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WU BU 309 - Study Notes

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Name: __________________________ Date: _____________1. ____________ are companies that build a data and telecommunications infrastructure from which other companies can lease services for WANs and MANs.A) Common carriersB) Router manufacturersC) Standards organizationsD) CSUsE) PUCs2. Each state or Canadian province has its own ___________ to regulate communications within its borders.A) CRTCB) Federal Communications CommissionC) common carriersD) public utilities commissionE) PTT3. The _________________ is a Canadian government agency that regulates voice and data communication.A) PSTNB) FCCC) CRTCD) CSUE) POTS4. Which of the following is not one of the large interexchange carriers operating in North America today?A) SprintB) DSUPage 1C) MCI WorldcomD) AT&TE) none of the above is an IEC5. ________ is a type of WAN connection that uses the normal voice telephone network.A) ATMB) Dial-up serviceC) T-Carrier servicesD) Digital Subscriber LineE) X.256. When a person uses a regular modem to make a connection to an Internet service provider through POTS, the data travels over a:A) dedicated circuitB) dialed circuitC) ISDN circuitD) VPN circuitE) T-1 carrier circuit7. Special rate services that allow dialed circuit calls for both voice communications and data transmission to be purchased in large quantities are known as __________A) DSLB) RBOCC) ATMD) WATSE) X.258. Which of the following is not a problem with dialed circuits?A) Data transmission rates on dialed circuits are relatively low.Page 2B) Dialed circuits may vary in quality.C) Transmission rates for dialed circuits can vary with each call.D) It is hard to predict if a given connection will be clear or noisy.E) Use of these circuits is very simple.9. Adoption of narrowband ISDN in North America has been:A) fastB) slowC) rapidD) non existent, since it is not offered in North AmericaE) none of the above10. A ____________ identifies each device connected to an ISDN network terminator.A) NICB) MAC addressC) SPIDD) PRIE) BRI11. Basic rate interface:A) is typically offered only to commercial customersB) provides a communications circuit with two 64 Kbps B channels, plus one D channelC) is defined exactly the same way in EuropeD) has an upper capacity of 1.544 MbpsE) is comprised of analog circuits only12. Primary rate interface:A) is typically offered only to commercial customersPage 3B) provides a communications circuit with two 64 Kbps B channels, plus one D channelC) is defined exactly the same way in EuropeD) has an upper capacity of 128KbpsE) is comprised of analog circuits only13. One type of Broadband ISDN service is intended to be used for digital broadcast television:A) analog serviceB) asymmetrical service with two simplex channelsC) one full duplex channel operating at 155.52 MbpsD) packet-switched serviceE) one full duplex channel operating at 622.08 Mbps14. A ___________ is/are devices that permit a user to connect to a digital T-carrier service.A) modemB) codecC) CSU/DSUD) NICE) ATM15. Which of the following is not a basic architecture for dedicated circuit networks?A) ringB) partial meshC) busD) starE) fully interconnected meshPage 416. A ________ geometric layout connects all computers in a closed loop, with each computer linked to the next usually with a series of point-to-point dedicated circuits.A) bus designB) star designC) full mesh designD) ring designE) partial mesh design17. In a ring design WAN,A) messages can take a long time to travel from the sender to the receiverB) a message arrives at all computers on the network simultaneouslyC) messages always arrive faster than in other types of layoutsD) messages are delivered directly from sender to receiver because there is a point-to-point connection directly between each sender and each receiverE) messages always take one second to travel between sender and receiver18. In a ring design WAN,A) failure in one circuit means that the network can most likely continue to functionB) failure in one circuit always means that the network will cease to functionC) failure in one computer always means that the network will cease to functionD) failure in one circuit means that there will not be any increased traffic delays in the networkE) failure in one computer always means that messages will stop at that computer sinceit would be impossible to re-route traffic19. A star architecture:A) connects all computers in a closed loopB) connects all computers off a backbone circuitC) connects all computers to one central computer that routes messages to the appropriate computerD) all of the aboveE) none of the abovePage 520. A _______ geometric layout for a WAN connects all computers to one central computer that routes messages to the appropriate computer, usually via a series of point-to-point dedicated circuits.A) ring designB) mesh designC) bus designD) star designE) the circular design21. A star topology is:A) difficult to manage because the central computer receives and routes all messages inthe networkB) dependent upon the capacity of the central computer for its performanceC) always slower than a ring networkD) less susceptible to traffic problems than other architecturesE) not affected if the central computer fails22. In ______ geometric layout for a network, every computer is connected to every other computer often by point-to-point dedicated circuits.A) full mesh designB) ring designC) star designD) bus designE) partial mesh design23. Mesh networks:A) usually provide relatively long routes through the network (compared to ring networks)B) require more processing by each computer in the network than in star or ring networksC) do not use decentralized routingPage 6D) do not have much capacity wasted by network status informationE) do not have many possible routes through the network to prevent one circuit from becoming overloaded24. _____ are dedicated digital circuits that are the most commonly used form of dedicated circuit services in North America today.A) Wideband analog servicesB) SMDSC) ATMD) T-carrier servicesE) ISDN25. The data rate for a T-1 circuit in North America is:A) 1.544 MbpsB) 6.312 MbpsC) 44.376 MbpsD) 274.176 MbpsE) 1.544 Gbps26. In North America, a T1 circuit has ______ 64Kbps channels.A) 2B) 30C) 24D) 12E) 3627. The data rate for a T-3 circuit in North America is:A) 1.544 MbpsB) 6.312 MbpsPage 7C) 44.376 MbpsD) 274.176 MbpsE) 1.544 Gbps28. SONET:A) is a standard for optical transmission that currently operates at Terabit per second speedsB) is very


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