuits, what does a T-1 connection refer to?
A physical circuit with a transmission rate of 1.544 Mbps
What is the purpose of modems in analog transmission of digital data?
To convert digital data to analog signals for transmission
What is the approximate size of a multimode optical fiber core?
50 microns
What type of transmission does a single mode optical fiber use?
Transmits a single direct beam through the cable
What type of wireless transmission is subject to interference from heavy rain, smog, and fog?
Infrared waves
What type of radio communication requires line-of-sight and is often used for long distance, terrestrial transmissions?
Microwaves
Which of the following factors is used in media selection?
Error rates in the wireless media
Which code is used to represent letters, numbers, and symbols in a message on PC computers?
ASCII
Which transmission mode sends bit by bit over a single wire?
Serial transmission
What type of signaling defines how the voltage levels correspond to the bit values of 0 or 1?
Unipolar signaling
Which digital transmission type defines a bit value by a mid-bit transition?
Manchester encoding
What type of transmission is used in local loop phone lines to connect PCs to the Internet?
Analog transmission
What technology is used to enable voice communications between two telephones over POTS?
Analog communications
Which characteristic of sound waves refers to the number of waves that pass in a second?
Frequency
What is the main advantage of digital transmission over analog transmission?
Allows higher maximum transmission rates
In a point-to-point configuration, why does each computer have its own circuit to reach the other computer in the network?
Because each computer generates enough data to fill the capacity of the circuit
Which type of data flow moves in both directions at the same time?
Data flows in both directions at the same time
In which data flow method does data flow in one direction only?
Simplex Method
Which type of multiplexing requires guardbands to prevent interference between channels?
Frequency division multiplexing (FDM)
How does time division multiplexing (TDM) divide up the circuit?
Vertically
What is the main advantage of statistical time division multiplexing (STDM) over traditional TDM?
It makes use of the idle time slots
What does Inverse Multiplexing (IMUX) do?
Shares the load by sending data over two or more lines
How does Frequency Division Multiplexing (FDM) create smaller channels from a larger frequency band?
Dividing the circuit horizontally
Which type of configuration is used when many computers are connected on the same circuit?
Multipoint Configuration
What is a key advantage of digital transmission in terms of error detection and correction?
Easier to detect and correct errors due to binary nature (1s and 0s)
Test your knowledge on circuits configuration, data flow, multiplexing, communication media, and digital transmission as outlined in Chapter 3 of the 9th Edition of 'Business Data Communications and Networking' by Jerry Fitzgerald and Alan Dennis.
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