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