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CIS 111_Study for Quiz/Test > Chapter 8: Communications and Networks > Flashcards

Chapter 8: Communications and Networks Flashcards

1
Q

Computer communications are

A

The process of sharing data, programs, and information between two or more computers

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2
Q

Numerous applications depend on

A

Communication systems, including:
1. Email
2. Texting
3. Videoconferencing
4. Electronic commerce

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3
Q

Connectivity uses a computer network to

A

Link people and resources

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4
Q

Connects your personal computer to

A

Other computers and resources on a network and the Internet

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5
Q

The Wireless Revolution:

A

1) Single most dramatic change in connectivity in the past decade
2) Allows individuals to connect to the Internet and share information from almost anywhere in the world

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6
Q

Electronic systems that

A

Transmit data from one location to another

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7
Q

Four basic elements of communication systems

A

1) Sending and receiving devices
2) Connection devices
3) Data transmission specifications
4) Communication channel

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8
Q

Sending and receiving devices

A

Computer or a specialized communication device

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9
Q

Connection devices

A

The interface between sending and receiving device

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10
Q

Data transmission specifications

A

Rules and procedures that coordinate the devices

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11
Q

Communication channel

A

Carries the message

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12
Q

Communication channels carry the data from

A

One computer to another, essential element of every communication system

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13
Q

Two categories of communication channels

A

1) Physical connections using wire or cable
2) Wireless connections

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14
Q

The physical connection between sending and receiving device include:

A

1) Twisted pair cable: two pairs of copper wire twisted together
2) Coaxial cable: single solid copper core
3) Fiber-optic cable: tiny glass tubes

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15
Q

Twisted pair cable: two pairs of copper wire twisted together

A
  1. Telephone lines
  2. Ethernet cables
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16
Q

Coaxial cable:

A

Sinble solid copper core and cable TV

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17
Q

Fiber-optic cable:

A

Tiny glass tubes
1. Faster and more reliable than coax
2. Speed as high as 1 petabit per second

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18
Q

Wireless connections do not use

A

A solid substance to connect, use the air itself, and most use radio wave to communicate

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19
Q

Primary Wireless Technology

A

1) Bluetooth (short-range)
2) Wifi (wireless fidelity)
3) Microwave
4) WiMax (extends Wifi)
5) Cellular
6) Satellite
7) Infrared
8) GPS

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20
Q

1) Bluetooth (short-range)

A

Radio communication standard

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21
Q

2) Wifi (wireless fidelity)

A

Uses high frequency radio

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22
Q

3) Microwave

A

Uses high-frequency radio wave signals

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23
Q

4) WiMax (extends Wi-fi)

A

The new standard that uses microwave to extend Wifi range

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24
Q

Cellular

A

Use multiple antennae to communication

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25
Q

Satellite

A

Uses satellites as microwave relay stations

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26
Q

Infrared

A

Use infrared light wants to communication over short distance

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27
Q

GPS

A

Determine geographic location of the devices

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28
Q

Types of signals

A

1) Analog (telephone)
2) Digital (computer)

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29
Q

Transfer rates

A

1) Mbps: million bits per second
2) Gbps: billion bits per second
3) Tbps: trillion bits per second

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30
Q

Modem

A

Modulator or demodulator

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31
Q

Modulation is

A

The process of converting from digital to analog

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32
Q

Demodulation is

A

The process of converting from analog to digital

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33
Q

Transfer rate (continued)

A

Speed in which modems transfer data, and usually measured in megabits per second (Mbps)

34
Q

Types of modems

A

1) Digital subscriber line (DSL)
2) Cable
3) Wireless

35
Q

Digital subscriber line (DSL)

A

High speed telephone lines

36
Q

Cable

A

Uses coaxial cable

37
Q

Wireless

A

Also known as WWAN

38
Q

Leased lines

A

1) T1 combined to form T3 and DS3
2) Have been replaced by OC lines: Faster optical carrier lines
3) Higher capacity: Not affordable for individuals

39
Q

Digital subscriber line (DSL)

A

1) Uses phone lines
2) ADSL is most widely used type of DSL

40
Q

Cable

A

1) Uses an existing TV cable
2) Faster than DSL

41
Q

Fiber Optic Service (FiOS)

A

New technology: Google and Verizon

42
Q

Satellite connection service

A

Use almost anywhere

43
Q

Cellular Services

A

3G and 4G cellular network connectivity

44
Q

The Mobile Office

A

1) Can telecommute from anywhere
2) Become a one-man workforce

45
Q

The data transmission bandwidth is

A

How much information can move across the communication channel in a given amount of time.

46
Q

The data transmission measurement is

A

Of the width or capacity of the communication channel

47
Q

Categories of bandwidth

A

1) Voiceband (or low bandwidth)
2) Medium band-leased lines for high-speed
3) Broadband for DSL, cable, and satellite connection to the Internet
4) Baseband for individual connections for computers in close range

48
Q

Protocol

A

Communication rules for exchange data between computers

49
Q

HTTPS

A

Hypertext Transfer Protocol Secure: 1) Widely used to protect the transfer of sensitive data

50
Q

TCP/IP

A

Transmission control protocol/Internet protocol
1) Most widely used protocol
2) Each computer is identified with unique IP (Internet Protocol) address
3) DNS: Domain name service resolves IP addresses to names
4) Packetization: Information is broken down into small parts (packets) and then reassembled

51
Q

Network

A

A communication system that connects two or more computers so they can exchange information and share resources

52
Q

Nodes

A

Any device connected to a network

53
Q

Client

A

A node that requests and uses resource from other nodes

54
Q

Server

A

A node that share resources with other nodes

55
Q

Directory Server

A

Specialized server that managers resource

56
Q

Host

A

Computer system that can be accessed over a network

57
Q

Router

A

Node that forwards or routes data packets

58
Q

Switch

A

Central node that coordinates the flow of data

59
Q

Network Interface Cards (NIC)

A

Expansion card that connects a computer to a network

60
Q

Network Operating System

A

Control activities of all computers on the network

61
Q

Network Administrator

A

Computer specialists responsible for network operations

62
Q

LAN

A

Local area network, located within close proximity

63
Q

Home

A

Local area network for home use, typically wireless

64
Q

WLAN

A

Wireless local area network, all communication passes through an access point

65
Q

PAN

A

Personal area network, connects digital devices, such as PDAs

66
Q

MAN

A

Metropolitan are network, typically spans cities with coverage up to 100 miles

67
Q

WAN

A

Wide are network for countrywide or worldwide coverage

68
Q

How the network is

A

Arranged and resources are shared

69
Q

Network Topology

A

Physical arrangement of the network

70
Q

Network Strategy

A

How the information and resources are shared

71
Q

Network Strategies

A

1) Client/Server Network
2) Peer-to-Peer (P2P) Network

72
Q

Client/Server Network

A

1) Central computers coordinate and supply services to other nodes on the network
2) Server provides access

73
Q

Peer-to-Peer (P2P) Network

A

1) All nodes have equal authority
2) Can act as both client and server

74
Q

Internet technologies support effective communication within and between organizations.

A

1) Intranet
2) Extranet

75
Q

Intranet

A

1) Private network within an organization
2) Works like the Internet

76
Q

Extranet

A

1) Private network that connects more than one organization
2) Works like the Internet, but provides suppliers and other trusted partners with limited access to the organization’s networks

77
Q

Commonly used technologies to ensure network security

A

1) Firewall
2) Intrusion detection system (IDS)
3) Virtual private network (VPN)

78
Q

Firewall

A

1) Hardware and software that controls access to the network
2) Proxy server provides pass-through access
3) Protects against external threats

79
Q

An intrusion detection system (IDS)

A

1) Works with the firewall to protect the organization’s network
2) Analyze all incoming and outgoing network traffic

80
Q

Virtual private network (VPN)

A

Creates a secure private network connection between your computer and the organization

81
Q

Telepresence

A

1) Seeks to create the illusion that you are actually at a remote location
2) Early implementations mainly focus on an extension of video conferencing

CIS 111_Study for Quiz/Test (9 decks)

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