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
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
A
Leased lines are ________. A. point-to-point connections between two premises B. always on 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
T1 leased lines run at a speed of about ________. A. 250 kbps B. 1 Mbps C. 10 Mbps D. 45 Mbps
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
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 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 Mps 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
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
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
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
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
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
A LAN 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
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
HSPA+ is a ________ service. A. 1G B. 2G C. 3G D. 4G
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
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 do not need to care about what is inside it D. all of the above
C
WANs are ________. A. single networks B. internets 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
Which of the following go from one customer site to another customer site? A. leased lines B. access lines C. both A and B
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