Chapter 10

C

18) The PSTN core is organized as a ________. A) mesh B) hierarchy C) modified hierarchy D) loop

A

26) The promise of FTTH is ________. A) higher speed B) lower cost C) both A and B D) neither A nor B

A

5) A company has more control over its ________ technology. A) LAN B) WAN

C

50) In a PSDN, customers connect to the network core at ________. A) NAPs B) public/private access points C) POPs D) DSLAMs

C

53) Why is Carrier Ethernet popular? A) It uses a familiar technology. B) It has attractive prices. C) both A and B D) neither A nor B

C

64) Traffic shaping ________. A) limits the amount of some types of traffic B) does not admit some types of traffic C) both A and B D) neither A nor B

D

65) The highest layer in SDN consists of ________. A) switches B) routers C) the SDN controller D) SDN applications

B

66) The creation of routing tables for a router is an example of ________. A) forwarding B) control C) both A and B D) neither A nor B

B

14) Which of the following allows you to connect to the hosts of almost any corporation today? A) carrier WANs B) the Internet C) both A and B

B

15) How do WAN carriers typically get their trunk lines? A) They construct them. B) They lease them from telephone companies. C) They use wireless transmission. D) They use the Internet.

D

16) In the telephone system, the lines that connect customers to the nearest switch are called the ________. A) access lines B) local lines C) access loop D) local loop

C

19) DSL offers ________. A) voice transmission B) data transmission C) both A and B D) neither A nor B

C

2) A LAN is the network that ________. A) links different sites together B) provides service within a company C) provides service within a site D) all of the above

B

20) DSL residential service provides ________. A) symmetric speed B) asymmetric speed C) both A and B D) neither A nor B

C

21) What transmission medium do ALL DSL services use? A) one-pair data-grade UTP B) two-pair data-grade UTP C) one-pair voice-grade UTP D) all of the above

B

22) Which of the following already runs to nearly all customer premises? A) 4-pair UTP B) 1-pair VG UTP C) 1-pair DG UTP D) none of the above

C

23) In ADSL, the customer should have ________. A) splitters B) an ADSL modem C) both A and B D) neither A nor B

B

24) In ADSL, the residential customer needs a(n) ________. A) DSLAM B) ADSL modem C) both A and B D) neither A nor B

A

25) For ADSL service, which of the following typically must be added to the telephone system? A) a DSLAM B) a transmission line to the customer premises C) both A and B D) neither A nor B

A

27) Fiber to the home service is normally created by ________. A) running optical fiber to neighborhoods B) running individual fiber cords from the nearest switching building to individual homes C) both A and B D) neither A nor B

C

28) For their transmission medium, cable television companies primarily use ________. A) 2-pair VG UTP cabling B) 2-pair DG UTP cabling C) coaxial cable D) 4-pair UTP

D

29) In coaxial cable, the two conductors ________. A) run side-by-side B) are twisted around each other C) both A and B D) neither A nor B

A

3) A WAN is the network that ________. A) links different sites together B) provides service within about a mile C) provides service within a site D) all of the above

B

30) Two-way amplifiers are needed for cable ________ service. A) television B) data C) both A and B D) neither A nor B

A

31) Compared to ADSL service, cable modem service typically is ________. A) faster and more expensive B) faster and less expensive C) slower and more expensive D) slower and less expensive

C

32) Which of the following is moving toward FTTH? A) cable modem service companies B) ADSL service companies C) both A and B D) neither A nor B

A

33) In cellular technology, a ________ is a small geographical area. A) cell B) cellsite C) both A and B D) neither A nor B

B

34) In cellular technology, the carrier antenna and equipment to which mobile customers connect directly is called a(n) ________. A) cell B) cellsite C) MTSO D) wireline carrier

C

35) An MTSO ________. A) controls cellsites in a cellular system B) links mobile users to wired telephone customers C) both A and B D) neither A nor B

A

36) Cells are used in cellular telephony to provide ________. A) service for more customers B) greater reliability C) greater transmission speed D) all of the above

A

37) Today's dominant cellular technology is ________. A) LTE B) 3G C) HSPA+ D) MTSO

C

38) What speed does the LTE Advanced standard require downstream? A) 3 Mbps B) 30 Mbps C) 3 Gbps D) 30 Gbps

C

39) Which of the following affects what throughput an individual user will receive? A) being in a moving car B) being far from the cellsite C) both A and B D) neither A nor B

A

4) Companies use carriers for WAN transmission because ________. A) companies lack rights of way B) carriers have extremely strong security C) both A and B D) neither A nor B

A

40) Leased lines offer ________ service. A) fast B) any-to-any C) rapid-connection D) none of the above

A

41) Which lines run from one customer premise to another? A) leased lines B) access lines C) both A and B D) neither A nor B

B

44) T1 leased lines run at a speed of about ________. A) 250 kbps B) 1 Mbps C) 10 Mbps D) 45 Mbps

B

45) To connect two sites at 2.8 Mbps, I would use ________. A) a T1 line B) bonded T1 lines C) a T2 line D) a T3 line

A

46) Many "T1" lines that carriers provide today use ________ in the local loop. A) 1-pair voice-grade UTP B) 2-pair voice-grade UTP C) 1-pair data-grade UTP D) 2-pair data-grade UTP

B

51) The PSDN technology that is growing rapidly today is ________. A) Frame Relay B) Carrier Ethernet C) the Internet D) No PSDN technology is growing rapidly today.

A

52) In Carrier Ethernet, which service is a competitor for leased line service? A) E-Line B) E-LAN C) both A and B D) neither A nor B

B

54) In MPLS, the router interface to send the packet back out will be decided ________. A) during the router's routing process B) before the packet arrives C) by a dynamic routing protocol D) none of the above

A

55) MPLS ________ the work that each router must do to deliver a packet during a traffic exchange. A) reduces B) increases C) does not affect D) occasionally reduces

C

56) In MPLS, the packet travels along the ________. A) route B) data link C) label-switched path D) MPLS path

B

57) In MPLS, the ________ adds the label to the packet. A) source host B) first label-switching router C) both A and B D) neither A nor B

B

58) MPLS routers base their decisions on a packet's ________. A) destination IP address B) label number C) both A and B D) neither A nor B

A

59) MPLS is ________ the source and destination hosts. A) transparent to B) nontransparent to C) apparent to D) a burden on

D

6) LAN speeds are faster than WAN speeds. This is because of ________. A) technological limitations B) regulatory limitations C) slow corporate adoption of newer WAN technologies D) economic reasons

D

60) Label-switching routers bring ________. A) lower cost B) the ability to do traffic engineering C) quality of service D) all of the above

A

61) WAN optimization devices are deployed ________. A) at the ends of leased lines B) by the telephone carrier C) by the PSDN carrier D) by the ISP

C

62) WAN optimization provides ________. A) network protocol acceleration B) caching C) both A and B D) neither A nor B

A

63) In caching, ________. A) a message may not have to be transmitted B) messages are cached at the transmitting end of the line C) both A and B D) neither A nor B

C

67) Forwarding functions are located in routers in ________. A) traditional routing B) SDN C) both A and B D) neither A nor B

A

68) Control functions are located in routers in ________. A) traditional routing B) SDN C) both A and B D) neither A nor B

C

69) SDN can ________. A) permit routing rules to be changed rapidly B) reduces router costs C) both A and B D) neither A nor B

B

7) Which of the following has more diversity in technologies? A) LANs B) WANs C) Both A and B are about equal in diversity of technologies.

A

70) SDN ________. A) reduces CapEx B) increases OPEx C) both A and B D) neither A nor B

A

71) In SDN, a switch receives its forwarding table rules directly from ________. A) the SDN controller B) an SDN management application C) another switch D) an SNMP manager

B

74) OpenFlow can be used to standardize ________. A) northbound APIs B) southbound APIs C) both A and B D) neither A nor B

A

8) Which of the following usually offers higher speeds? A) LANs B) WANs C) Both A and B are about equal in typical speeds.

C

9) LANs are ________. A) single networks B) local internets C) either A or B D) neither A nor B

D

17) Most end-office switches are Class ________ switches. A) 1 B) 2 C) 3 D) 5

C

42) To use a leased line, the customer requires a(n) ________ at each site. A) switch B) router C) CSU/DSU D) modem

A

43) A customer's leased line to its ISP connects to the ISP's ________. A) POP B) NAP C) CSU/DSU D) interface

B

47) Which of the following DSL services tends to be symmetric in speed? A) residential B) business C) both A and B D) neither A nor B

B

48) Which of the following DSL services usually offers QoS guarantees? A) residential B) business C) both A and B D) neither A nor B

C

49) A firm uses a PSDN. It has four sites. How many leased lines will it need? A) 0 B) 1 C) 4 D) none of the above

B

72) A router's load-balancing process is determined by ________. A) the SDN controller B) an SDN application C) the router D) any of the above

A

73) Communication between SDN applications and SDN controllers is governed by ________. A) northbound APIs B) southbound APIs C) both A and B D) neither A nor B

A

1) A network that runs on the customer premises is a ________. A) LAN B) WAN C) both A and B D) neither A nor B

C

10) WANs are ________. A) single networks B) internets C) either A or B D) neither A nor B

B

11) The Internet is a ________. A) LAN B) WAN C) both A and B D) neither A nor B

B

12) Which of the following does the carrier NOT own? A) the network core B) customer premises equipment C) both A and B D) neither A nor B

C

13) Which of the following is a common use for carrier WANs? A) to connect corporate sites B) to connect a corporate site to the Internet C) both A and B D) neither A nor B