Deck 10: Carrier Wide Area Networks Wans

Question 1

The PSTN core is organized as a ________.

A) mesh
B) hierarchy
C) modified hierarchy
D) loop

Answer 1

C

Question 2

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

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

Answer 2

A

Question 3

LAN speeds are faster than WAN speeds because of ________.

A) technological limitations
B) regulatory limitations
C) slow corporate adoption of newer WAN technologies
D) economic reasons

Answer 3

D

Question 4

LANs are ________.

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

Question 5

Compared to the Internet,carrier WANs ________.

A) offer higher-quality service
B) can reach more customers
C) both A and B
D) neither A nor B

Question 6

Which of the following receive rights of way for transmission beyond sites?

A) corporations
B) carriers
C) both A and B
D) neither A nor B

Question 7

In a telephone system,the lines that connect customers to the nearest switch are called ________.

A) trunk lines
B) local lines
C) the access loop
D) the local loop

Question 8

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.

Question 9

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

Question 10

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

Question 11

Which of the following usually offers higher speeds?

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

Question 12

A company has more control over its ________ technology.

A) LAN
B) WAN
C) It has about equal control over both.

Question 13

MAN speeds are faster than WAN speeds because of ________.

A) technological limitations
B) regulatory limitations
C) slow corporate adoption of newer WAN technologies
D) economic reasons

Question 14

The Internet is a ________.

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

Question 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.

Question 16

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 17

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

Question 18

DSL offers ________.

A) voice transmission
B) data transmission
C) both A and B
D) neither A nor B

Question 19

WANs include ________.

A) single networks
B) the Internet
C) either A or B
D) neither A nor B

Question 20

Most end-office switches are Class ________ switches.

A) 1
B) 2
C) 4
D) 5

Question 21

DSL residential service provides ________.

A) symmetric speed
B) asymmetric speed
C) both A and B
D) neither A nor B

Question 22

Fiber to the home service is normally offered by ________.

A) cable television companies
B) telephone companies
C) both A and B
D) neither A nor B

Question 23

Compared to ADSL service,cable modem traditionally has been ________.

A) faster and more expensive
B) faster and less expensive
C) slower and more expensive
D) slower and less expensive

Question 24

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) none of the above

Question 25

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 26

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

Question 27

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 28

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) 2-pair DG UTP

Question 29

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

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

Question 30

In ADSL,the customer should have ________.

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

Question 31

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 32

Two-way amplifiers are needed for cable ________ service.

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

Question 33

If a cellsite uses Channel 237,which other cellsites can reuse the channel?

A) adjacent cellsites
B) cellsites one beyond adjacent cells
C) cellsites two beyond adjacent cells
D) no other cellsites

Question 34

Asymmetric residential service is good for ________.

A) the World Wide Web
B) videoconferencing
C) both A and B
D) neither A nor B

Question 35

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

Question 36

For cable modem service,customers need ________.

A) cable modems
B) splitters
C) both A and B
D) neither A nor B

Question 37

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

Question 38

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

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

Question 39

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

Question 40

The promise of FTTH is ________.

A) higher speed
B) lower cost
C) both A and B
D) neither A nor B

Question 41

If you need speeds of 16 Mbps between two corporate sites in the United States,you would need a ________ leased line.

A) T1
B) T3
C) OC3
D) none of the above

Question 42

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

Question 43

In cellular technology,G stands for ________.

A) goodness
B) grade
C) ground wave
D) generation

Question 44

If you need speeds of 1.2 Mbps between two corporate sites in the United States,you would need a ________ leased line.

A) T1
B) T3
C) OC3
D) none of the above

Question 45

Decent data transmission for Web surfing began with ________ technology.

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

Question 46

Leased lines offer ________ service.

A) fast
B) any-to-any
C) both A and B
D) neither A nor B

Question 47

Compared to the Internet,Layer 2 and Layer 3 carrier WAN services usually ________.

A) offer QoS guarantees
B) require less management labor in the customer organization
C) both A and B
D) neither A nor B

Question 48

Many T1 lines are ________.

A) optical fiber lines
B) Asymmetric DSL lines
C) Symmetric DSL lines
D) none of the above

Question 49

Which of the following affects what cellular 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

Question 50

T1 leased lines run at a speed of about ________.

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

Question 51

A customer's leased line to its ISP connects to the ISP's ________.

A) POP
B) terminal point
C) CSU/DSU
D) interface

Question 52

In Carrier Ethernet,which connects multiple distant sites into a single Ethernet network?

A) E-Line service
B) E-LAN service
C) both A and B
D) neither A nor B

Question 53

How does carrier Ethernet differ from traditional Ethernet?

A) It is offered by carriers instead of being installed and managed by the company using it.
B) It is for MAN and WAN services.
C) both A and B
D) neither A nor B

Question 54

Many lines sold as T1 lines actually use ________.

A) 1-pair voice-grade UTP
B) 1-pair data-grade UTP
C) 2-pair data-grade UTP
D) optical fiber

Question 55

To use a leased line,the customer must have a(n)________ at each site.

A) compatible switch
B) compatible router
C) CSU/DSU
D) modem

Question 56

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

Question 57

5G will bring ________.

A) higher speeds than 4G
B) energy-efficient low speeds
C) both A and B
D) neither A nor B

Question 58

Which generation is now bringing speeds of about 10 Mbps?

A) 2G
B) 3G
C) 4G
D) 5G

Question 59

When carriers use the terms "4G" and "5G," they use these terms in ways that comply with standards.

Question 60

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

Question 61

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

Question 62

MPLS brings ________.

A) lower cost than the Internet
B) the ability to do traffic engineering
C) both A and B
D) neither A nor B

Question 63

MPLS is ________ the source and destination hosts.

A) transparent to
B) nontransparent to
C) apparent to
D) a burden on

Question 64

Which of the following is the most expensive to use?

A) Traditional routing
B) MPLS
C) carrier Ethernet
D) the Internet

Question 65

Which of the following reduces traffic?

A) compression
B) traffic shaping
C) both A and B
D) neither A nor B

Question 66

In MPLS,if two packets arrive in order going to the same IP address,MPLS will ________.

A) send the second on doing a simple cache lookup
B) go through the entire routing process for the second packet
C) do a simple table lookup for the second packet
D) none of the above

Question 67

Traffic shaping reduces traffic by ________.

A) preventing certain undesirable traffic from entering the network
B) limiting the amount of certain undesirable traffic entering the network
C) both A and B
D) neither A nor B

Question 68

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

Question 69

Why is Carrier Ethernet popular?

A) uses a familiar technology
B) offers predictable pricing over multi-year periods
C) both A and B
D) neither A nor B

Question 70

In MPLS,the router interface to send the packet back out will be decided ________.

A) during the router's routing process
B) before the first data packet is sent
C) by a dynamic routing protocol
D) none of the above

Question 71

Why is Carrier Ethernet popular?

A) It uses familiar technology.
B) It has attractive prices.
C) both A and B
D) neither A nor B

Question 72

Which spends less processing time on each packet arriving at a router?

A) traditional routing
B) MPLS
C) Both spend about equal time.

Question 73

In MPLS,the label-switched routers in the middle do not look at a packet's IP address.

Question 74

Why is Carrier Ethernet popular?

A) It uses a familiar technology.
B) It is usually easy to upgrade speed rapidly.
C) both A and B
D) neither A nor B

Question 75

WAN optimization devices are deployed ________.

A) at the ends of leased lines
B) by the telephone carrier
C) by the MPLS carrier
D) by the ISP

Question 76

Which reduces traffic more when sending long files?

A) compression
B) caching
C) both A and B
D) neither A nor B

Question 77

Compression reduces traffic by ________.

A) reducing redundancy in the data
B) preventing undesirable traffic from entering the network
C) both A and B
D) neither A nor B

Question 78

Traffic shaping reduces traffic by ________.

A) compression
B) preventing or limiting undesirable traffic from entering the network
C) both A and B

Question 79

In MPLS,the ________ adds the label to the packet.

A) source host
B) first label-switching router
C) either A or B
D) neither A nor B

Question 80

Firms generally pay the added cost of MPLS for connecting their sites ________.

A) because it has higher transmission speeds
B) because it can do traffic engineering
C) because it uses familiar technology
D) all of the above