Deck 3: E-Commerce Infrastructure: the Internet, Web, and Mobile Platform

ملء الشاشة (f)
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سؤال
IPv6 provides for 64-bit IP addresses.
استخدم زر المسافة أو
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لقلب البطاقة.
سؤال
Google Apps is an example of cloud computing.
سؤال
Streaming media reduces the effects of latency.
سؤال
The major hubs in the United States where the Internet backbone intersects with regional and local networks are now commonly referred to as Internet Exchange Points (IXPs).
سؤال
The process of slicing digital messages into parcels, sending them along different communication paths as they become available, and reassembling them at the destination point is called:

A) routing.
B) the Transmission Control Protocol.
C) packet switching.
D) the File Transfer Protocol.
سؤال
Which of the following is not one of the basic technological foundations of the Internet?

A) client/server computing
B) Tracert
C) TCP/IP communications protocol
D) packet-switching hardware
سؤال
One of Internet2's projects is a nationwide 100 gigabit-per-second network.
سؤال
Packet switching requires a dedicated circuit.
سؤال
During which period of time did the Institutionalization phase of Internet development take place?

A) 1950-1960
B) 1961-1974
C) 1975-1995
D) 1995-through the present
سؤال
FTP is a protocol used to transfer files to and from a server.
سؤال
T1 and T3 refer to international telephone standards for digital communication.
سؤال
Which of the following occurred during the Commercialization phase of Internet development?

A) The fundamental building blocks of the Internet were realized in actual hardware and software.
B) Large mainframes on different college campuses were linked.
C) The Domain Name System was introduced.
D) NSF privatized the operation of the Internet's backbone.
سؤال
WLAN-based Internet access derives from the same technological foundations as telephone-based wireless Internet access.
سؤال
Internet access providers typically provide faster download speeds than upload speeds to consumers.
سؤال
RSS is an XML format that allows users to have digital content automatically sent to their computers over the Internet.
سؤال
Transmission Control Protocol is the protocol that provides the Internet addressing scheme.
سؤال
During which phase of the development of the Internet was Ethernet invented?

A) Commercialization phase
B) Institutional phase
C) Innovation phase
D) Consolidation phase
سؤال
HTML is the Internet protocol used to transfer Web pages.
سؤال
XML is used to format the structure and style of a Web page.
سؤال
Tablet computers rely on the Internet cloud for processing and storage.
سؤال
The Internet Layer of TCP/IP is responsible for which of the following?

A) placing packets on and receiving them from the network medium
B) addressing, packaging, and routing messages
C) providing communication with the application by acknowledging and sequencing the packets to and from the application
D) providing a variety of applications with the ability to access the services of the lower layers
سؤال
An IPv4 address is expressed as a:

A) 32-bit number that appears as a series of four separate numbers separated by semicolons.
B) 64-bit number that appears as a series of four separate numbers separated by semicolons.
C) 64-bit number that appears as a series of four separate numbers separated by periods.
D) 32-bit number that appears as a series of four separate numbers separated by periods.
سؤال
________ is a utility program that allows you to check the connection between your client and a TCP/IP network.

A) Ping
B) Telnet
C) Tracert
D) Finger
سؤال
Which of the following is the core communications protocol for the Internet?

A) Telnet
B) FTP
C) TCP/IP
D) SSL
سؤال
Which layer of Internet architecture is composed of the telecommunications networks and protocols?

A) Network Technology Substrate layer
B) Middleware Services layer
C) Transport Services and Representation Standards layer
D) Applications layer
سؤال
________ is a model of computing in which firms and individuals obtain computing power and software applications over the Internet, rather than purchasing and installing it on their own computers.

A) Client/server computing
B) P2P computing
C) Mobile computing
D) Cloud computing
سؤال
Which of the following protocols is used to send mail to a server?

A) SMTP
B) FTP
C) HTTP
D) SSL
سؤال
TCP/IP operates in which layer of Internet architecture?

A) Network Technology Substrate layer
B) Middleware Services layer
C) Transport Services and Representation Standards layer
D) Applications layer
سؤال
The layer of Internet architecture that ties the applications to the communications network and includes such services as security and authentication is called the:

A) Network Technology Substrate layer.
B) Middleware Services layer.
C) Transport Services and Representation Standards layer.
D) Applications layer.
سؤال
The addresses used by browsers to identify the location of content on the Web are called:

A) domain names.
B) uniform resource locators.
C) IP addresses.
D) file paths.
سؤال
The backbone of the Internet is formed by:

A) Internet Exchange Points (IXPs).
B) Network Service Providers (NSPs).
C) Internet Service Providers (ISPs).
D) Metropolitan Area Exchanges (MAEs).
سؤال
A(n) ________ is an audio presentation stored as an audio file and posted to the Web for users to download.

A) podcast
B) RSS subscription
C) weblog
D) widget
سؤال
Which of the following allows users to communicate visually and aurally in real-time, and uses high-resolution monitors to simulate the presence of participants?

A) telepresence
B) videoconferencing
C) VOIP
D) IP telephony
سؤال
________ is one of the original Internet services and is used to transfer files from a server computer to a client computer and vice versa.

A) SMTP
B) FTP
C) HTTP
D) SSL
سؤال
Where does TSL operate within TCP/IP?

A) between the Internet Layer and the Transport Layer
B) between the Transport Layer and the Application Layer
C) between the Network Interface Layer and the Transport Layer
D) between the Internet Layer and the Application Layer
سؤال
Which of the following statements about client/server computing is true?

A) It exploded the available communications capacity.
B) It provided communication rules and regulations.
C) It connects multiple powerful personal computers together in one network with one or more servers dedicated to common functions that they all need.
D) It does not provide sufficient computing capacity to support graphics or color.
سؤال
The Transport Layer of TCP/IP is responsible for which of the following?

A) placing packets on and receiving them from the network medium
B) addressing, packaging, and routing messages
C) providing communication with the application by acknowledging and sequencing the packets to and from the application
D) providing a variety of applications with the ability to access the services of the lower layers
سؤال
An Internet-enabled media player would run in which layer of Internet architecture?

A) Network Technology Substrate layer
B) Middleware Services layer
C) Transport Services and Representation Standards layer
D) Applications layer
سؤال
The natural language convention used to represent IP addresses is called the:

A) uniform resource locator system.
B) Internet protocol addressing schema.
C) domain name system.
D) assigned numbers and names (ANN) system.
سؤال
Which of the following is not an advantage of client/server computing over centralized mainframe computing?

A) It is easy to expand capacity by adding servers and clients.
B) Each client added to the network increases the network's overall capacity and transmission speeds.
C) Client/server networks are less vulnerable, in part because the processing load is balanced over many powerful smaller computers rather than concentrated in a single huge computer.
D) There is less risk that a system will completely malfunction because backup or mirror servers can pick up the slack if one server goes down.
سؤال
The concept behind document formatting had its roots in which of the following?

A) XML
B) SGML
C) HTML
D) GML
سؤال
Which of the following is a Web application that enables Internet users to communicate with each other, although not in real time?

A) online chat
B) online forum
C) IM
D) VoIP
سؤال
Which of the following is not true about the mobile platform?

A) Most smartphones use Intel chips.
B) The number of cell phones worldwide exceeds the number of PCs.
C) About 25% of the world's cell phones are smartphones.
D) Unlike PCs, smartphones do not need fans.
سؤال
Which of the following is currently the most popular Web browser?

A) Internet Explorer
B) Netscape
C) Safari
D) Firefox
سؤال
The "hubs" where the backbone owners connect with one another are called:

A) Internet Exchange Points (IXPs).
B) Network Service Providers (NSPs).
C) Internet Service Providers (ISPs).
D) Metropolitan Access Points (MAPs).
سؤال
Which of the following is not a limitation of the current Internet?

A) HTML, which is not proficient for designing business documents or databases for Web viewing
B) limited bandwidth, which causes congestion and cannot adequately handle video and voice traffic
C) architectural restrictions, which stipulate that numerous requests for the same file must each be answered individually, slowing network performance
D) the difficulty in expanding capacity by adding servers and clients
سؤال
The ________ helps define the overall structure of the Internet.

A) IAB
B) IESG
C) W3C
D) ITU
سؤال
Which of the following is a short-range, low-power, wireless network technology useful for remotely controlling industrial, medical, and home automation devices?

A) Wi-Fi
B) WiMAX
C) UWB
D) ZigBee
سؤال
In the United States, there are two main types of cellular networks, CDMA and:

A) GSM.
B) Bluetooth.
C) wireless.
D) WiMAX.
سؤال
Local area networks that operate within a single organization that leases access to the Web directly from regional and national carriers are called:

A) wide area networks.
B) extranets.
C) campus area networks.
D) private exchanges.
سؤال
Which of the following statements about fiber-optic cable is not true?

A) It consists of twelve or sixteen strands of glass.
B) It is thinner and lighter than coaxial or twisted pair cable.
C) It enables better data security than coaxial cable.
D) There are thousands of miles of installed fiber-optic cable in the United States that are not being used.
سؤال
The major technologies used with wireless local area networks are:

A) Wi-Fi and Bluetooth.
B) Wi-Fi and WiMAX.
C) Bluetooth and 3G.
D) WiMAX and 3G.
سؤال
The first Web browser to make it possible to view documents on the Web with colored background, images, and animations was:

A) Netscape Navigator.
B) Mosaic.
C) Mozilla.
D) Internet Explorer.
سؤال
In the address http://www.company.com/clients.html, which of the following is the top-level domain?

A) )com
B) company.com
C) www
D) http
سؤال
Siri is a type of:

A) intelligent personal assistant.
B) widget.
C) gadget.
D) social network.
سؤال
When talking about the physical elements of the Internet, the term redundancy refers to:

A) transmitting multiple copies of a single packet to safeguard against data loss.
B) the use of tiered high-speed switching computers to connect the backbone to regional and local networks.
C) delays in messages caused by the uneven flow of information through the network.
D) multiple duplicate devices and paths in a network built so that data can be rerouted if a breakdown occurs.
سؤال
Which of the following is a high-speed, medium-range, broadband wireless metropolitan area network?

A) Wi-Fi
B) WiMAX
C) Bluetooth
D) ZigBee
سؤال
Which of the following is the "killer app" of 2012?

A) social networks
B) blogs
C) tablet PCs
D) search engines
سؤال
You could expect to find all of the following services in a Web server software package except:

A) security services.
B) FTP.
C) data capture.
D) an RSS aggregator.
سؤال
The ________ is a consortium of corporations, government agencies, and nonprofit organizations that monitors Internet policies and practices.

A) Internet Engineering Steering Group (IESG)
B) World Wide Web Consortium (W3C)
C) Internet Engineering Task Force (IETF)
D) Internet Society (ISOC)
سؤال
________ is a way of formatting pages with embedded links that connect documents to one another and that also link pages to other objects.
سؤال
Outside of e-mail, using a(n) ________ is the most common online daily activity.
سؤال
Specialized computers that interconnect the thousands of computers that make up the Internet in order to transmit message parcels along available communication paths and on to their destinations are called ________.
سؤال
A TCP/IP network located within a single organization for the purposes of communication and information processing is called a(n) ________.
سؤال
________ software refers to the software that enables a computer to deliver Web pages written in HTML to client computers on a network that request this service by sending an HTTP request.
سؤال
An iPad is an example of a(n) ________ computer.
سؤال
A(n) ________ is a Web application that allows users to easily add and edit content on a Web page.

A) wiki
B) podcast
C) blog
D) RSS feed
سؤال
________ refers to delays in messages caused by the uneven flow of information packets through the network.
سؤال
The totality of blog-related Web sites is referred to as the ________.
سؤال
A small application that you embed in a Web page in order to include content and functionality from a different Web site is called a(n) ________.
سؤال
A set of rules for transferring data is called a(n) ________.
سؤال
________ are central directories that list all domain names currently in use for specific domains.
سؤال
________ is a utility program that allows you to track the path of a message you send from your client to a remote computer on the Internet.
سؤال
The protocol that enables the transmission of voice and other forms of audio communication over the Internet is called:

A) VoIP.
B) IPTP.
C) VTP.
D) IP.
سؤال
Which of the following is a Web 2.0 service or application?

A) wikis
B) e-mail
C) IM
D) online forums
سؤال
Which of the following was the largest source of mobile commerce revenue in 2012?

A) mobile advertising
B) location-based services
C) e-book sales
D) mobile retail purchases
سؤال
A(n) ________ is a personal Web page of chronological entries created by an individual or corporation to communicate with readers.
سؤال
All of the following are true about iPhone apps except:

A) They are distributed through Apple's App Store.
B) They are typically written in the Java programming language.
C) They were estimated to generate over $2 billion in 2012.
D) More than 30 billion have been downloaded.
سؤال
Computing devices attached to the Internet that are capable of making HTTP requests and displaying HTML pages are referred to as ________.
سؤال
TCP/IP is divided into four separate ________, each handling a different aspect of the communication problem.
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ملء الشاشة (f)
exit full mode
Deck 3: E-Commerce Infrastructure: the Internet, Web, and Mobile Platform
1
IPv6 provides for 64-bit IP addresses.
False
2
Google Apps is an example of cloud computing.
True
3
Streaming media reduces the effects of latency.
False
4
The major hubs in the United States where the Internet backbone intersects with regional and local networks are now commonly referred to as Internet Exchange Points (IXPs).
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5
The process of slicing digital messages into parcels, sending them along different communication paths as they become available, and reassembling them at the destination point is called:

A) routing.
B) the Transmission Control Protocol.
C) packet switching.
D) the File Transfer Protocol.
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6
Which of the following is not one of the basic technological foundations of the Internet?

A) client/server computing
B) Tracert
C) TCP/IP communications protocol
D) packet-switching hardware
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7
One of Internet2's projects is a nationwide 100 gigabit-per-second network.
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8
Packet switching requires a dedicated circuit.
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9
During which period of time did the Institutionalization phase of Internet development take place?

A) 1950-1960
B) 1961-1974
C) 1975-1995
D) 1995-through the present
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10
FTP is a protocol used to transfer files to and from a server.
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11
T1 and T3 refer to international telephone standards for digital communication.
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12
Which of the following occurred during the Commercialization phase of Internet development?

A) The fundamental building blocks of the Internet were realized in actual hardware and software.
B) Large mainframes on different college campuses were linked.
C) The Domain Name System was introduced.
D) NSF privatized the operation of the Internet's backbone.
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13
WLAN-based Internet access derives from the same technological foundations as telephone-based wireless Internet access.
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14
Internet access providers typically provide faster download speeds than upload speeds to consumers.
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15
RSS is an XML format that allows users to have digital content automatically sent to their computers over the Internet.
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16
Transmission Control Protocol is the protocol that provides the Internet addressing scheme.
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17
During which phase of the development of the Internet was Ethernet invented?

A) Commercialization phase
B) Institutional phase
C) Innovation phase
D) Consolidation phase
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18
HTML is the Internet protocol used to transfer Web pages.
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19
XML is used to format the structure and style of a Web page.
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20
Tablet computers rely on the Internet cloud for processing and storage.
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21
The Internet Layer of TCP/IP is responsible for which of the following?

A) placing packets on and receiving them from the network medium
B) addressing, packaging, and routing messages
C) providing communication with the application by acknowledging and sequencing the packets to and from the application
D) providing a variety of applications with the ability to access the services of the lower layers
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22
An IPv4 address is expressed as a:

A) 32-bit number that appears as a series of four separate numbers separated by semicolons.
B) 64-bit number that appears as a series of four separate numbers separated by semicolons.
C) 64-bit number that appears as a series of four separate numbers separated by periods.
D) 32-bit number that appears as a series of four separate numbers separated by periods.
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23
________ is a utility program that allows you to check the connection between your client and a TCP/IP network.

A) Ping
B) Telnet
C) Tracert
D) Finger
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24
Which of the following is the core communications protocol for the Internet?

A) Telnet
B) FTP
C) TCP/IP
D) SSL
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25
Which layer of Internet architecture is composed of the telecommunications networks and protocols?

A) Network Technology Substrate layer
B) Middleware Services layer
C) Transport Services and Representation Standards layer
D) Applications layer
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26
________ is a model of computing in which firms and individuals obtain computing power and software applications over the Internet, rather than purchasing and installing it on their own computers.

A) Client/server computing
B) P2P computing
C) Mobile computing
D) Cloud computing
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27
Which of the following protocols is used to send mail to a server?

A) SMTP
B) FTP
C) HTTP
D) SSL
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28
TCP/IP operates in which layer of Internet architecture?

A) Network Technology Substrate layer
B) Middleware Services layer
C) Transport Services and Representation Standards layer
D) Applications layer
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29
The layer of Internet architecture that ties the applications to the communications network and includes such services as security and authentication is called the:

A) Network Technology Substrate layer.
B) Middleware Services layer.
C) Transport Services and Representation Standards layer.
D) Applications layer.
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30
The addresses used by browsers to identify the location of content on the Web are called:

A) domain names.
B) uniform resource locators.
C) IP addresses.
D) file paths.
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31
The backbone of the Internet is formed by:

A) Internet Exchange Points (IXPs).
B) Network Service Providers (NSPs).
C) Internet Service Providers (ISPs).
D) Metropolitan Area Exchanges (MAEs).
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32
A(n) ________ is an audio presentation stored as an audio file and posted to the Web for users to download.

A) podcast
B) RSS subscription
C) weblog
D) widget
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33
Which of the following allows users to communicate visually and aurally in real-time, and uses high-resolution monitors to simulate the presence of participants?

A) telepresence
B) videoconferencing
C) VOIP
D) IP telephony
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34
________ is one of the original Internet services and is used to transfer files from a server computer to a client computer and vice versa.

A) SMTP
B) FTP
C) HTTP
D) SSL
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35
Where does TSL operate within TCP/IP?

A) between the Internet Layer and the Transport Layer
B) between the Transport Layer and the Application Layer
C) between the Network Interface Layer and the Transport Layer
D) between the Internet Layer and the Application Layer
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36
Which of the following statements about client/server computing is true?

A) It exploded the available communications capacity.
B) It provided communication rules and regulations.
C) It connects multiple powerful personal computers together in one network with one or more servers dedicated to common functions that they all need.
D) It does not provide sufficient computing capacity to support graphics or color.
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37
The Transport Layer of TCP/IP is responsible for which of the following?

A) placing packets on and receiving them from the network medium
B) addressing, packaging, and routing messages
C) providing communication with the application by acknowledging and sequencing the packets to and from the application
D) providing a variety of applications with the ability to access the services of the lower layers
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38
An Internet-enabled media player would run in which layer of Internet architecture?

A) Network Technology Substrate layer
B) Middleware Services layer
C) Transport Services and Representation Standards layer
D) Applications layer
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39
The natural language convention used to represent IP addresses is called the:

A) uniform resource locator system.
B) Internet protocol addressing schema.
C) domain name system.
D) assigned numbers and names (ANN) system.
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40
Which of the following is not an advantage of client/server computing over centralized mainframe computing?

A) It is easy to expand capacity by adding servers and clients.
B) Each client added to the network increases the network's overall capacity and transmission speeds.
C) Client/server networks are less vulnerable, in part because the processing load is balanced over many powerful smaller computers rather than concentrated in a single huge computer.
D) There is less risk that a system will completely malfunction because backup or mirror servers can pick up the slack if one server goes down.
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41
The concept behind document formatting had its roots in which of the following?

A) XML
B) SGML
C) HTML
D) GML
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42
Which of the following is a Web application that enables Internet users to communicate with each other, although not in real time?

A) online chat
B) online forum
C) IM
D) VoIP
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43
Which of the following is not true about the mobile platform?

A) Most smartphones use Intel chips.
B) The number of cell phones worldwide exceeds the number of PCs.
C) About 25% of the world's cell phones are smartphones.
D) Unlike PCs, smartphones do not need fans.
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44
Which of the following is currently the most popular Web browser?

A) Internet Explorer
B) Netscape
C) Safari
D) Firefox
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45
The "hubs" where the backbone owners connect with one another are called:

A) Internet Exchange Points (IXPs).
B) Network Service Providers (NSPs).
C) Internet Service Providers (ISPs).
D) Metropolitan Access Points (MAPs).
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46
Which of the following is not a limitation of the current Internet?

A) HTML, which is not proficient for designing business documents or databases for Web viewing
B) limited bandwidth, which causes congestion and cannot adequately handle video and voice traffic
C) architectural restrictions, which stipulate that numerous requests for the same file must each be answered individually, slowing network performance
D) the difficulty in expanding capacity by adding servers and clients
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47
The ________ helps define the overall structure of the Internet.

A) IAB
B) IESG
C) W3C
D) ITU
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48
Which of the following is a short-range, low-power, wireless network technology useful for remotely controlling industrial, medical, and home automation devices?

A) Wi-Fi
B) WiMAX
C) UWB
D) ZigBee
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49
In the United States, there are two main types of cellular networks, CDMA and:

A) GSM.
B) Bluetooth.
C) wireless.
D) WiMAX.
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50
Local area networks that operate within a single organization that leases access to the Web directly from regional and national carriers are called:

A) wide area networks.
B) extranets.
C) campus area networks.
D) private exchanges.
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51
Which of the following statements about fiber-optic cable is not true?

A) It consists of twelve or sixteen strands of glass.
B) It is thinner and lighter than coaxial or twisted pair cable.
C) It enables better data security than coaxial cable.
D) There are thousands of miles of installed fiber-optic cable in the United States that are not being used.
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52
The major technologies used with wireless local area networks are:

A) Wi-Fi and Bluetooth.
B) Wi-Fi and WiMAX.
C) Bluetooth and 3G.
D) WiMAX and 3G.
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53
The first Web browser to make it possible to view documents on the Web with colored background, images, and animations was:

A) Netscape Navigator.
B) Mosaic.
C) Mozilla.
D) Internet Explorer.
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54
In the address http://www.company.com/clients.html, which of the following is the top-level domain?

A) )com
B) company.com
C) www
D) http
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55
Siri is a type of:

A) intelligent personal assistant.
B) widget.
C) gadget.
D) social network.
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56
When talking about the physical elements of the Internet, the term redundancy refers to:

A) transmitting multiple copies of a single packet to safeguard against data loss.
B) the use of tiered high-speed switching computers to connect the backbone to regional and local networks.
C) delays in messages caused by the uneven flow of information through the network.
D) multiple duplicate devices and paths in a network built so that data can be rerouted if a breakdown occurs.
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57
Which of the following is a high-speed, medium-range, broadband wireless metropolitan area network?

A) Wi-Fi
B) WiMAX
C) Bluetooth
D) ZigBee
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58
Which of the following is the "killer app" of 2012?

A) social networks
B) blogs
C) tablet PCs
D) search engines
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59
You could expect to find all of the following services in a Web server software package except:

A) security services.
B) FTP.
C) data capture.
D) an RSS aggregator.
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60
The ________ is a consortium of corporations, government agencies, and nonprofit organizations that monitors Internet policies and practices.

A) Internet Engineering Steering Group (IESG)
B) World Wide Web Consortium (W3C)
C) Internet Engineering Task Force (IETF)
D) Internet Society (ISOC)
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61
________ is a way of formatting pages with embedded links that connect documents to one another and that also link pages to other objects.
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62
Outside of e-mail, using a(n) ________ is the most common online daily activity.
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63
Specialized computers that interconnect the thousands of computers that make up the Internet in order to transmit message parcels along available communication paths and on to their destinations are called ________.
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64
A TCP/IP network located within a single organization for the purposes of communication and information processing is called a(n) ________.
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65
________ software refers to the software that enables a computer to deliver Web pages written in HTML to client computers on a network that request this service by sending an HTTP request.
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66
An iPad is an example of a(n) ________ computer.
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67
A(n) ________ is a Web application that allows users to easily add and edit content on a Web page.

A) wiki
B) podcast
C) blog
D) RSS feed
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68
________ refers to delays in messages caused by the uneven flow of information packets through the network.
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69
The totality of blog-related Web sites is referred to as the ________.
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70
A small application that you embed in a Web page in order to include content and functionality from a different Web site is called a(n) ________.
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71
A set of rules for transferring data is called a(n) ________.
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72
________ are central directories that list all domain names currently in use for specific domains.
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73
________ is a utility program that allows you to track the path of a message you send from your client to a remote computer on the Internet.
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74
The protocol that enables the transmission of voice and other forms of audio communication over the Internet is called:

A) VoIP.
B) IPTP.
C) VTP.
D) IP.
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75
Which of the following is a Web 2.0 service or application?

A) wikis
B) e-mail
C) IM
D) online forums
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76
Which of the following was the largest source of mobile commerce revenue in 2012?

A) mobile advertising
B) location-based services
C) e-book sales
D) mobile retail purchases
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77
A(n) ________ is a personal Web page of chronological entries created by an individual or corporation to communicate with readers.
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78
All of the following are true about iPhone apps except:

A) They are distributed through Apple's App Store.
B) They are typically written in the Java programming language.
C) They were estimated to generate over $2 billion in 2012.
D) More than 30 billion have been downloaded.
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79
Computing devices attached to the Internet that are capable of making HTTP requests and displaying HTML pages are referred to as ________.
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80
TCP/IP is divided into four separate ________, each handling a different aspect of the communication problem.
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