Deck 10: Carrier Wide Area Networks Wans

Question 1

DSL offers ________.

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

Answer 1

C

Question 2

A LAN is the network that ________.

A)links different sites together
B)provides service within a company
C)provides service within a site
D)all of the above

Answer 2

C

Question 3

LANs are ________.

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

Answer 3

C

Question 4

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 5

The PSTN core is organized as a ________.

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

Question 6

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 7

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 8

LAN speeds are faster than WAN speeds.This is because of ________.

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

Question 9

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 10

Most end-office switches are Class ________ switches.

A)1
B)2
C)3
D)5

Question 11

A company has more control over its ________ technology.

A)LAN
B)WAN

Question 12

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 13

DSL residential service provides ________.

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

Question 14

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

Question 15

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 16

Which of the following usually offers higher speeds?

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

Question 17

The Internet is a ________.

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

Question 18

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 19

WANs are ________.

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

Question 20

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 21

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

Question 22

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 23

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

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

Question 24

Today's dominant cellular technology is ________.

A)LTE
B)3G
C)HSPA+
D)MTSO

Question 25

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 26

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 27

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 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

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 30

Two-way amplifiers are needed for cable ________ service.

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

Question 31

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 32

What speed does the LTE Advanced standard require downstream?

A)3 Mbps
B)30 Mbps
C)3 Gbps
D)30 Gbps

Question 33

The promise of FTTH is ________.

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

Question 34

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 35

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 36

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

Question 37

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 38

Leased lines offer ________ service.

A)fast
B)any-to-any
C)rapid-connection
D)none of the above

Question 39

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 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

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 42

Why is Carrier Ethernet popular?

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

Question 43

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 44

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

Question 45

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 46

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

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

Question 47

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

Question 48

The PSDN technology that is growing rapidly today is ________.

A)Frame Relay
B)Carrier Ethernet
C)the Internet
D)No PSDN technology is growing rapidly today.

Question 49

T1 leased lines run at a speed of about ________.

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

Question 50

Label-switching routers bring ________.

A)lower cost
B)the ability to do traffic engineering
C)quality of service
D)all of the above

Question 51

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

A)POP
B)NAP
C)CSU/DSU
D)interface

Question 52

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

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

Question 53

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 54

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 55

MPLS is ________ the source and destination hosts.

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

Question 56

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

Question 57

In MPLS,the packet travels along the ________.

A)route
B)data link
C)label-switched path
D)MPLS path

Question 58

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

Question 59

A firm uses a PSDN.It has four sites.How many leased lines will it need?

A)0
B)1
C)4
D)none of the above

Question 60

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 61

SDN can ________.

A)permit routing rules to be changed rapidly
B)reduces router costs
C)both A and B
D)neither A nor B

Question 62

The highest layer in SDN consists of ________.

A)switches
B)routers
C)the SDN controller
D)SDN applications

Question 63

Control functions are located in routers in ________.

A)traditional routing
B)SDN
C)both A and B
D)neither A nor B

Question 64

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

Question 65

WAN optimization provides ________.

A)network protocol acceleration
B)caching
C)both A and B
D)neither A nor B

Question 66

SDN ________.

A)reduces CapEx
B)increases OPEx
C)both A and B
D)neither A nor B

Question 67

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

Question 68

Forwarding functions are located in routers in ________.

A)traditional routing
B)SDN
C)both A and B
D)neither A nor B

Question 69

OpenFlow can be used to standardize ________.

A)northbound APIs
B)southbound APIs
C)both A and B
D)neither A nor B

Question 70

Communication between SDN applications and SDN controllers is governed by ________.

A)northbound APIs
B)southbound APIs
C)both A and B
D)neither A nor B

Question 71

The creation of routing tables for a router is an example of ________.

A)forwarding
B)control
C)both A and B
D)neither A nor B

Question 72

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

Question 73

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

Question 74

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