CIS 3347 Chapter 3 True/False questions
The medium is the physical matter or substance that carries the voice or data transmission.
True
The physical layer is a layer where two communicating nodes are directly connected.
True
The predominant method of transferring information internally in a computer is via parallel mode.
True
Time division multiplexing is more efficient that frequency division multiplexing because the guardbands used in the frequency division multiplexing or not needed.
True
Baud rate is the number of bits transmitted per second.
False
Coaxial cable costs less and offers less shielding to electrical interference than twisted pair cable.
False
Digital transmission occurs when the signal sent over the transmission media constantly varies among an infinite number of states.
False
Digital transmission produces more errors than analog transmission.
False
Fiber optic cable can only be used on LANs.
False
Fiber optic cable carries signals in traditional electrical form
False
Frequency division multiplexing divides the circuit into a set of different time slots.
False
Frequency modulation refers to the changing of the height of the sound wave.
False
Guided media refers to the type of media in which the message is broadcast through the air.
False
In a multipoint circuit configuration, each computer can use the circuit at the same time.
False
In a multipoint circuit configuration, each computer has a dedicated circuit between itself and each of the other computers in the network
False
In simplex transmission, the data flows in both directions at the same time
False
Infrared transmission uses high-frequency light waves to carry data through the air on a direct line-of-sight path between two points.
False
Multimode fiber is capable of longer transmission distances than single mode fiber.
False
Multiplexing increases the cost of provisioning network circuits.
False
Newer telephone circuits, built during the last decade, offer higher quality because they were built using analog transmission.
False
Nonreturn to zero is a type of unipolar signaling
False
Propagation delay is negligible with satellite transmission.
False
Radio, infrared, microwave and satellite are all examples of guided media.
False
Serial mode transmission is much faster than parallel mode transmission.
False
The amount of time it takes to switch between sending and receiving in half-duplex transmission is called the propagation delay.
False
Wavelength division multiplexing can only used with copper cables.
False
With modem communications, the receiving modem converts the incoming digital signal from the telephone line into an analog signal that can be understood by the computer.
False
With nonreturn to zero signaling, the voltage alternates between zero and a positive or negative voltage.
False
A walkie-talkie is an example of half-duplex transmission.
True
Amplitude, frequency and phase are all characteristics of a sound wave.
True
Bandwidth is the difference between the highest and lowest frequencies in a band.
True
Coding schemes are groups of bits that translate into the "alphabet" of any given system.
True
Computers produce digital data whose values are binary: 0 or 1.
True
Data compression can increase the throughput of a communication link.
True
Ethernet, a common LAN technology, uses Manchester encoding.
True
Frequency is the number of cycles per second and is expressed in Hertz.
True
In full-duplex transmission, two stations can send and receive simultaneously.
True
The "local loop" refers to the wires that run from the customer premises to the telephone switch of the telephone company.
True
A codec converts an incoming digital signal to an analog signal for transmission over an analog network.
False
A physical circuit refers to the transmission characteristics of the connection.
False
ASCII is the least popular code for data communications.
False
Manchester encoding is a special type of bipolar signaling in which the signal is changed from high to low or from low to high in the middle of the signal.
True
Microwave transmissions require a line of sight between any two points.
True
Of all the media available, fiber optic provides the highest transmission speeds
True
One form of interference with satellite transmission is called raindrop attenuation in which the transmissions are absorbed by heavy rain.
True
One way to reduce quantizing errors is to increase the sampling rate of the analog signal.
True
Radio data transmission requires that each device has a radio receiver/transmitter and uses a specific frequency.
True
Statistical time division multiplexing does not require the capacity of the circuit to be equal to the sum of the combined circuits.
True
