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NETW-106 TEST 2 (4/4/13) > Lesson 8: WAN Technologies > Flashcards

Lesson 8: WAN Technologies Flashcards

1
Q

One of the most common forms of high-speed DSL found today that provides a different data throughput for upstream communications than it does for downstream communications.

A

Asymmetric Digital Subscriber Line (ADSL)

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2
Q

A signal multiplexing technique that uses time slots to split a communications signal into different channels. Unlike standard time division multiplexing, the _____ variant only splits the signal into the number of channels being used in any given time slot, rather than into all channels, regardless of whether they are in use or not.

A

Asynchronous Time Division Multiplexing

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3
Q

A switching technique for telecom networks that uses asynchronous timedivision multiplexing to break up communications into small frame-like segments or cells.

A

Asynchronous Transfer Mode (ATM)

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4
Q

A type of communications technology that can carry multiple signals simultaneously. See baseband.

A

Broadband

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5
Q

Small, uniformly-sized packets that Asynchronous Transfer Mode (ATM) and other WAN technologies use to carry data across a network.

A

Cell

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6
Q

A communications technology that establishes a dedicated communications channel for the duration of a given transmission.

A

Circuit Switching

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7
Q

Telecommunications equipment that the customer is responsible for providing when leasing a WAN connection. Some examples would be the CSU/ DSU for T-1 and Frame Relay connections and the Network Termination equipment for ISDN connections.

A

Customer Premise Equipment (CPE)

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8
Q

Short for demarcation point, the last point of responsibility for a WAN service provider within a local network infrastructure.

A

Demarc

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9
Q

The point in which the Public Switched Telephone Network (PSTN) service provider comes into a local home or business. Also called demarc for short.

A

Demarcation Point

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10
Q

A type of multiplexing that uses wavelength to place more data on a cable rather than time segments.

A

Dense Wavelength Division Multiplexing (DWDM)

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11
Q

One of the oldest wide area network communication technologies available that uses a device called a modem to connect a computer via a plain old telephone service (POTS).

A

Dial-up

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12
Q

A type of data communications technology that uses the Public Switched Telephone Network (PSTN), except that it transfers data in digital and at a higher frequency than voice communications do.

A

Digital Subscriber Line (DSL)

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13
Q

A line that can carry a total throughput of 2.048mbps and has 31 channels of 64kbps. and is the European counterpart to T1 lines in the United States.

A

E-1

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14
Q

A line can carry a total throughput of 34.386mbps and has 512 channels of 64kbps. and is the European counterpart to T-3 lines in the United States.

A

E-3

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15
Q

A T1 connection that is divided up into 24 channels of 64kbps each.

A

Fractional T-1

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16
Q

A WAN service designed to connect two points that require only intermittent communication.

A

Frame Relay

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17
Q

A fixed position above the Earth for seeing the largest area on the planer at one time, located 35,786 kilometers up and along the Earth’s equator. This orbit is also sometimes called Geosynchronous orbit (GEO).

A

Geostationary Orbit (GSO)/Geosynchronous Orbit (GEO)

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18
Q

A type of DSL developed to use twisted-pair copper lines and to carry both voice and data.

A

High-Bit-Rate Digital Subscriber Line (HDSL)

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19
Q

A set of standards designed to carry voice, video, data, and other services in a digital format over the Public Switched Telephone Network (PSTN).

A

Integrated Services Digital Network (ISDN)

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20
Q

An entry-level version of ISDN, and the most commonly used version, which is able to achieve both upstream and downstream data rates by bonding two 64 kbps channels, called B channels, together for data transmission and a third smaller channel of 16 kbps, called the D channel, for control information.

A

Integrated Services Digital Network-Basic Rate Interface (ISDN-BRI)

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21
Q

A version of ISDN similar to ISDN-BRI except that instead of just two B channels bonded together, it has 23 (in North America) or 30 (in Europe) . Additionally, the D channel for ISDNPRI has a throughput of 64 kbps instead of 16 kbps.

A

Integrated Services Digital Network-Primary Rate Interface (ISDN-PRI)

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22
Q

The telecommunications link from the customer’s demarc point to the first remote switching facility. This telecommunications link can be much less than a mile in urban areas and much more than a mile in rural areas.

A

Last Mile

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23
Q

A dedicated digital communications link, such as a T-1, permanently set up between two points, providing the subscriber with a constant level of bandwidth at all times.

A

Leased Line

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24
Q

The loop that encompasses the customer’s demarcation point and the customer’s central office.

A

Local Loop

25
Q

A type of satellite orbit commonly used for handheld satellite communications and generally considered to be any orbit between 160 kilometers and 2,000 kilometers.

A

Low Earth Orbit (LEO)

26
Q

A type of orbit between 2,000 and 34,780 kilometers, primarily used for GPS networks.

A

Medium Earth Orbit (MEO)

27
Q

A data communications technology in which whole messages are routed to their destinations one hop at a time.

A

Message Switching

28
Q

A type of orbit between 200 and 1,000 kilometers, designed to cover locations in far northern regions of the Earth.

A

Molniya Orbit

29
Q

A relatively new standard designed to speed up data transmission across a larger network by attaching labels to frames based on their destination rather than their source so that multiple frames going to the same destination can be grouped together.

A

Multiprotocol Label Switching (MPLS)

30
Q

An ISDN device that converts the 4-wire subscriber line to the conventional 2-wire service entering most homes.

A

Network Termination

31
Q

An optic carrier level in which the X is the actual multiple of the base level called OC-l.This measurement is used in reference to SONET networks.

A

OC-x

32
Q

A network communications technology that opens up connections only long enough for a small data packet to move from one network segment to another.

A

Packet Switching

33
Q

A point-to-multipoint fiber optics network.

A

Passive Optical Network (PON)

34
Q

The standard land-line telephone service that almost every household in America has access to.

A

Plain Old Telephone Service (POTS)

35
Q

A telephone exchange or switch that serves a private business or office rather than one a phone company owns.

A

Private Branch Exchange (PBX)

36
Q

A network that is not intended to connect directly to the Internet, bur uses an intermediary such as Network Address Translation (NAT) tov allow access to the Internet.

A

Private Network

37
Q

A network that is intended to have direct access to the Internet.

A

Public Network

38
Q

The entire world-wide telephone network.

A

Public Switched Telephone Network (PSTN)

39
Q

The ability to gain entry to a computer via a WAN connection.

A

Remote Access

40
Q

A group of technologies used to facilitate remote access to a computer network.

A

Remote Access Services (RAS)

41
Q

The most widely known type ofVPN, used to connect remote users to a corporate network via a public network, usually the Internet.

A

Remote Access VPN

42
Q

A variation on microwave communications in which a ground station communicates to one or more orbiting satellites, and then the satellites communicate to a different ground station or to another orbiting satellite.

A

Satellite Communications

43
Q

A feature of PPP that conserves bandwidth by compressing a data stream before transmitting it.

A

Server-Side Compression

44
Q

A type of virtual private networking that connects different company-owned sires to each other via a public network such as the Internet without using dedicated leased lines such as a T-1.

A

Site-to-Site VPN

45
Q

A type of DSL technology that offers the same data rates for both downstream and upstream communications.

A

Symmetric Digital Subscriber Line (SDSL)

46
Q

A multiplexing protocol that transfers multiple digital bit streams, also called channels, over fiber-optic cables using either lasers or LEDs. SDH is similar to the SONET technology used United States and Canada.

A

Synchronous Digital Hierarchy (SDH)

47
Q

A standardized multiplexing protocol used to transfer multiple digital bit streams, also called channels, over fiber-optic cables.

A

Synchronous Optical Network (SONET)

48
Q

A telecommunication technology that can carry a total of 1 ,544mbps and has 24 channels of 64kbps.The European equivalent to this technology is El.

A

T-1

49
Q

A telecommunication technology that can carry a total of 44.736mbps and has 672 channels of 64kbps.The European equivalent to this technology is E3.

A

T-3

50
Q

A group of technologies that uses digital multiplexing to create a number of smaller 64 kbps channels which administrators can combine or separate as needed.

A

T-Lines

51
Q

The phone, computer, or other device that is connected to the ISDN network.

A

Terminal Equipment

52
Q

A signal multiplexing technique that uses time slots to break a communications signal into a set number of channels.

A

Time Division Multiplexing

53
Q

A compression standard that attempts to work around the speed limitations for dial-up by compressing data by a factor of 6.

A

V.44

54
Q

A version of DSL that can provide very high data-transfer rates. Sometimes seen as VHDSL.

A

Very-High-Bit-Rate Digital Subscriber Line (VDSL)

55
Q

A technology that combines the efficiency of circuit switching with the flexibility allowed by packet switching.

A

Virtual Circuit Switching

56
Q

A technology used to establish a connection from a client computer outside a local nerwork to an enterprise LAN using the Internet or other public nerwork. ___ is commonly used by corporations to allow their users to gain remote access to their corporate servers.

A

Virtual Private Network (VPN)

57
Q

_____ is a wireless communications standard that uses microwaves as the communications media of choice.

A

Worldwide lnteroperability for Microwave Access (WiMAX)

58
Q

A technology developed in rhe 1970s as a means ro use packet-switched communications in a WAN environment.

A

X.25

NETW-106 TEST 2 (4/4/13) (4 decks)

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