Data Comm - Chapter 10

A WAN is a 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

A

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

A

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

A

According to the ITU, which of the following may be advertised as 4G? A) LTE B) HSPA+ C) both A and B D) neither A nor B

A

Carrier access lines to residential buildings typically use ________. A) one-pair voice-grade UTP B) two-pair voice-grade UTP C) two-pair data-grade UTP D) four-pair UTP

A

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

A

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

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

In ________, switching decisions are based on destination addresses. A) ethernet B) PSDNs that use virtual circuits C) both A and B D) neither A nor B

A

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

A

Leased lines standards are most different around the world at speeds ________. A) below about 50 Mbps B) above about 50 Mbps C) Leased line speeds around the world are about equally different in both speed ranges

A

Metropolitan area Ethernet is used primarily ________. A) in MANs B) to link sites in distant cities C) both A and B D) neither A nor B

A

SONET/SDH lines use ________. A) optical fiber B) high-quality forms of data-grade UTP C) both A and B D) neither A nor B

A

Service quality issues with the Internet can be addressed by using ________. A) a single ISP B) multiple ISPs

A

The use of virtual circuits _________. A) reduces costs B) improves reliability C) both A and B D) neither A nor B

A

Using the Internet as a WAN is attractive because of ________. A) the Internet's low cost per bit B) the Internet's service quality C) both A and B D) neither A nor B

A

When a cellular customer moves from one city to another, this is ________. A) roaming B) a handoff C) both A and B D) neither A nor B

A

Which of the following are more widely used? A) T1 lines B) SONET lines C) Both are used about equally.

A

Which of the following go from one customer site to another customer site? A) leased lines B) access lines C) both A and B

A

Which of the following is a fractional T1 line speed? A) 128 kbps B) 1.544 Mbps C) both A and B D) neither A nor B

A

Which of the following is in Frame Relay's speed range? A) 10 Mbps B) 100 Mbps C) both A and B D) neither A nor B

A

Which of the following offers speeds that match speed range of greatest corporate demand for WAN transmission? A) Frame Relay B) ATM C) both A and B D) neither A nor B

A

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

A

E1 leased lines run at a speed of about ________. A) 250 kbps B) 2 Mbps C) 34 Mbps D) 45 Mbps

B

If I use Channel3 in a cell, I can reuse that same channel in an adjacent cell with ________. A) traditional cellular technology B) CDMA C) both A and B D) neither A nor B

B

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

B

Local loop access lines to business use which of the following transmission media? A) 1-pair data-grade UTP B) optical fiber C) both A and B D) neither A nor B

B

On what full 4G standard are carriers converging A) LTE B) LTE Advanced C) HSPA+ D) none of the above

B

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

B

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

B

When a cellular customer moves from one cell in a city to another cell in the same city, this is ________. A) cell switching B) a handoff C) cell hopping D) roaming

B

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

B

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

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

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

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.

B

Which of the following is true? A) "Roaming" means the same thing in cellular and 802.11 networks. B) "Handoff" means the same thing in cellular and 802.11 networks. C) Both A and B are true. D) Neither A nor B is true.

B

Which of the following offers true 4G speeds? A) LTE B) LTE Advanced C) HSPA+ D) all of the above

B

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

C

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

C

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

Combining multiple WAN technologies into a collectively managed system is called having ________. A) SNMP B) network visibility C) a virtual WAN D) WAN optimization

C

For surfing websites on the internet, what is the lowest generation of cellular service that would provide at least reasonably good access? A) 1G B) 2G C) 3G D) 4G

C

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

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

C

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

C

In the United States, to get a speed of at least 2.5 Mbps, you would use (a) ________ leased line(s). A) T1 B) fractional T1 C) bonded T1s D) none of the above

C

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

C

Leased line switched WANs typically use ________. A) leased lines B) a router at each site C) both A and B D) neither A nor B

C

Leased lines are ________. A) point-to-point connections between two premises B) always on C) both A and B D) neither A nor B

C

Low-speed leased lines use ________ transmission lines to the customer premises. A) one-pair voice-grade UTP B) one-pair data-grade UTP C) two-pair data-grade UTP D) four-pair UTP

C

The PSDN transport core normally is drawn as a cloud ________. A) because it has no internal structure B) for security reasons C) because customers don't need to care about what's inside it D) all of the above

C

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

C

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

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

C

Why is metro Ethernet popular? A) familiarity B) rapid reprovisioning C) both A and B D) neither A nor B

C

ATM ________. A) offers speeds in the range of greatest corporate demand B) is relatively inexpensive C) both A and B D) neither A nor B

D

According to the ITU, which of the following offers true 4G speeds? A) LTE B) HSPA+ C) both A and B D) neither A nor B

D

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

D