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csis > module 6 > Flashcards

module 6 Flashcards

1
Q

data communication system

A

eletronic transfer of data from one location to another

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2
Q

major components of data communication system

A

sender and receiver devices
modems or routers
a communication channel

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3
Q

bandwidth

A

the amountof data that can be transferred from one point to another in 1 second

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4
Q

attenuation

A

loss of power in a signal as it travels from the sending device to the receving device

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5
Q

communication media

A

connect the sender and receiver devices - can be conducted or radiated

conducted media: provides a physical path (cable) that signals are transmitted on
radiated media: use an antenna for transmitting data through air or water

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6
Q

data transmission are divided in two types

A

broadband: multiple pieces of data sent simultaneously
narrowband: voice grade transmission that can transfer limited information in a specific period of time

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7
Q

sender and recevier devices

A

input/output device
smart terminal
personal computer
netbook computer
supercomputer
smartphone

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8
Q

modem

A

device that connects the user to the internet

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9
Q

three types of processing configurations

A

centralized
decentralized
distributed

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10
Q

centralized processing

A

all processing is done at one central computer

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11
Q

decentralized

A

each user, department, or division has its computer
more responsive that a centralized processing system
high costs due to # of systems and duplication of efforts

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12
Q

distributed processing

A

solves the problems that centralized and decentralized processing faced
processing is distributed

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13
Q

Open Systems Interconnection model (OSI)

A

seven layer architecture
defines how data is transmitted from computer to computer
each layer performs a specific task

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14
Q

seven layers an osi model

A

application
presentation
session
transport
network
data link
physical

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15
Q

three major types of networks

A

local area networks (LAN)
wide area networks (WAN)
metropolitan area networks (MAN)

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16
Q

LAN

A

connects workstations and peripheral devices in close proximity
used to integrate services within a limited geographical area

17
Q

WAN

A

can span several cities, states or countries
speed determiend by interconnections

18
Q

MAN

A

designed to handle data commincation for multiple orgs in a city

19
Q

five common topologies

A

star
ring
bus
hierarchal
mesh

20
Q

star

A

consists of central computer and nodes
host computer supplies the main processing power

21
Q

ring

A

no host computer required
each computer manages its own connectivity
arranged in a circle

22
Q

bus

A

connects nodes along a network segment
ends of the cable are not connected

23
Q

hierarchical

A

combines computers with different processing strengths
failure of nodes at the bottom level may not have a negative impact on network performance
middle and top nodes are crucial for network operations

24
Q

mesh

A

every node is connected to every other node
highly reliable
costly and difficult to maintain

25
Q

protocols

A

agreed upon methods and rules to exchange info
applied to hardware connections, data transmission and file transfers
specify the format of message packets

26
Q

routing

A

determining the route that data packet is transferred
uses a routing table to determine the best route for the packet

27
Q

centralized routing

A

where one node is in charge of selecting the path for all packets

28
Q

distributed routing.

A

relies of each node to calculate the best possible route

29
Q

three levels of logic

A

presentation: focuses on how data is returned to the client
application: focuses on software processing requests for users
data management: focuses on data management and storage operations

30
Q

two tier architecture

A

client (tier 1) communicates. directly with the server (tier 2)

31
Q

N-tier architecture

A

works to balance the workload b/w the client and server
removes the application logic from the client and server and places it on a middle-tier server

32
Q

wireless tech

A

wireless LANs (WLAN)
wireless WANs (WWAN)

33
Q

WiMax

A

worldwide interoperability for microwave access
designed for wireless MANs

34
Q

mobile networks

A

three part architecture:
base stations
mobile telephone switching offices
subscribers

35
Q

techniques to improve security

A

include a service set identifier (SSID)
use a wired equivalent privacy (WEP)
use an extensible authntication protocol (EAP)
use wifi protected access (WPA)
use WPA2

36
Q

convergence

A

integration of voice, video and data to that multimedia info can be used fro decision making

37
Q
A

csis (11 decks)

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