Deck 10: Wide Area Networks

Question 1

When a phone line is used to carry data traffic,the highest data rate possible is _____.

A)32 kbps
B)1)544 mbps
C)128 kbps
D)64 kbps

Answer 1

D

Question 2

ISDN stands for _____.

A)inter-state data network
B)inter-state digital network
C)improved speed digital network
D)integrated services digital network

Answer 2

D

Question 3

In data communications,a virtual circuit _____.

A)can carry data over various real circuits
B)cannot really carry data
C)is another name for the NASCAR circuit
D)is another name for a circuit

Answer 3

A

Question 4

The statistically multiplexed WAN technology that is specifically designed to carry multiple kinds of traffic data and voice)is _____.

A)frame relay
B)ATM
C)T-3
D)X)25

Question 5

WAN technologies use broadcast.

Question 6

T-1 is the simplest WAN data service provided by telecom carriers.It has a data rate of _____.

A)64 kbps
B)1)544 mbps
C)256 kbps
D)44.736 mbps

Question 7

The earliest wide area data networks were built using _____.

A)phone lines
B)t-carriers
C)ATM
D)X)25

Question 8

T-3 is a very popular WAN data service provided by telecom carriers.Its data rate is _____.

A)64 kbps
B)1)544 mbps
C)44.736 mbps
D)256 kbps

Question 9

Virtual circuit IDs are _____.

A)global
B)shared among neighboring network carriers
C)local to the network carrier
D)None of the above

Question 10

A popular TDM WAN technology is _____.

A)frame relay
B)ATM
C)Synchronous Optical Network SONET)
D)X)25

Question 11

When a device has data to be delivered over a WAN network _____.

A)it waits for the medium to become idle
B)it stops the existing traffic over the medium to send the data
C)the data is merged with the existing traffic
D)None of the above

Question 12

Compared to point-to-point links,statistically multiplexed WANs improve data link utilization by _____.

A)increasing data link capacity
B)increasing the number of data links available
C)increasing the number of end users
D)aggregating traffic

Question 13

The statistically multiplexed WAN technology that uses link-by-link acknowledgments _____.is

A)frame relay
B)T-3
C)ATM
D)X)25

Question 14

Frequency division multiplexed WANs are used to leverage the data carrying capacity of _____.

A)wireless media
B)copper wires
C)SONET
D)optical fiber

Question 15

Wide area networks are defined by their ability to _____.

A)provide data communication services to a large numbers of users
B)provide very high bandwidths
C)provide very high data rates
D)use wireless technologies

Question 16

A virtual circuit ID is assigned to _____.

A)each autonomous system
B)each source-destination pair
C)each source
D)each destination

Question 17

In data communications,the term ATM stands for _____.

A)asynchronous transfer mode
B)automatic teller machine
C)any time money
D)any transfer method

Question 18

The goal of ISDN was to _____.

A)provide all communication services data,voice,video)over one network
B)provide a single bill for all communication services
C)build a network to support data rates up to 10 mbps
D)None of the above

Question 19

Statistically multiplexed WANs are defined by their ability to allocate network resources _____.

A)according to defined time slots
B)according to defined frequencies
C)according to needs
D)on a dedicated basis

Question 20

The limitations of point-to-point technologies include all of the following except _____.

A)they provide very limited opportunities for traffic aggregation
B)they use a relatively simple technology
C)a very large number of links may become necessary when networks grow in size
D)average link utilization can be low

Question 21

ATM specifies data rates in the range of _____.

A)56 kbps - 2 mbps
B)56 kbps - 45 mbps
C)1)544 mbps - 622.08 mbps
D)50.112 mbps - 150.336 mbps

Question 22

Frame relay specifies data rates in the range of _____.

A)1)544 mbps - 622.08 mbps
B)50.112 mbps - 150.336 mbps
C)56 kbps - 2 mbps
D)56 kbps - 45 mbps

Question 23

When traversing from the source to destination,data packets typically cross _____.

A)multiple LANs and multiple WANs
B)multiple LANs and one WAN
C)one LAN and multiple WANs
D)None of the above

Question 24

In the TCP/ IP stack,WAN technologies are considered to be instances of the _____.

A)transport layer
B)data link layer
C)network layer
D)physical layer

Question 25

Virtual circuits are used with _____.

A)point-to-point WANS
B)statistically multiplexed WANs
C)TDM WANs
D)FDM WANs