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Exam 9: Wide Area Networks

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Question 21

Multiple Choice

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A(n) _____ connection transmits at 1.5 Mbps over regular telephone lines.

A) T5
B) Digital Subscriber Line (DSL)
C) analog dial-up line
D) wireless infrared

E) A) and D)
F) C) and D)

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Question 22

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The most popular public switched data network in the world is X.25.

A) True
B) False

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Question 23

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Explain how a network translator (NAT) works.

A special type of wide area network (WAN) is a(n) ____________________, which is limited to a single urban area such as a large city.

Sending data from the network server to the user's computer is called the download .

A wide area network service that is leased from a carrier is managed by that carrier instead of by the user.

A network is considered to be a wide area network (WAN) if it crosses any of the following except _____.

_____ is an optical wireless point-to-point technology that is used to connect remote sites to create a WAN and can transmit at speeds of up to 1.25 Gbps at a distance of 2.5 miles (4 km) .

When a cellular user moves beyond the coverage area of the entire cellular network, the cellular telephone automatically connects with whatever cellular network is in place in the remote area. This is known as roaming .

In the 1980s, ____________________ systems allowed users to post messages and download small programs that other users had posted.

A remote wireless bridge is designed to connect two or more _____ that are located in different buildings.

A wide area network service must often be leased from a(n) _____, which is an organization that has been granted special privileges to build communications connections.

Because of ____________________, a home or business using DSL must be within a certain distance of the carrier's central office, which is usually 3.5 miles (5.5 kilometers).

______________________________ can transmit from 51 to 155 Mbps downstream and 1.54 Mbps upstream using low-powered radio frequency waves that have a range of 2 to 5 miles (3.2-8 km).

A(n) ____________________ converts (modulates) a sending computer's digital signal so it can travel over an analog dial-up phone connection.

_____ refers to a technology that uses wireless high-frequency microwave radio signals to connect to a wide area network (WAN) .

Integrated Services Digital Network (ISDN) is a digital telephone line that can be used for data or voice transmission.

The coverage area for cellular telephones is divided into smaller individual sections called ____________________.

Not only is a license required to install and use free space optics (FSO), but it costs significantly more than installing new fiber optic cables or leasing lines from a local carrier.

A public switched data network (PSDN) is an actual network itself, whereas leased or public data connections are only the connections between networks.