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DATA COMMS > Part 5 > Flashcards

Part 5 Flashcards

1
Q

It is a baseband transmission system designed in 1972 by Robert Metcalfe and David Boggs.
It refers to the family of LAN products covered by IEEE 802.3 standard that defines what is commonly known as CSMA/CD (carrier sensed multiple access with collision detection).

A

The Ethernet

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2
Q

Is the result to the loss of data that occurs when two stations transmit at the same time on a network.

A

Collision

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3
Q

Is a very popular system for defining and switching data packets on computer networks.

A

X.25 protocol

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4
Q

________ defines how packet-mode terminal can be connected to a packet network or PDN for the exchange of data, and also defines how the user’s DTE communicates.

A

X.25

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5
Q

It is a WAN technology with higher data rate at lower cost, however, it has bursty data and bandwidth on demand.

A

Frame Relay

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6
Q

________ has a transmission rate of ________ and it specifies three (3) layers:
*Packet Layer - Network Layer
*Frame Layer - Data Link Layer
*Physical Layer - Physical (X.21)

A

X.25, 1.544 Mbps

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7
Q

Is a connection between two or more terminals without physical connections.

A

Virtual circuit

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8
Q

Frame Relay data rate can be up to

A

44.376 Mbps

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9
Q

It is a high-performance, cell-oriented switching and multiplexing technology that utilizes fixed-length packets to carry different types of traffic.

A

Asynchronous Transfer Mode (ATM)

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10
Q

It uses the cell (small fixed-sized block of information) as the basic unit of data exchange, and it is a 53-byte cell with 5 bytes header and 48 bytes as the payload.

A

Asynchronous Transfer Mode (ATM

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11
Q
  • it accepts transmission from upper-layer services and maps them into ATM cells.
  • it provides routing, traffic management, switching and multiplexing.
  • it defines the transmission medium, bit transmission, encoding and electrical-to-optical transformation.
A

Application Adaptation Layer
ATM Layer
Physical Layer

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12
Q

It is a set of protocols that combines digital telephony and data transport services.
It incorporates all communications connection in a home or building into a simple interface

A

Integrated Services Digital Network (ISDN)

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13
Q

It is the basic user channel and operates at 64 kbps. It serves one of the following traffic: voice, data, slow-scan TV, and facsimile.

A

Bearer (B) Channel

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14
Q

It is a 16 kbps channel primarily used for signaling. It is a 64 kbps channel when used for primary service.

A

Data (D) Channel

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15
Q

It does not carry signaling. Its purpose is to serve higher data rates (H0 channel -384 kbps, H11 channel-1536 kbps, H12 channel - 1920 kbps).

A

Hybrid (H) Channel

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16
Q

Basic Rate Interface (BRI)

A

2B+D and has a transmission rate of 192 kbps. (B = 64 kbps, D = 16 kbps).

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17
Q

Primary Rate Interface (PRI)

A

23B+D (North America) and has a transmission rate of 1.544 Mbps or 30B+D (Europe) and has a transmission rate of 2.048 Mbps. (B= 64 kbps, D = 64 kbps).

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18
Q

It is defined by ITU-T as a service that provides transmission channels capable of supporting transmission rates greater than the primary data rate.

A

Broadband ISDN

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19
Q

With the introduction of BISDN, the original concept of ISDN is being referred to as

A

Narrowband ISDN

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20
Q

Is a form of wide area network (WAN) which supplies network connectivity over a possibly long distance.

A

VPN (virtual private network)

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21
Q

WLAN is an IEEE 802.11 standard designed as wireless Ethernet and are commonly referred to by their trade name

A

Wi-Fi (wireless fidelity)

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22
Q

It is a de facto standard and specification for small-form, low- cost, short range radio links between mobile PCs, mobile phones, and other portable devices
It operates in the ISM (international scientific and medical) band.

A

Bluetooth

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23
Q

Is built into a small microchip and operates in the 2.4 GHz band, using 79 channels between 2.402 GHz to 2.480 GHz (23 channels in some countries).

A

Bluetooth

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24
Q

It uses FHSS (frequency hopping spread spectrum), which changes its signal 1600 times per second, which helps avoids interception by unauthorized parties.

A

Bluetooth

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25
Q

It supports both point-to-point and point-to-multipoint connections and provides up to 72 kbps data transfer within a range of 10 meters (up to 100 meters with a power boost).

A

Bluetooth

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26
Q

Connection of devices (slaves and master) is called ______ in which up to seven devices can be set to communicate with a master radio in one device; ________ is formed when several piconets are linked together which allows communication between other device configurations.

A

piconets, scatternet

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27
Q

It is used in industry for next generation automated manufacturing, with small transmitters in every device on the floor, allowing for communication between devices to a central computer

A

Zigbee

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28
Q

It supports PMP (point-to-multipoint) broadband wireless access, allows higher data rates over longer distances, efficient use of bandwidth, and avoids interference almost to a minimum.

A

WIMAX

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29
Q

WIMAX

A

Worldwide Interoperability for Microwave Access (IEEE 802.16 )

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30
Q

A short-range infrared system called ________ has been used for some time to allow two devices to communicate with each other.
The system is deliberately restricted to a range of one (1) meter, and there must be a clear line- of-sight between transmitter and receiver.

A

IRDA (infrared data association) - Infrared PAN

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31
Q

This technology uses thin, inexpensive tags or labels containing passive radio circuits that can be queried by a remote wireless interrogation unit

A

Radio-Frequency Identification (RFID)

32
Q

Wireless version of bar codes

A

Radio-Frequency Identification (RFID)

33
Q

One of the newest forms of wireless is a version of RFID.
It is an ultrashort-range wireless whose range is rarely more than a few inches.

A

NFC (near field communications)

34
Q

It is a technology used in smart cards and cell phones to pay for purchases or gain admittance to some facilities.

A

NFC (near field communications).

35
Q

The newest and most unusual form of wireless technology. It can be used indoors and underground, unlike GPS, because of it spans the entire frequency spectrum.

A

UWB (ultra wideband) technology

36
Q

Both _______ and ________ are movements that seek to connect devices to one another or connect devices to humans wirelessly.

A

M2M (machine-to-machine), IoT (internet of things)

37
Q

The uses of _______ include transportation, energy, industrial, sales and payment, security, and healthcare.

A

M2M

38
Q

The _______ is like M2M but with a broader scope of applications; it is more oriented to consumer and general commercial applications. It assumes that each “thing” has an IP address; it can be almost anything.

A

IoT

39
Q

Many wide-area networks, especially the Internet, are based on these two protocols

A

TCP (transmission control protocol) and IP (internet protocol)

40
Q

It was developed by the US Department of Defense before the inception of the seven-layer OSI model.

A

TCP/IP

41
Q

It is a suite of protocols that allows a wide variety of computers to share the same network, and it forms a hierarchical much like the OSI system

A

TCP/IP

42
Q

The _______ seven-layer model specifies exactly which function each layer performs, whereas the _____ is comprised of several relatively independent protocols that can be combined in many ways, depending on system needs.

A

OSI, TCP/IP

43
Q

It is a network layer protocol which provides for the transfer of a basic unit of information known as datagram.

A

Internet Protocol (IP)

44
Q

It provides connectionless service, meaning that there is no call set-up phase prior to exchange of traffic.
It has no flow control nor error control capabilities incorporated.

A

Internet Protocol (IP)

45
Q

It is a transport layer connection-oriented protocol which is responsible for providing reliable communications between hosts and processes on different hosts.

A

Transmission Control Protocol (TCP)

46
Q

It is perhaps the most popular TCP/IP application that is used to convey information between a web browser and a web server.

A

HyperText Transmission Protocol (HTTP)

47
Q

The file viewed in web terminology is known as a ______. The first page displayed when a browser access the top-level file on a web server is known as a ________.

A

page, home page

48
Q

It was developed as a mechanism facilitate the transfer of files between computers.

A

File Transfer Protocol (FTP)

49
Q

Its key advantage is that it is platform independent, enabling the transfer of files between different types of computers.

A

File Transfer Protocol (FTP)

50
Q

Networks are increasingly being connected together to form very large communications systems and the largest of these is the ______ which is worldwide in scope.

A

Internet

51
Q

Is a worldwide public network of networks that connects a very wide variety of computers, applications, and users.

A

Internet

52
Q

It is funded by the DARPA (Defense Advanced Research Projects Agency), and is the predecessor of Internet

A

ARPANET

53
Q

The work involved in establishing the ARPANET resulted in the development of two specific protocols for the transmission of information. These protocols are?

A

Transmission Control Protocol and the Internet Protocol, commonly known collectively as TCP/IP.

54
Q

The routing of information on the Internet as well as the other public and private networks is based on

A

IP addressing

55
Q

The network portion of the address is assigned by the

A

InterNIC (internet network information center)

56
Q

It is a 128-bit address

A

IPv6 Address

57
Q

It is a 32-bit address

A

IPv4 Address

58
Q

It provides the largest range of addresses available for assignment to host computers.

A

Class A Address

59
Q

It is restricted to a network number from 1 to 127 for its first decimal number.

A

Class A Address

60
Q

It is evenly split using two (2) bytes for the network portion and two (2) bytes for the host portion of the address. The availability of two (2) bytes for host computer address assignments enables up 65634 hosts to be identified.

A

Class B Address

61
Q

It is restricted to a network number from 128 to 191 for its first decimal number.

A

Class B Address

62
Q

It uses three (3) bytes for the network portion and one (1) byte for host identification. It is restricted to supporting a maximum of 254 hosts.

A

Class C Address

63
Q

It is restricted to a network number from 192 to 223 for its first decimal number.

A

Class C Address

64
Q

Splitting a network into smaller networks

A

Subnetting

65
Q

The first IP address

A

Network Address

66
Q

The last IP address

A

Broadcast Address

67
Q

The translation process, which is transparent to a user, occurs through the use of TCP/IP application known as

A

DNS (domain name service)

68
Q

Is a public data communications network used by millions of people all over the world to exchange business and personal information.

A

Internet

69
Q

Is a private network that use the same TCP/IP protocol suite as the Internet and are often connected to it

A

Intranet

70
Q

Is software to prevent unauthorized access to computers on a network by computers outside the network.

A

Firewall

71
Q

Is a general term for the Internet.

A

Cloud

72
Q

Is the process of storing and accessing programs or data over the Internet.

A

Cloud computing

73
Q

Is a company set up especially to tap into the Internet.

A

ISP (internet service provider)

74
Q

Is a collection of companies that install, service, and maintain large nationwide and even worldwide networks of high-speed optical fiber cable.

A

Internet backbone

75
Q

2B+D transmission rate

A

192 kbps (B = 64 kbps, D = 16 kbps)

76
Q

23B+D (North America) transmission rate

A

1.544 Mbps (B= 64 kbps, D = 64 kbps)

77
Q

30B+D (Europe) transmission rate

A

2.048 Mbps (B= 64 kbps, D = 64 kbps).

DATA COMMS (6 decks)

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