Telecommunications PDF

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A local area network connects two or more communicating devices in a limited geographical area. Network interface cards are special adapters that link an individual device to the communications medium on a local area network. The network interface card typically houses the LAN's network operating system. Wide-area networks have a large capacity, and they typically use a single communications channel. Digital signals are continuous waves that transmit information by altering the characteristics of the waves. Digital signals have two parameters: frequency and amplitude. The U.S. public telephone system was designed as an analog network to carry voice signals. Cable media use wires or cables to transmit data and information. Twisted-pair wire is the least-used form of communications wiring. Cladding is the coating that surrounds fiber-optic cables and prevents light from leaking out of the fiber. Systems that use digital subscriber lines (DSL) do not require modems.

Currently, ATM networks operate only on fiber-optic cable. The Internet is a global network of computer networks. An intranet is a network that uses Internet technologies and is designed to serve the information needs of a single organization.

A local area network connects two or more communicating devices in a limited geographical area. Answer: True Network interface cards are special adapters that link an individual device to the communications medium on a local area network. Answer: True The network interface card typically houses the LAN's network operating system. Answer: False Wide-area networks have a large capacity, and they typically use a single communications channel. Answer: False Digital signals are continuous waves that transmit information by altering the characteristics of the waves. Answer: False Digital signals have two parameters: frequency and amplitude. Answer: False The U.S. public telephone system was designed as an analog network to carry voice signals. Answer: True Cable media use wires or cables to transmit data and information. Answer: True Twisted-pair wire is the least-used form of communications wiring. Answer: False Cladding is the coating that surrounds fiber-optic cables and prevents light from leaking out of the fiber. Answer: True Systems that use digital subscriber lines (DSL) do not require modems. Answer: False Currently, ATM networks operate only on fiber-optic cable. Answer: True The Internet is a global network of computer networks. Answer: True An intranet is a network that uses Internet technologies and is designed to serve the information needs of a single organization. Answer: True Intranets support discovery, communication, and collaboration inside an organization. Answer: True An extranet is a network that uses Internet technologies and is designed to serve the information needs of a single organization. Answer: False Extranets offer limited accessibility to the intranets of participating companies. Answer: True An Internet service provider is a company that offers Internet connections for a fee. Answer: True Internet kiosks are computer terminals located in public places like libraries and airports. Answer: True

A domain name is the official name assigned to an Internet site, consisting of multiple parts, separated by dots, which are translated from right to left in locating the site. Answer: True The rightmost part of an Internet name is the top-level specification, or the zone. Answer: True The World Wide Web is a system with universally accepted standards for storing, retrieving, formatting, and displaying information via a client/server architecture. Answer: True Uniform resource locators (URLs) point to the address of a specific resource or site on the Web. Answer: True Uniform resource locators (URLs) are software applications through which users access the Web. Answer: False The hypertext transport protocol (HTTP) is the communications standard used to transfer pages across the World Wide Web portion of the Internet. Answer: True A major problem of the discovery applications of networks is the huge amount of information available. Answer: True Metasearch engines search several engines at once and integrate the findings of the various search engines. Answer: True The quality of automatic translation of Web pages is usually just as good as human translation. Answer: False Commercial portals are intended for broad audiences and offer fairly routine content. Answer: True Industrywide portals are intended for broad audiences and offer fairly routine content. Answer: False Electronic mail is the largest-volume application running over the Internet. Answer: True With Voice-over-IP, every call opens up a dedicated circuit for the duration of the call. Answer: False E-learning is conducted only in virtual classrooms, where all coursework is completed online. Answer: False Virtual universities are online universities from which students take classes from home or at an off-site location, via the Internet. Answer: True Employees who telecommute have generally found that the experience enhances their careers. Answer: False _____ refers to the range of frequencies available in any communications channel. a) Protocol

b) Broadband c) Capacity d) Narrowband e) Bandwidth e) Bandwidth Which of the following are advantages of computer networks? a) They enable organizations to be more flexible. b) They enable companies to share hardware, computer applications, and data. c) They enable geographically dispersed employees to work together. d) They provide a critical link between businesses and their customers. e) All of these e) All of these The components of a local area network include which of the following? a) File server b) Client computers c) Wireline or wireless communications media d) Network interface cards e) All of these e) All of these Which of the following is not a component of a local area network? a) File server b) Client computers c) Bridge d) Network interface cards e) All of these c) Bridge A _____ connects dissimilar networks. a) Router b) Network interface card c) Bridge d) Gateway e) File server d) Gateway A(n) _____ connects two or more devices in a limited geographical area. a) Local area network b) Wide-area network c) Personal area network d) Enterprise network e) Value added network a) Local area network

A _____ sends messages through several connected LANs or to a wide-area network. a) Router b) Network interface card c) Bridge d) Gateway e) File server a) Router A _____ allows a device to physically connect to a local area network's communications medium. a) File server b) Network interface card c) Network operating system d) Communications channel e) Gateway b) Network interface card All of the following statements concerning wide-area networks are true except: a) They are provided by individual companies. b) They have large capacity. c) They cover large geographical areas. d) They combine multiple communications channels. e) The Internet is an example of a wide-area network. a) They are provided by individual companies. The function of _____ is to convert digital signals to analog signals and vice-versa. a) Modems b) Multiplexers c) Front-end processors d) Servers e) Clients a) Modems _____ signals convey information in wave form, whereas _____ signals convey information in binary form. a) Analog, packet b) Analog, digital c) Digital, packet d) Digital, analog e) Packet, analog b) Analog, digital _____ are hardware devices that support data transmission and reception across a telecommunications system. a) Integrated services digital networks

b) Digital subscriber lines c) Communications channels d) Integrated circuits e) Communications processors c) Communications channels Which of the following is not a communications channel? a) Fiber-optic cable b) Satellite transmission c) Twisted-pair wire d) Integrated circuits e) Cellular radio d) Integrated circuits Which of the following is not a characteristic of twisted-pair wire? a) Inexpensive b) Easy to work with c) Subject to interference from other electrical sources d) Secure transmissions e) None of these d) Secure transmissions The cable medium with the highest bandwidth is: a) Twisted-pair wire b) Coaxial cable c) Fiber-optic cable d) Cellular radio e) Copper cable c) Fiber-optic cable Data are sent through a fiber-optic cable by a(n) _______. a) Optical switch b) Electromagnetic switch c) Laser d) Multiplexer e) Optical modem c) Laser Which data transmission technology requires fiber-optic cable, can transmit up to 2.5 gigabits per second, and is more expensive than DSL? a) Digital subscriber line b) Asynchronous transfer mode c) Synchronous optical network d) T-carrier system e) ISDN b) Asynchronous transfer mode

Which transmission technology is an interface standard for transporting digital signals over fiber-optic lines that enables the integration of transmissions from multiple vendors? a) Digital subscriber line b) Asynchronous transfer mode c) Synchronous optical network d) T-carrier system e) ISDN c) Synchronous optical network Which of the following is a digital transmission system that defines circuits that operate at different rates, all of which are multiples of the basic 64 Kbps used to transport a single voice call? a) Digital subscriber line b) Asynchronous transfer mode c) Synchronous optical network d) T-carrier system e) ISDN d) T-carrier system In order to ensure that computers developed by different manufacturers can communicate, _____ have been developed. a) Protocols b) Client/server architectures c) WANs d) Application software packages e) Developmental architectures a) Protocols A protocol is: a) A device that handles the switching of voice and data in a local area network. b) A standard set of rules and procedures for the control of communications in a network. c) A communications service for the connection of devices in a local area network. d) The main communications channel in a wide-area network. e) Synonymous with network interface card b) A standard set of rules and procedures for the control of communications in a network The part of a network that handles the major traffic is the ________. a) Front end b) Network interface c) Multiplexer d) Backbone e) Front end processor d) Backbone

Which of the following enables users to send data across sometimes unreliable networks? a) Ethernet b) TCP/IP c) Protocols d) Digital subscriber lines e) Integrated services digital network b) TCP/IP In TCP/IP, IP is responsible for: a) Disassembling and reassembling of packets during transmission. b) Establishing the Internet connection between two computers. c) Moving packets over the network. d) Sequencing the transfer of packets across the network. e) Error checking a) Disassembling and reassembling of packets during transmission. Which of the following statements concerning packet switching is not true? a) Packets contain a sequence number. b) Packets are routed through different paths. c) Packets require dedicated circuits. d) Packets use TCP/IP to carry their data. e) Packets contain destination addressing. Answer: c c) Packets require dedicated circuits A type of processing that links two or more computers in an arrangement in which some machines provide computing services for user computers is best described as _______. a) Open systems b) Client/server c) Peer-to-peer d) Centralized e) Mainframe-centric b) Client/server BitTorrent uses a process called _____, which eliminates file-sharing bottlenecks by having everyone share little pieces of a file at the same time. a) Leeching b) Collaboration c) Packet switching d) Torrents e) Swarming e) Swarming

The _____ is a global wide-area network that connects approximately 1 million organizational computer networks. a) Ethernet b) Extranet c) Internet d) Intranet e) World Wide Web c) Internet ) A(n) _____ is a network designed to serve the internal informational needs of a single organization. a) Global network b) Extranet c) Internet d) Intranet e) World Wide Web d) Intranet A(n) _____ connects parts of the intranets of different organizations and allows secure communications among business partners. a) Global network b) Extranet c) Internet d) Intranet e) World Wide Web b) Extranet Internet service providers connect to one another through _____. a) Internet connection points b) Common carrier connection points c) Network access points d) Network connection points e) An extranet c) Network access points _____ are Internet access points that are located in public places, such as libraries and airports. a) Clients b) Servers c) Internet access computers d) Network computer e) Internet kiosks e) Internet kiosks Each site on the Internet gets an assigned address, which is a(n) _____.

a) TCP address b) IP address c) URL address d) ISO/OSI identifier e) World Wide Web address c) URL address Consider this domain name, www.business.gsu.edu. The "edu" is the _______. a) Top-level domain b) URL c) Web site locator d) Name of the computer e) Address of the Webmaster a) Top-level domain Consider this domain name, www.business.gsu.edu. The "gsu" is the __________. a) Top-level domain b) Name of the organization c) URL d) Name of the specific computer e) Address of the Webmaster b) Name of the organization Consider this domain name, www.business.gsu.edu. The "business" is the ________. a) Top-level domain b) Name of the organization c) URL d) Name of the specific computer e) Address of the Webmaster d) Name of the specific computer Applications offered by the Internet2 include which of the following? a) remote diagnosis b) digital libraries c) distance education d) virtual laboratories e) all of these e) all of these Networks enable which of the following applications? a) Discovery b) Communications c) Collaboration d) Web services e) All of these e) All of these

Which of the following are advantages of computer networks? a) They enable organizations to be more flexible. b) They enable companies to share hardware, computer applications, and data. c) They enable geographically dispersed employees to work together. d) They provide a critical link between businesses and their customers. e) All of these e) All of these Which network application(s) enable(s) users to access information located in databases all over the world? a) Discovery b) Communications c) Collaboration d) Web services e) None of these a) Discovery Which of the following statements about publication of material in foreign languages is not correct? a) It is a competitive necessity. b) It must be accurate. c) It is expensive. d) Content must be localized to the needs of people in local markets. e) It is not yet a major consideration for most companies. e) It is not yet a major consideration for most companies _____ portals offer content for diverse communities and are intended for broad audiences. a) Industrywide b) Personal c) Affinity d) Corporate e) Commercial e) Commercial _____ portals support communities such as hobby groups or political parties. a) Industrywide b) Personal c) Affinity d) Corporate e) Commercial c) Affinity _____ portals coordinate content within relatively narrow organizational and partners' communities.

a) Publishing b) Personal c) Affinity d) Corporate e) Commercial d) Corporate Many organizations have implemented corporate portals for which of the following reasons? a) To cut costs b) To free up time for busy managers c) To improve profitability d) To offer customers self-service opportunities e) All of these e) All of these Portals are an example of which network application? a) Discovery b) Collaboration c) Communications d) Web services e) None of these a) Discovery With _____, every call opens up a dedicated circuit for the duration of the call. a) Voice over IP b) Plain old telephone service c) Chat rooms d) Teleconference e) Internet relay chat b) Plain old telephone service With _____, phone calls are treated as just another kind of data. a) Voice over IP b) Plain old telephone service c) Chat rooms d) Teleconference e) Internet relay chat a) Voice over IP Skype is an example of _______. a) Teleconference b) Telepresence c) Plain old telephone service d) Voice over IP e) Videoconference

d) Voice over IP Workflow, groupware, and telepresence systems are examples of which network application? a) Discovery b) Communications c) Collaboration d) Web services e) None of these c) Collaboration The newest type of videoconferencing technology is ________. a) Teleconferencing b) Telepresence c) Work group analysis software d) Workflow software e) Groupware b) Telepresence In a _____ system, participants are able to seamlessly and electronically share data, voice, images, graphics, and animation. a) Teleconference b) Group decision support c) Telepresence d) Telephone conference call e) Crowdsourcing c) Telepresence The benefits of e-learning include which of the following? a) Increased content retention b) Current, high-quality content c) Consistency d) Flexibility e) All of these e) All of these Which of the following is not a disadvantage of telecommuting for employees? a) Fewer opportunities for housebound people b) Possible loss of fringe benefits c) Lower pay (in some cases) d) No workplace visibility e) Slower promotions a) Fewer opportunities for housebound people Refer to Opening Case - The Network Neutrality Wars: Which of the following is not a challenge for achieving net neutrality?

a) The amount of video traffic on the Internet is increasing. b) Under current models, the investment required to meet future demand exceeds projected revenue growth. c) Net neutrality might hinder U.S. competitiveness. d) Network providers could censor certain content by slowing down or blocking access. e) Telecommunications and cable companies are in favor of net neutrality....