Question: When a phone line is used to carry data traffic, the highest data rate possible is

Answer Options:

32 kbps
128 kbps
64 kbps
1.544 mbps

Answer: 1.544 mbps

 

Question: The earliest wide area data networks were built using

Answer Options:

X.25
ATM
T-carriers
Phone lines

Answer: Phone lines

 

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

Answer Options:

64 kbps
1.544 mbps
2.56 kbps
44.736 mbps

Answer: 1.544 mbps

 

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

Answer Options:

64 kbps
1.544 mbps
2.56 kbps
44.736 mbps

Answer: 44.736 mbps

 

Question: ISDN stands for

Answer Options:

Inter-state data network
Improved speed digital networks
Integrated services digital network
Inter-state digital network

Answer: Integrated services digital network

 

Question: The phone network offers a

Answer Options:

FDM WAN service
None of the above
Point-to-point network service
Statistically multiplexed network service

Answer: Point-to-point network service

 

Question: The limitations of point-to-point technologies include all of the following except

Answer Options:

Average link utilization can be low
They can be set up easily with phone lines using modems
A very large number of links may become necessary when networks grow in size
They provide very limited opportunities for traffic aggregation

Answer: They can be set up easily with phone lines using modems

 

Question: Statistically multiplexed WANs are defined by their ability to allocate network resources

Answer Options:

On a dedicated basis
According to defined frequencies
According to needs
According to defined time slots

Answer: According to needs

 

Question: Compared to point-to-point links, statistically multiplexed WANs improve data link utilization by

Answer Options:

Increasing the number of data intermediates
Increasing the number of end users
Aggregating traffic
Increasing data link capacity

Answer: Aggregating traffic

 

Question: In data communications, a virtual circuit

Answer Options:

Cannot really carry data
Is another name for the NASCAR circuit
Is another name for a circuit
Can carry data over various real circuits

Answer: Can carry data over various real circuits

 

Question: A virtual circuit ID is assigned to

Answer Options:

Each source-destination pair
Each destination
Each source
Each autonomous system

Answer: Each source-destination pair

 

Question: Wide area networks are defined by their ability to

Answer Options:

Operate over high bandwidths
Provide very high data rates
Provide data communication services to large numbers of users
Operate over large distances

Answer: Operate over large distances

 

Question: WAN technologies use broadcast

Answer Options:

True
False

Answer: False

 

Question: When a device has data to be delivered over a WAN network

Answer Options:

It stops the existing traffic over the medium to send the data
The data is merged with the existing traffic
None of the above
It waits for the medium to become idle

Answer: The data is merged with the existing traffic

 

Question: When a phone line is used to carry data traffic, the highest data rate possible is

Answer Options:

32 kbps
128 kbps
64 kbps
1.544 mbps

Answer: 1.544 mbps

 

Question: The earliest wide area data networks were built using

Answer Options:

X.25
ATM
T-carriers
Phone lines

Answer: Phone lines

 

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

Answer Options:

64 kbps
1.544 mbps
2.56 kbps
44.736 mbps

Answer: 1.544 mbps