Deck 10: Wide Area Networks

Question 1

WANs are ________.

A)single networks
B)internets
C)either A or B
D)neither A nor B

Answer 1

C

Question 2

Which of the following go from one customer site to another customer site?

A)leased lines
B)access lines
C)both A and B

Answer 2

A

Question 3

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.

Answer 3

B

Question 4

The general name for a company that is given rights of way to lay wires through public areas is carrier.

Question 5

A company has more control over its ________ technology.

A)LAN
B)WAN

Question 6

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

Question 7

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

Question 8

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

Question 9

LANs are ________.

A)single networks
B)internets
C)either A or B
D)neither A nor B

Question 10

The Internet is a ________.

A)LAN
B)WAN
C)both A and B
D)neither A nor B

Question 11

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

Question 12

Which of the following usually offers higher speeds?

A)MANs
B)WANs
C)Both A and B are about equal in typical speeds.

Question 13

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

Question 14

Leased lines are ________.

A)point-to-point connections between two premises
B)always on
C)both A and B
D)neither A nor B

Question 15

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

Question 16

A network that runs on the customer premises is a ________.

A)LAN
B)WAN
C)both A and B
D)neither A nor B

Question 17

WAN prices are closely related to carrier costs.

Question 18

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

Question 19

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

Question 20

UTP transmission in WANs is normally limited to about 100 meters.

Question 21

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

Question 22

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

Question 23

All SONET/SDH leased lines run faster than 50 Mbps.

Question 24

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

Question 25

Which of the following DSL services usually offers QoS guarantees?

A)residential
B)business
C)both A and B
D)neither A nor B

Question 26

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.

Question 27

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

Question 28

In ADSL,the customer should have ________.

A)splitters
B)an ADSL modem
C)both A and B
D)neither A nor B

Question 29

T1 leased lines run at a speed of about ________.

A)250 kbps
B)1 Mbps
C)10 Mbps
D)45 Mbps

Question 30

Which of the following DSL services usually offers QoS guarantees?

A)residential
B)business
C)both A and B
D)neither A nor B

Question 31

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

Question 32

The slowest offered SONET/SDH leased lines run at about 50 Mbps.

Question 33

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

Question 34

Which of the following are more widely used?

A)T1 lines
B)SONET lines
C)Both are used about equally.

Question 35

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

Question 36

DSL throughput is typically sensitive to distance from the nearest switching building.

Question 37

E1 leased lines run at a speed of about ________.

A)250 kbps
B)2 Mbps
C)34 Mbps
D)45 Mbps

Question 38

ADSL offers symmetric service.

Question 39

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

Question 40

In ADSL,the residential customer needs a(n)________.

A)DSLAM
B)ADSL modem
C)both A and B
D)neither A nor B

Question 41

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

Question 42

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

Question 43

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

Question 44

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

Question 45

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

Question 46

Service quality issues with the Internet can be addressed by using ________.

A)a single ISP
B)multiple ISPs

Question 47

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

Question 48

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

Question 49

Frame Relay frames contain ________.

A)destination addresses
B)virtual circuit numbers

Question 50

Two-way amplifiers are needed for cable ________ service.

A)television
B)data
C)both A and B
D)neither A nor B

Question 51

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

Question 52

The use of virtual circuits ________.

A)reduces costs
B)improves reliability
C)both A and B
D)neither A nor B

Question 53

To deliver signals to individual residences,cable television companies primarily use coaxial cable.

Question 54

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

Question 55

Why is metro Ethernet popular?

A)familiarity
B)rapid reprovisioning
C)both A and B
D)neither A nor B

Question 56

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

Question 57

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

Question 58

In a PSDN,customers connect to the network core at ________.

A)NAPs
B)public/private access points
C)POPs
D)DSLAMs

Question 59

Metro Ethernet offers relatively high speeds and low costs.

Question 60

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

Question 61

HSPA+ is a ________ service.

A)1G
B)2G
C)3G
D)4G

Question 62

In cellular technology,a ________ is a small geographical area.

A)cell
B)cellsite
C)both A and B
D)neither A nor B

Question 63

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

Question 64

Which of the following offers true 4G speeds?

A)LTE
B)LTE Advanced
C)HSPA+
D)all of the above

Question 65

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

Question 66

If I use Channel3 in a cell,I can reuse that same channel in an adjacent cell with CDMA cellular technology.

Question 67

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.

Question 68

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

Question 69

On what full 4G standard are carriers converging?

A)LTE
B)LTE Advanced
C)HSPA+
D)none of the above

Question 70

"Handoff" means the same thing in cellular and 802.11 networks.

Question 71

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

Question 72

Cells are used in cellular telephony to provide ________.

A)service for more customers
B)greater reliability
C)greater speed
D)all of the above

Question 73

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

Question 74

In cellular technology,a cellsite is a small geographical area.

Question 75

By regulation,cellular systems must give almost the same throughput at different times during the day.

Question 76

If I use Channel3 in a cell,I can reuse that same channel in an adjacent cell with traditional cellular technology.

Question 77

By regulation,cellular systems must give almost the same throughput at different places in their service areas.

Question 78

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

Question 79

Cellular technology was created to support more customers in a single area.

Question 80

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