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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
Satellite
Uses satellites as microwave relay stations
26
Infrared
Use infrared light wants to communication over short distance
27
GPS
Determine geographic location of the devices
28
Types of signals
1) Analog (telephone) 2) Digital (computer)
29
Transfer rates
1) Mbps: million bits per second 2) Gbps: billion bits per second 3) Tbps: trillion bits per second
30
Modem
Modulator or demodulator
31
Modulation is
The process of converting from digital to analog
32
Demodulation is
The process of converting from analog to digital
33
Transfer rate (continued)
Speed in which modems transfer data, and usually measured in megabits per second (Mbps)
34
Types of modems
1) Digital subscriber line (DSL) 2) Cable 3) Wireless
35
Digital subscriber line (DSL)
High speed telephone lines
36
Cable
Uses coaxial cable
37
Wireless
Also known as WWAN
38
Leased lines
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
Digital subscriber line (DSL)
1) Uses phone lines 2) ADSL is most widely used type of DSL
40
Cable
1) Uses an existing TV cable 2) Faster than DSL
41
Fiber Optic Service (FiOS)
New technology: Google and Verizon
42
Satellite connection service
Use almost anywhere
43
Cellular Services
3G and 4G cellular network connectivity
44
The Mobile Office
1) Can telecommute from anywhere 2) Become a one-man workforce
45
The data transmission bandwidth is
How much information can move across the communication channel in a given amount of time.
46
The data transmission measurement is
Of the width or capacity of the communication channel
47
Categories of bandwidth
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
Protocol
Communication rules for exchange data between computers
49
HTTPS
Hypertext Transfer Protocol Secure: 1) Widely used to protect the transfer of sensitive data
50
TCP/IP
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
Network
A communication system that connects two or more computers so they can exchange information and share resources
52
Nodes
Any device connected to a network
53
Client
A node that requests and uses resource from other nodes
54
Server
A node that share resources with other nodes
55
Directory Server
Specialized server that managers resource
56
Host
Computer system that can be accessed over a network
57
Router
Node that forwards or routes data packets
58
Switch
Central node that coordinates the flow of data
59
Network Interface Cards (NIC)
Expansion card that connects a computer to a network
60
Network Operating System
Control activities of all computers on the network
61
Network Administrator
Computer specialists responsible for network operations
62
LAN
Local area network, located within close proximity
63
Home
Local area network for home use, typically wireless
64
WLAN
Wireless local area network, all communication passes through an access point
65
PAN
Personal area network, connects digital devices, such as PDAs
66
MAN
Metropolitan are network, typically spans cities with coverage up to 100 miles
67
WAN
Wide are network for countrywide or worldwide coverage
68
How the network is
Arranged and resources are shared
69
Network Topology
Physical arrangement of the network
70
Network Strategy
How the information and resources are shared
71
Network Strategies
1) Client/Server Network 2) Peer-to-Peer (P2P) Network
72
Client/Server Network
1) Central computers coordinate and supply services to other nodes on the network 2) Server provides access
73
Peer-to-Peer (P2P) Network
1) All nodes have equal authority 2) Can act as both client and server
74
Internet technologies support effective communication within and between organizations.
1) Intranet 2) Extranet
75
Intranet
1) Private network within an organization 2) Works like the Internet
76
Extranet
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
Commonly used technologies to ensure network security
1) Firewall 2) Intrusion detection system (IDS) 3) Virtual private network (VPN)
78
Firewall
1) Hardware and software that controls access to the network 2) Proxy server provides pass-through access 3) Protects against external threats
79
An intrusion detection system (IDS)
1) Works with the firewall to protect the organization's network 2) Analyze all incoming and outgoing network traffic
80
Virtual private network (VPN)
Creates a secure private network connection between your computer and the organization
81
Telepresence
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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