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 terminals
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: Virtual circuit IDs are

Answer Options:

None of the above
Shared among neighboring network carriers
Global
Local to the network carrier

Answer: Local to the network carrier

 

Question: The statistically multiplexed WAN technology that uses link-by-link acknowledgments is

Answer Options:

X.25
T-3
ATM
Frame relay

Answer: X.25

 

Question: In data communications, the term ATM stands for

Answer Options:

Any time money
Any transfer method
Asynchronous transfer mode
Automatic teller machine

Answer: Asynchronous transfer mode

 

Question: The statistically multiplexed WAN technology that is specifically designed to carry multiple kinds of traffic (data and voice) is

Answer Options:

X.25
Frame relay
T-3
ATM

Answer: ATM

 

Question: A popular TDM WAN technology is

Answer Options:

Frame relay
Synchronous Optical Network (SONET)
ATM
X.25

Answer: Synchronous Optical Network (SONET)

 

Question: Frequency division multiplexed WANs are used to leverage the data carrying capacity of

Answer Options:

Wi-fi
Copper wires
PCs
Optical fiber

Answer: Optical fiber

 

Question: When traversing from the source to destination, data packets typically cross

Answer Options:

Multiple LANs and one WAN
Multiple LANs and multiple WANs
One LAN and multiple WANs
None of the above

Answer: Multiple LANs and multiple WANs

 

Question: In the TCP/IP stack, WAN technologies are considered to be instances of the

Answer Options:

Transport layer
Network layer
Physical layer
Data link layer

Answer: Data link layer

 

Question: ATM specifies data rates in the range of

Answer Options:

56 kbps – 45 mbps
56 kbps – 2 mbps
50.112 mbps – 150.336 mbps
1.544 mbps – 622.08 mbps

Answer: 1.544 mbps – 622.08 mbps