Quiz #17: DSL

By Whatis.com 26 Feb 2002 | SearchWebServices.com

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1.) This is the protocol used to "gather" DSL traffic from users and forward it to a Digital Subscriber Line Access Multiplexer, which consolidates traffic across the backbone network.
a. Forward DNS lookup
b. Transmission Control Protocol
c. asynchronous transfer mode
d. Accelerated Hub Architecture

2.) This form of DSL uses most of the channel to transmit downstream to the user and only a small part to receive information from the user.
a. VoIP
b. Asymmetric Digital Subscriber Line
c. ISDN
d. cable modem

3.) This trademarked version of DSL that is somewhat slower than ADSL but has the advantage that a "splitter" does not need to be installed at the user's end.
a. unified messaging
b. Consumer DSL
c. G.lite
d. Netcaster

4.) This device divides the incoming signal into low frequencies to send to voice devices, and high frequencies for data to the computer.
a. multicast router
b. interface device
c. sequencer
d. splitter

5.) This is a network device, usually at a telephone company central office, that receives signals from multiple customer DSL connections and puts the signals on a high-speed backbone line.
a. MBone
b. repeater
c. hub
d. DSLAM

6.) This is the leading method of signal modulation for DSL service in which the usable frequency range is separated into 256 frequency bands (or channels) of 4.3125KHz each.
a. pulse code modulation
b. discrete multitone
c. frequency-division multiplexing
d. Signaling System 7

7.) This is a technology from US Robotics (now 3Com) for the downstream transmission of data over ordinary phone lines at 56 Kbps.
a. Y-modem
b. xDSL
c. Z-modem
d. x2

8.) This term is used to describe multiple signals or streams of information sent at the same time in the form of a single, complex signal and then recovered as separate signals at the receiving end.
a. multicast
b. multilink bundle
c. multiplexing
d. multithreading

9.) This type of DSL is used for wideband digital transmission within a corporate site and between the telephone company and a customer. It is symmetrical, meaning that an equal amount of bandwidth is available in both directions.
a. BAL
b. High bit-rate DSL
c. vBNS
d. wideband code-division multiple access

10.) This was the original approach for modulation of a Digital Subscriber Line (DSL) signal.
a. carrierless amplitude/phase
b. pulse code modulation
c. quadrature amplitude modulation
d. phase-shift keying

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Be sure to take:

Quiz #1: Help Desk Basics
Quiz #2: Security Basics
Quiz #3: Data Storage
Quiz #4: Networking Hardware
Quiz #5: Getting Your Message Across the Network
Quiz #6: Servers
Quiz #7: Protocols
Quiz #8: Database Basics
Quiz #9: Wireless
Quiz #10: TCP/IP
Quiz #11: Ego-Booster
Quiz #12: Database II
Quiz #13: AS/400
Quiz #14: Peripherals
Quiz #15: HP
Quiz #16: Web Management Basics
Quiz #17: DSL (you're on this quiz now)

ANSWER KEY: 1c - 2b - 3b - 4d - 5d - 6b - 7d - 8c - 9b - 10a

Learn more about Digital Subscriber Line (DSL) with our Fast Guide to DSL

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