True/False
Indicate whether the sentence or statement is true
or false.
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1.
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A bus
topology WAN is often the best option for organizations with only a few sites and the capability to
use dedicated circuits.
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2.
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When
computers connect via the PSTN, modems are necessary at both the source and destination because not
all of the PSTN is capable of handling digital transmission.
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3.
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PVCs
are dedicated, individual links.
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4.
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T-Carriers belong to the Network layer of the OSI Model.
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5.
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Broadband cable is a symmetrical technology.
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Multiple Choice
Identify the
letter of the choice that best completes the statement or answers the question.
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6.
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A WAN
in which each site is directly connected to no more than two other sites in a serial fashion is known
as a(n) ____. a. | ring topology
WAN | c. | bus topology
WAN | b. | mesh topology
WAN | d. | star topology
WAN | | | | |
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7.
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A(n)
____ connection is one in which a user connects, via a modem, to a distant network from a
computer and stays connected for a finite period of time. a. | T3 | c. | T1 | b. | dial up | d. | broadband | | | | |
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8.
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____
is an analog, packet-switched technology designed for long-distance data transmission and
standardized by the ITU in the mid-1970s. a. | X.25 | c. | E1 | b. | T-Carrier | d. | 802.16 | | | | |
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9.
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____
are connections that are established before data needs to be transmitted and maintained after the
transmission is complete. a. | Frame Relays | c. | CSUs | b. | HFCs | d. | PVCs | | | | |
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10.
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A(n)
____ lease allows organizations to use only some of the channels on a T1 line and be charged
according to the number of channels they use. a. | partial T1 | c. | fractional T1 | b. | frame
relay | d. | basic
T1 | | | | |
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11.
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____
is a WAN connection method introduced by researchers at Bell Laboratories in the
mid-1990s.
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12.
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A(n)
DSL ____ is a device that modulates outgoing signals and demodulates incoming DSL
signals. a. | modem | c. | connector | b. | adapter | d. | PSTN | | | | |
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13.
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Places where wireless Internet access is available to the public are called
____. a. | hubs | c. | local
loops | b. | access points | d. | hot spots | | | | |
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14.
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____
means that satellites orbit the earth at the same rate as the earth turns. a. | Satellite
return | c. | Geosynchronous
orbit | b. | DSLAM | d. | NSP orbit | | | | |
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15.
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A(n)
____ is the creation of a communications channel for a transmission from an earth-based transmitter
to an orbiting satellite. a. | downlink | c. | LEO | b. | uplink | d. | MEO | | | | |
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16.
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____
is Microsoft’s remote access software available with the Windows Server 2003 network operating
system and the Windows XP client operating systems.
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17.
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Which
of the following protocols enable a workstation to connect to another computer using a serial
connection?
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18.
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____
refers to a communications method in which nodes do not have to conform to any predetermined schemes
that specify the timing of data transmissions. a. | Symmetrical | c. | Asynchronous | b. | Synchronous | d. | Asymmetrical | | | | |
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19.
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____
are wide area networks logically defined over public transmission systems. a. | VPNs | c. | Transponders | b. | Hot spots | d. | Web portals | | | | |
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20.
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To
make sure a VPN can carry all types of data in a private manner over any kind of connection, special
VPN protocols encapsulate higher-layer protocols in a process known as ____. a. | bonding | c. | low earth
orbiting | b. | routing | d. | tunneling | | | | |
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21.
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____,
a standard accepted and used by multiple different vendors, can connect VPNs that use a mix of
equipment types.
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22.
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A(n)
____ topology WAN incorporates many directly interconnected sites. a. | star | c. | tiered | b. | mesh | d. | ring | | | | |
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23.
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____
are connections that are established when parties need to transmit, then terminated after the
transmission is complete. a. | Hot spots | c. | Frame Relays | b. | SVCs | d. | CSUs | | | | |
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24.
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A(n)
____ circuit can carry the equivalent of 672 voice or data channels, giving a maximum data throughput
of 44.736 Mbps.
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25.
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The
speed of a T-carrier depends on its ____. a. | frame relay | c. | last mile | b. | signal
level | d. | local
loop | | | | |
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26.
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HDSL,
SDSL, and SHDSL are examples of ____. a. | symmetrical DSL | c. | PSTN | b. | L2TP | d. | asymmetrical DSL | | | | |
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