Business Networks Chapter 10

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

A

13) 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

A

17) 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

A

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

A

22) 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

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

A

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

A

27) 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

A

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

A

32) 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

A

36) 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

A

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

A

42) 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

A

44) 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

A

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

A

48) 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

A

1) 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

B

10) 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

B

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

B

20) 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

B

3) 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.

B

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

B

31) 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

B

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

B

35) 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

B

38) 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

39) 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

B

49) 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

B

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

B

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

B

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

C

14) 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

C

18) 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

C

2) 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

C

21) 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

C

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

C

25) 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

C

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

C

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

C

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

C

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

C

45) 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

C

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

C

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

C

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

C

9) 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

C

15) 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

D

4) 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

D

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

D

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

D