Data Communication Network

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Final Study

Since time division multiplexing was introduced, it has split into two roughly parallel but separate technologies: synchronous time division multiplexing and ____ time division multiplexing

statistical

involves the creation of mathematical equations to calculate various network values

Analytical modeling

multiplexes multiple data streams onto a single fiber-optic line

Wavelength division multiplexing (WDM)

The ____-switched network is most often found in networks designed to transfer computer data (such as the Internet)

packet

SONET defines a hierarchy of signaling levels, or data transmission rates, called ____

synchronous transport signals (STS)

A ____ is a security procedure that uses public key cryptography to assign to a document a code for which you alone have the key

digital signature

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

session

IEEE created the 100-Mbps Ethernet 802.3u protocol also called ____ Ethernet

Fast

When a node on a wide area network ____ network transmits its data, the data is received by all the other nodes

broadcast

technology is a unique form of multiplexing in that all the subchannels multiplexed together are intended for one user

Discrete multitone

cable represented a major improvement in the ability of transmission media to secure sensitive data

Fiber-optic

shift keying represents 0s and 1s by different changes in the phase of a waveform

Phase

Using ____, when a device transmits a binary 0, a zero voltage is transmitted. When the device transmits a binary 1, either a positive voltage or a negative voltage is transmitted

bipolar-AMI

ensures that the network does not become saturated at any one point

Congestion control

shift keying incorporates four different phase angles, each of which represents 2 bits

Quadrature phase

A ____ is a device that interconnects two segments of local area networks and acts as a filter

switch

is the process of sending data over a signal by varying either its amplitude, frequency, or phase

Digital encoding

An interface standard can consist of four parts, or components, all of which reside at the ____ layer.

physical

division multiplexing is a good technique for transmitting multiple concurrent signals over a fiber-optic line

Wavelength

twisted pair is designed to support data transmission with signals as high as 200 MHz for 100 meters

Category 6

is the process of sending data over a signal by varying either its amplitude, frequency, or phase

Modulation

The ____ of a signal is the number of times a signal makes a complete cycle within a given time frame

period

The ____ layer of the OSI model performs congestion control

network

The wireless LAN term for a collection of multiple Basic Service Sets is ____

Extended Service Set (ESS)

are represented as continuous waveforms that can be at an infinite number of points between some given minimum and maximum.

Analog signals

Real-Time Streaming Protocol (RTSP) is a(n) ____ layer protocol

application

In a payback analysis, the ____ Cost is a one-time cost that occurs in Year 0

Development

A local area network works as a ____ network in that clusters of workstations are connected to a central point (hub or switch) through which workstations can transmit messages to one anothe

bus-based

are capable of filtering out unnecessary traffic

Switches

The third PCS technology is ____ and uses a different form of time division multiple access technology

Global System for Mobile (GSM) Communications

is the technology behind the popular digital subscriber line (DSL) system

Coarse wavelength division multiplexing (CWDM)

network is the only network that offers a dedicated path

circuit-switched

With ____, when a frame relay router experiences congestion, it sends a congestion signal forward to the destination station, which in turn tells the originating station to slow down the transfer of data

forward explicit congestion notification (FECN)

technology is a unique form of multiplexing in that all the subchannels multiplexed together are intended for one user

Discrete multitone

The three basic components of analog and digital signals are: amplitude, frequency, and ____

phase

Fibre Channel can support the interconnection of up to ____ devices only

126

When working with stop-and-wait error control, the amount of time a station waits before retransmitting a packet is called

timeout

When converting analog data to digital signals, the frequency at which the snapshots are taken is called the ____ rate

sampling

was the standard created for fiber-optic systems

100BaseFX

is high-quality encryption software that has become quite popular for creating secure e-mail messages and encrypting other types of data files for average users.

PGP

The most basic error-detection techniques are parity checks, which are used with ____ connections

asynchronous

The addition of control information to a packet as it moves through the layers is called ____

encapsulation

A ____ substitution-based cipher replaces a character or group of characters with a different character or group of character

monoalphabetic

Installing proper shielding on cables prevents

crosstalk

A transparent bridge creates the internal port table by using a form of

backward learning

The TCP/IP ____ layer supports network applications and may include presentation services

application

The ____ suite was not created by a standards-making organization but by a group of computer scientists

TCP/IP protocol

are discrete waveforms, rather than continuous waveforms

Digital signals

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