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Information Systems Security > Chapter 2 - Wide Area Networks (WANs) > Flashcards

Chapter 2 - Wide Area Networks (WANs) Flashcards

1
Q

WAN

A

Wide Area Network

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2
Q

Typical WAN data transfer rate

A

1.5 Mbps to 6 Mbps

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3
Q

PSTN

A

Public Switched Telephone Network

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4
Q

ISP

A

Internet Service Provider

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5
Q

How are analog signals measured?

A

In cycles per second, or Hertz.

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6
Q

Hare are digital signals measured?

A

In bits per second (bps)

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7
Q

bps

A

bits per second

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8
Q

CO

A

Central Office

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9
Q

Local Loop

A

The analog portion of voice circuit between the Central Office (CO) and the subscriber.

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10
Q

DSO

A

Digital Signal Level Zero

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11
Q

Digital Signal Level Zero (DSO)

A

The basic level of digital communication upon which all other digital signaling levels are built.

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12
Q

Multiplexing

A

The process of combining several sets of signals onto a high-bandwidth transmission.

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13
Q

Channel

A

A path for communication between two devices.

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14
Q

Broadband

A

A transmission method in which the media bandwidth is allocated to multiple channels and each channel carries a separate signal.

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15
Q

Baseband

A

LAN transmission methods using digital signals at speeds of 2 to 100 Mbps.

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16
Q

Mbps

A

Megabits per second

17
Q

TDM

A

Time Division Multiplexing

18
Q

FDM

A

Frequency Division Multiplexing

19
Q

Two multiplexing technologies in use today:

A

Time Division Multiplexing (TDM), Frequency Division Multiplexing (FDM)

20
Q

DSH

A

Digital Signal Hierarchy

21
Q

Digital Signal Hierarchy (DSH)

A

A hierarchy established in North America to classify the speed capacity of multiplexing lines.

22
Q

What are the 5 Digital Signal Levels of the DSH?

A

DS0, DS1, DS2, DS3, & DS4

23
Q

Circuit switching

A

A technology that uses dedicated physical path to send and receive information.

24
Q

Patch switching

A

A technology that places addressing information into data packets, instead of relying upon a dedicated physical path.

25
Q

Name 4 circuite-switching WAN technologies

A

Plain Old Telephone Service (POTS), T1/E1, T3/E3, & ISDN.

26
Q

PADs

A

Packet assemblers/disassemblers

27
Q

Virtual circuits

A

A path between hosts that appears to be a discrete dedicated connection when in fact it is not. Describes connections between hosts in a packet-switching network.

28
Q

Name 4 packet-switching WAN technologies

A

Digital Subscriber Line (DSL), Cable modem, SONET, & ATM.

29
Q

modem (technical name for it)

A

modulator/demodulator

30
Q

What is a modem?

A

An analog device that enables computers to communicate over telephone lines by translating digital data into audio/analog signals (on the sending computer) and then back into digital form (on the receiving computer).

31
Q

What is the fastest possible speed for data transfer over a standard analog telephone line?

A

56 Kbps (Kilobits pers second)

32
Q

What is the difference between a traditional/analog modem and a modern modem?

A

Analog modems translates analog to digital while modern modems require no translations.

33
Q

IDSN

A

Integrated Services Digital Network

34
Q

What is a B Channel

A

Bearer Channel - 64 Kbps channels used in ISDNs for transmitting voice and data.

35
Q

What is a D Channel

A

Delta Channel - 16 Kbps channel used in ISDNs for signaling and call control.

36
Q

What is an Integrated Services Digital Network (IDSN)?

A

An international standard that defines the transmission of data, voice, and video over digital telephone lines at 64 Kbps. An IDSN line consists of several 64 Kbps channels, which can be combined for faster speeds.

37
Q

What are the 3 IDNS configurations?

A

2B+D (Basic Rate Interface or BRI), 23B+1D (Primary Rate Interface or PRI in the U.S. and Japan), & 30B+2B (Primary Rate Interface or PRI in Europe)

Information Systems Security (1 decks)

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