Chapter11 Essay

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1. The Internet can transfer conventional data and voice data.
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T
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2. It wasn’t until the 1950s that POTS began carrying computer data signals as well as voice signals.
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F
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3. Only two wires are required to complete a telephone circuit.
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T
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4. A trunk has a unique telephone number associated with it.
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F
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5. Subscriber loops usually transmit digital signals, which require amplifiers every few kilometers.
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F
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6. Prior to 1984, AT (American Telephone and Telegraph) owned all the long-distance telephone lines in the United States.
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T
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7. Telephone systems were originally designed to transmit the human voice.
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T
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8. The more information you wish to send over a medium, the lower the frequency of the signal you need to represent that information.
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F
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9. When they were originally introduced many years ago, dial-up modems were capable of data transfer speeds of merely 15 to 30 bits per second.
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F
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10. A V.92 modem can place a data connection on hold should someone call the user’s telephone number.
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T
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11. An asymmetric service is useful for an Internet connection in which the bulk of the traffic comes down from the Internet to the workstation.
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T
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12. Most residential DSL services are symmetric.
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F
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13. There is only one DSL format in use today.
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F
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14. A cable modem is a physical device that separates the computer data from the cable television video
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T
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15. Cable modem connections are typically symmetric.
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F
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16. The most popular example of a leased line service is the T-1.
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T
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17. Quarter-T-1 and half-T-1 lines are called fractional T-1 services.
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T
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18. The frame relay service can only be a long-distance service.
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F
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19. Frame relay is called a layer 6 protocol.
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F
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20. Typically, frame relay is a replacement for the leased lines that connect a business to other businesses or connect multiple offices of the same business.
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T
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21. Local high-speed telephone connections are almost always less expensive than long-distance, high-speed telephone connections.
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T
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22. The price of the PVC is inversely proportional to the CIR level.
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F
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23. Frame relay was originally designed and used to transfer packets of data between two sites more cost effectively than leased lines could.
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T
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24. ATM transfer rates are as fast as 311 Mbps.
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F
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25. A real-time interactive application is one of the most demanding with respect to data transmission rate and network throughput.
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T
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26. DSL and cable modems are more expensive than frame relay systems at comparable speeds.
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F
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27. Convergence has had a particularly noticeable impact on the telecommunications market.
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T
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28. ATM clearly dominates in the local area network arena.
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F
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29. A company that wishes to have its own in-house telephone system will often buy or lease a PBX.
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T
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30. Frame relay and ATM are losing market share to Internet services such as FTP and Telnet.
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F
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1. The local loop commonly consists of either four or ____ wires. a. six c. nine b. eight d. ten
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b. eight
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2. On the other end of the local loop is the local telephone company’s ____. a. trunk c. central office b. interLATA d. intraLATA
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c. central office
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3. As long as a telephone call remains within a LATA (a(n) ____ call), the telephone call is local and is handled by a local telephone company. a. intraLATA c. outerLATA b. extraLATA d. outLATA
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a. intraLATA
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4. If the telephone call passes out of one LATA and into another (a(n) ____ call), the telephone call is long distance and must be handled by a long-distance telephone company. a. intraLATA c. inLATA b. innerLATA d. interLATA
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d. interLATA
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5. The telephone network consists of two basic types of telephone lines: a subscriber loop, or standard telephone line, and a ____. a. trunk c. LATA b. CIR d. SONET
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a. trunk
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6. After the 1984’s Modified Final Judgment, the long-distance telephone companies became known as ____. a. local exchange carriers (LECs) c. interexchange carriers (IECs or IXCs) b. central office exchange service d. private branch exchange (PBXs)
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c. interexchange carriers (IECs or IXCs)
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7. A(n) ____ is a service from local telephone companies in which up-to-date telephone facilities at the telephone company’s central (local) office are offered to business users, so that they don’t need to purchase their own facilities. a. local exchange carriers (LECs) c. interexchange carriers (IECs or IXCs) b. central office exchange service d. private branch exchange (PBXs)
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b. central office exchange service
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8. A(n) ____ handles all in-house calls and places calls onto outside telephone lines. a. local exchange carriers (LECs) c. interexchange carriers (IECs or IXCs) b. local access transport area (LATA) d. private branch exchange (PBXs)
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d. private branch exchange (PBXs)
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9. ____ are permanent direct connections between two specified points. a. Tie lines c. Centrex b. PBXs d. IPX
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a. Tie lines
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10. The Telecommunications Act of 1996 mandated that the existing local telephone companies, now called ____, must give CLECs access to their telephone lines. a. private Branch Exchange (PBX) b. Centrex (central office exchange service) c. incumbent local exchange carriers (ILECs) d. interexchange carriers (IECs)
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c. incumbent local exchange carriers (ILECs)
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11. The ____ standard is a 56,000-bps dial-up modem standard approved by a standards-making organization rather than a single company. a. R.56 c. 802.11Q b. V.90 d. 803.1
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b. V.90
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12. A(n) ____ connection is one in which the transfer speeds in both directions are equal. a. symmetric c. static b. asymmetric d. dynamic
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a. symmetric
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13. A(n) ____ connection has a faster downstream transmission speed than its upstream speed. a. symmetric c. asymmetric b. static d. dynamic
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c. asymmetric
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14. Because DSL is an always-on connection, it uses a ____ circuit instead of a switched circuit. a. changing c. virtual b. dynamic d. permanent
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d. permanent
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15. When no splitter is used to separate the DSL signal from the POTS signal, then the service is called ____. a. asymmetric DSL c. symmetric DSL b. splitterless DSL d. POTSless DSL
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b. splitterless DSL
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16. Digital subscriber line comes in a variety of formats. Often collectively referred to as ____. a. ADSL c. SDSL b. CDSL d. xDSL
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d. xDSL
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17. ____ is a popular format that transmits the downstream data at a faster rate than the upstream rate. a. Asymmetric digital subscriber line (ADSL) b. Consumer DSL (CDSL) c. DSL Lite d. High bit-rate DSL (HDSL)
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a. Asymmetric digital subscriber line (ADSL)
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18. ____ is a trademarked version of DSL with speeds that are a little slower than typical ADSL speeds. a. Asymmetric digital subscriber line (ADSL) b. DSL Lite c. Consumer DSL (CDSL) d. High bit-rate DSL (HDSL)
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b. DSL Lite
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19. ____ is the earliest form of DSL. a. DSL Lite c. Very high data rate DSL (VDSL) b. High bit-rate DSL (HDSL) d. Rate-adaptive DSL (RADSL)
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b. High bit-rate DSL (HDSL)
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20. ____ is a format in which the transfer rate can vary, depending on noise levels within the telephone line’s local loop. a. DSL Lite c. Very high data rate DSL (VDSL) b. High bit-rate DSL (HDSL) d. Rate-adaptive DSL (RADSL)
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d. Rate-adaptive DSL (RADSL)
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21. A ____ service is an all-digital connection that can transfer either voice or data at speeds up to 1.544 Mbps. a. T-1 c. T-3 b. T-2 d. T-4
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a. T-1
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22. ____ is a packet-switched network that was designed for transmitting data over fixed lines. a. T-1 c. Frame relay b. IntraLATA d. InterLATA
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c. Frame relay
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23. The designation layer ____ protocol means that frame relay technology is only one part of a network application and resides at the data link layer. a. 2 c. 4 b. 3 d. 6
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a. 2
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24. When a customer establishes a permanent virtual circuit with a frame relay carrier, both customer and carrier agree on a data transfer rate called the ____. a. bit rate c. committed information rate (CIR) b. PVC rate d. LATA rate
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c. committed information rate (CIR)
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25. The ____ allows the customer to exceed the committed information rate by a fixed amount for brief moments of time. a. bit rate c. committed information rate (CIR) b. burst rate d. LATA rate
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b. burst rate
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26. Before ATM can transfer any data, you must first create a logical connection called a ____. a. virtual path connection (VPC) c. network-network interface b. virtual channel connection (VCC) d. network-user interface
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b. virtual channel connection (VCC
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27. A ____ is a bundle of VCCs that have the same endpoints. a. virtual path connection (VPC) c. network-network interface b. virtual interface connection (VIC) d. network-user interface
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a. virtual path connection (VPC)
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28. When a VCC transmits network management and routing signals, it is called the ____. a. virtual path connection (VPC) c. network-network interface b. virtual interface connection (VIC) d. network-user interface
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c. network-network interface
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29. ____ is the most expensive ATM class of service. a. Variable bit rate (VBR) c. Unspecified bit rate (UBR) b. Available bit rate (ABR) d. Constant bit rate (CBR)
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d. Constant bit rate (CBR)
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30. ____ applications often send bursts of data, and the ATM network guarantees that its traffic is delivered on time. a. Variable bit rate (VBR) c. Unspecified bit rate (UBR) b. Available bit rate (ABR) d. Constant bit rate (CBR)
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a. Variable bit rate (VBR)
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31. ____ is capable of sending traffic that may experience bursts of data, but there are no promises as to when the data may be sent. a. Variable bit rate (VBR) c. Unspecified bit rate (UBR) b. Available bit rate (ABR) d. Constant bit rate (CBR)
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c. Unspecified bit rate
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32. ____ means that users utilize a single desktop application to send and receive e-mail, voice mail, and fax. a. Interactive voice response c. Fax processing b. Unified messaging d. Third-party call control
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b. Unified messaging
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33. ____ means that a user calling into a company telephone system provides some form of data by speaking into the telephone, and a database query is performed using this spoken information. a. Third-party call control b. Unified messaging c. Fax-back d. Integrated voice recognition and response
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d. Integrated voice recognition and response
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34. In ____, a fax image that is stored on a LAN server’s hard disk can be downloaded over a local area network, converted by a fax card, and sent out to a customer over a trunk. a. third-party call control c. fax processing b. unified messaging d. integrated voice recognition and response
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c. fax processing
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35. ____ means that users have the ability to control a call—for example, set up a conference call—without being a part of it. a. Third-party call control b. Unified messaging c. Fax-back d. Integrated voice recognition and response
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a. Third-party call control
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36. ____ means that different icons on a computer screen represent common PBX functions such as call hold, call transfer, and call conferencing, making the system easier for operators to use. a. Third-party call control c. Fax-back b. PBX graphic user interface d. Call filtering
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b. PBX graphic user interface
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37. ____ means that users can specify telephone numbers that are allowed to get through. a. PBX graphic user interface c. Fax-back b. Customized menuing system d. Call filtering
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d. Call filtering
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38. MPLS and VPNs continue to replace which long-distance data services? a. Google and Yahoo c. frame relay and ATM b. Telnet and FTP d. frame relay and FTP
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c. frame relay and ATM

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