Deck 9: Wide Area Networks

Question 1

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

Answer 1

True

Question 2

Local Multipoint Distribution Service (LMDS) can transmit at longer distances than Multichannel Multipoint Distribution Service (MMDS).

Answer 2

False

Question 3

Free space optics (FSO) transmissions are sent by high-powered infrared (IR) beams through the open air.

Answer 3

False

Question 4

The top speed at which data can be sent over an analog dial-up connection is about _____.

A) 1.5 Mbps
B) 56 Kbps
C) 150 Kbps
D) 640 Mbps

Question 5

Each is a difference between a local area network and a wide area network except _____.

A) number of devices
B) geography
C) ownership
D) speed

Question 6

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

Question 7

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 .

Question 8

It is not possible to carry on a conversation over the same telephone line while transmitting data using digital subscriber line (DSL) technology.

Question 9

Frame Relay is unique in that it can support data, voice, and video all on one network.

Question 10

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

A) lake
B) railroad
C) highway
D) parking lot

Question 11

All local area networks operate at lower speeds that wide area networks.

Question 12

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

Question 13

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

Question 14

The cost for setting up and using a virtual private network (VPN) is very high in comparison to using trunk-based leased lines.

Question 15

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.

A) vendor
B) carrier
C) entity
D) government

Question 16

Circuit switching of telephone calls is done through a device called a switch , which is located at the telephone company's central office.

Question 17

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.

Question 18

A virtual private network (VPN) uses the public Internet to transmit data.

Question 19

A wide area network instead of a local area network is used for each reason except _____.

A) to link two or more remote sites together
B) to save files
C) for an individual employee to access business data from a remote location
D) for a user to access the Internet

Question 20

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

Question 21

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

A) T-56
B) Cable frequency connection (CFC)
C) Wireless local area network (WLAN)
D) Multipoint distribution services (MDS)

Question 22

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

Question 23

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

Question 24

Each is a characteristic of Multichannel Multipoint Distribution Service (MMDS) except _____.

A) very susceptible to interference from rain and fog
B) uses low-frequency signals
C) better able to penetrate buildings
D) has a range of up to 35 miles

Question 25

Digital cellular telephony today is called 2.5G, and these networks operate at a maximum speed of _____.

A) 56 Kbps
B) 10 Gbps
C) 384 Kbps
D) 100 Mbps

Question 26

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

Question 27

Sending and receiving transmissions at different speeds over a wide area network is known as _____ transmission.

A) asymmetric
B) symmetric
C) upload
D) Variable Transmission Bit (VTB)

Question 28

A drawback to cable modems is that _____.

A) they only transmit at 56 Kbps
B) the connection is shared among all users in the neighborhood
C) they require a telephone line
D) the computer must be within 1 mile of the head in

Question 29

When a cellular telephone user moves toward the next cell, the cellular telephone automatically associates with the transmitter of that cell. This is known as _____.

A) roaming
B) association
C) transfer
D) handoff

Question 30

Leased data connections have all of these features except _____.

A) they are permanent
B) the lines are dedicated between the sites
C) they are faster than wired analog and digital cellular
D) the minimum lease is 36 months

Question 31

The average speed for a cable modem is between 300 Kbps and _____.

A) 310 Kbps
B) 640 Kbps
C) 10 Gbps
D) 1.5 Mbps

Question 32

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

Question 33

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

A) devices
B) LANs
C) WANs
D) MANs

Question 34

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

Question 35

Although ___________________ is technically defined as "the transmission of voice or other sounds by means of electrical signals sent over wires or radio waves," it is usually considered the same as the telephone system.

Question 36

Low earth orbiting (LEO) and _____ satellites are typically used for WAN data connections.

A) high earth orbiting (HEO)
B) medium earth orbiting (MEO)
C) oceanic orbiting (OO)
D) polar orbiting (PO)

Question 37

Each is a type of digital subscriber line (DSL) service except _____.

A) slow-speed DSL (SSDSL)
B) asymmetric DSL (ADSL)
C) high-rate DSL (HDSL)
D) HDSL2

Question 38

_____ 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).

A) Global distribution system
B) Long-range wired cable
C) Low orbiting satellite
D) Free space optics

Question 39

_____ switching permits an "always-on" connection so that the user does not have to dial the wide area network whenever a connection is needed.

A) Circuit
B) 2G
C) Full
D) Packet

Question 40

The trunk-based leased line _____ runs over twisted pair copper wires at a speed of 1.5 Mbps.

A) T1
B) T2
C) T3
D) T4

Question 41

List and describe the three types of firewalls.

Question 42

At the carrier's central office, all of the digital subscriber lines (DSL) connect into a(n) ____________________, which in turn connects to the WAN.

Question 43

Explain how Digital Subscriber Lines (DSL) can send transmissions up to 1.5 Mbps while a standard dial-up line can only send at 56 Kbps.

Question 44

Define identity theft and how it can be prevented.

Question 45

A(n)____________________ transmits at the higher unused frequencies of an analog telephone line.

Question 46

List and describe 5 differences between a local area network and a wide area network.

Question 47

Explain how a network translator (NAT) works.

Question 48

Because they orbit so close to the earth, ____________________ satellites must travel at high speeds so the earth's gravity does not pull them back into the atmosphere.

Question 49

______________________________ 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).

Question 50

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).