networks exam 1 study
____________________ is the electronic distortion that a signal passing through a metal wire experiences when a stray magnetic field passes over it.
Electromagnetic interference
The Internet "talks" only ____, so users must use software that supports this protocol. a) IPX/SPX b) DSL c) TCP/IP d) FTP
c) TCP/IP
The personal area network was created in the late ____. a) 1970s b) 1980s c) 1990s d) 2000s
c) 1990s
____ is the design, installation, and support of a network and its hardware and software.a) Convergence b) Voice network c) Data network d) Network management
d) Network management
The ____ in a network architecture define a model for the functions or services that need to be performed. a) servers b) workstations c) routers d) layers
d) layers
The devices that usually connect two or more LANs are the switch, hub, and ____. a) workstation b) access point c) server d) router
d) router
The ____ of a signal is the number of times a signal makes a complete cycle within a given time frame.
frequency
A(n) ____________________ is a device that generates a new signal by creating an exact replica of the original signal.
repeater
The ____ layer of the OSI model performs end-to-end error control and end-to-end flow control.
transport
The TCP/IP ____ layer commonly uses the Transmission Control Protocol (TCP) to maintain an error-free end-to-end connection.
transport
In a(n) ____ none of the wires is wrapped with a metal foil or braid.
unshielded twisted pair (UTP)
____ are represented as continuous waveforms that can be at an infinite number of points between some given minimum and maximum.
Analog signals
____ technology typically transmits analog signals and is capable of supporting multiple channels of data simultaneously.
Broadband coaxial
____ are discrete waveforms, rather than continuous waveforms.
Digital signals
____ cable is a thin glass cable, a little thicker than a human hair, surrounded by a plastic coating.
Fiber-optic
The International Organization for Standardization (ISO) created the ____ reference model in an attempt to standardize the design of communication systems and the interoperability between their components.
Open Systems Interconnection (OSI)
The ____ was not created by a standards-making organization but by a group of computer scientists.
TCP/IP protocol suite
____ is a broadband wireless transmission technology that is based upon a series of IEEE standards.
WiMAX
The data rate is measured in ____.
bits per second (bps)
The transmission time from when a signal first leaves a satellite and then arrives at a ground station is called ____.
propagation delay
The Manchester encoding schemes are called ____, because the occurrence of a regular transition is similar to seconds ticking on a clock.
self-clocking
The period of a signal can be calculated by taking the reciprocal of the frequency (1/frequency).
True
The session layer of the OSI model is responsible for establishing synchronization points.
True
The term "Base", such as in 100BaseT, is an abbreviation for baseband signals using a Manchester encoding.
True
With the CSMA/CD protocol, only one workstation at a time can transmit.
True
ZigBee is a form of wireless technology used within buildings.
True
As the length of a glass cable grows, the light signal attenuates due to reflection and ____.
refraction
Category 5e twisted pair can run farther than 100 meters from its source to its final destination, as long as the signal is regenerated at least every ____ meters.
100
____________________ cable, in its simplest form, is a single wire (usually copper) wrapped in a foam insulation, surrounded by a braided metal shield, then covered in a plastic jacket.
Coaxial
The ____ layer of the OSI model performs end-to-end connection control.
transport
____________________ wire comes as two or more pairs of single-conductor copper wires that have been twisted around each other.
Twisted pair
____________________ twisted pair was designed to transmit 100 Mbps of data for distances up to 100 meters.
CAT 5
A local area network cannot interface with other local area networks.
False
A local area network is only as strong as its strongest link.
False
According to a famous communications theorem created by Nyquist, the sampling rate using pulse code modulation must be at least three times the highest frequency of the original analog waveform.
False
IEEE 802.16a is a revision of the 802.16 standard that provides a high-speed connection for slowly moving devices.
False
If the network is experiencing a high amount of traffic, the chances for collision are small.
False
In a shared segment network, each workstation then has a private or dedicated connection.
False
Metropolitan area networks can transfer data at fast, LAN speeds but over smaller geographic regions than typically associated with a local area network.
False
SNMP is used to allow users to send and receive electronic mail.
False
The OSI model tells us what kind of wire or what kind of connector to use to connect the pieces of a network.
False
The application layer of the OSI model is responsible for token management.
False
The logical link control sublayer defines the layout or format of the data frame, simply called the frame.
False
The network layer of the OSI model is an end-to-end layer.
False
The terms "data" and "signal" mean the same thing.
False
With NRZI, the receiver has to check the voltage level for each bit to determine whether the bit is a 0 or a 1.
False
ZigBee is capable of transmitting signals for up to one mile.
False
The hub, in most applications, has been replaced with the switch.
True
____________________ transmission is a special form of radio transmission that uses a focused ray of light in the infrared frequency range (1012 -1014 MHz).
Infrared
The lowest layer of the TCP/IP protocol suite is the network access or physical layer.
True
A byte consists of 8 bits.
True
A fairly common application for baseband coaxial used to be the interconnection of hubs within a local area network.
True
A hub is a simple device that requires virtually no overhead to operate.
True
A sine wave is common example used to demonstrate an analog signal.
True
All bus networks share a major disadvantage: In general, it is difficult to add a new workstation if no tap currently exists.
True
An inherent problem with the NRZ-L and NRZI digital encoding schemes is that long sequences of 0s in the data produce a signal that never changes.
True
Attenuation in a medium such as copper wire is a logarithmic loss and is a function of distance and the resistance within the wire.
True
Attenuation in a medium such as copper wire is a logarithmic loss and is a function of distance and the resistance within the wire.
True
By convention, the minimum and maximum values of analog data and signals are presented as voltages.
True
By keeping all of the application on the server, the network can control access to the software and can reduce the amount of disk storage required on each user's workstation for this application.
True
Data transmission speed is the number of bits per second that can be transmitted.
True
In a network architecture, as the packet moves up through the layers, the data packet shrinks in size.
True
Light traveling through air experiences little resistance.
True
Like signals, data can be analog or digital.
True
Most modern local area networks provide the capabilities of transferring video images and video streams.
True
Most switches are transparent, which means they learn by themselves.
True
Network architectures are cohesive layers of protocols defining a set of communication services.
True
One of the biggest advantages of local area networks is their ability to share resources in an economical and efficient manner.
True
One of the most explosive areas of growth in recent years has been cell phone networks.
True
One of the primary shortcomings of analog data and analog signals is how difficult it is to separate noise from the original waveform.
True
The Internet is not a single network but a collection of thousands of networks.
True
The NRZ-L encoding scheme is simple to generate and inexpensive to implement in hardware.
True
The TCP/IP protocol suite does not have rigidly defined layers as the OSI model does.
True
The ability to separate noise from a digital waveform is one of the great strengths of digital systems.
True
The big disadvantage of the Manchester schemes is that roughly half the time there will be two transitions during each bit.
True
The bus/tree topology was the first physical design used when local area networks became commercially available in the late 1970s.
True
The data link layer of the OSI model can incorporate some form of error detection software.
True
The TCP/IP ____ layer supports network applications and may include presentation services.
application
When traveling through any type of medium, a signal always experiences some loss of its power due to friction. This loss of power, or loss of signal strength, is called ____.
attenuation
Connecting two wide area networks requires devices such as high-speed ____. a) hubs b) routers c) bridges d) reflectors
b) routers
A ____ is an interconnection of computers and computing equipment using either wires or radio waves over small or large geographic areas. a) personal area network (PAN) b) computer network c) wireless network d) local area network (LAN)
b) computer network
The number of times a signal changes value per second is called the ____ rate.
baud
____ are the computers that store network software and shared or private user files. a) Switches b) Routers c) Servers d) Hubs
c) Servers
____ systems are good at sending low-speed signals over short to medium distances.
ZigBee
____ is the transmission of multiple signals on one medium. a) Multiplexing b) Codec c) Modem d) Package
a) Multiplexing
____ are more advanced devices that are replacing hubs and are capable of filtering out unnecessary traffic. a) Switches b) Routers c) Servers d) Workstations
a) Switches
A ____ is a high-speed network that interconnects multiple sites within a close geographic region, such as a large urban area. a) metropolitan area network (MAN) b) wide area network (WAN) c) local area network (LAN) d) personal area network (PAN)
a) metropolitan area network
The ____________________ of a signal is the height of the wave above (or below) a given reference point.
amplitude
The most common example of ____ data is the human voice.
analog
Cycles per second, or frequency, is represented by ____.
hertz
A(n) ____ connection is a nonphysical connection between sender and receiver that allows an exchange of commands and responses.
logical
A device that modulates digital data onto an analog signal and then demodulates the analog signal back to digital data is a ____.
modem
The TCP/IP ____ layer, sometimes called the Internet layer, is roughly equivalent to OSI's network layer.
network
The ____ layer is the OSI layer that handles routing.
network
____________________ is unwanted electrical or electromagnetic energy that degrades the quality of signals and data.
noise
The three basic components of analog and digital signals are: amplitude, frequency, and ____.
phase
The bottom layer in the OSI model—the ____ layer—handles the transmission of bits over a communications channel.
physical
The ____ layer of the OSI model performs a series of miscellaneous functions necessary for presenting the data package properly to the sender or receiver.
presentation
If you want to transfer data from one point to another, either via a physical wire or through radio waves, the data has to be converted into a(n) ____.
signal
The ____ layer of the OSI model makes sure the data received at the very end of a transmission is exactly the same as the data originally transmitted.
transport
