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CMSC 205 Data Communications and Networking > Module 1 - Introduction to Data Communications and Networks > Flashcards

Module 1 - Introduction to Data Communications and Networks Flashcards

1
Q

Data Communications

A

process of transferring digital information between two or more points.

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2
Q

Information

A

knowledge, idea, concept

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3
Q

Data

A

processed information

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4
Q

Computer Network

A

interconnected set of independent computers

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5
Q

Not Networks

A
  1. Master/slave computers

2. Computer with dumb terminals and printers

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6
Q

Benefits of Data Communication and Networking

A
  1. Speed
  2. Convenience
  3. Cost Reduction / Resource Sharing (printers, disk drives)
  4. Network can become communication medium: ex: www / videoconferencing
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7
Q

Topologies for Network Hardware Devices

A
  1. Ring
  2. Star
  3. Tree
  4. Fully Connected
  5. Bus
  6. Irregular
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8
Q

Enumerate Network Classifications

A
  1. LAN - Local Area Network
  2. MAN - Metropolitan Area Network
  3. WAN - Wide Area Network
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9
Q

internetwork / internet

A

WAN that connects several LANs

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10
Q

Types of transmission technology

A
  1. broadcast / multi-access networks - also called MABN - multiple access / multi-access broadcast network
  2. point-to-point networks
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11
Q

Modes of Point-to-Point Links

A
  1. Simplex - one direction only
  2. Half-Duplex - both directions but not simultaneously
  3. Full-Duplex - both directions simultaneously
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12
Q

Peers

A

Layers of equal level

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13
Q

Interface

A

A boundary between layers that tells the layer above the interface how to access the layer below.

Defines which primitives (operations) and services the lower layer offers to the upper layer.

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14
Q

Primitive

A

an operation

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15
Q

Protocol

A

rules followed by peers

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16
Q

Entity

A

An active element in a layer, can be software or hardware

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17
Q

Layer N

A

Service Provider

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18
Q

Layer N+1

A

Service User

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19
Q

Well-Defined Interface

A
  1. Performs well-understood functions
  2. Minimizes the amount of information passed between layers, thereby avoiding redundancy and long interlayer transaction
  3. Makes it simpler to replace the implementation, as long as the replacement offers the exact same services to the upper layer
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20
Q

MABN

A

multi-access broadcast network

21
Q

ISO

A

International Organization for Standardization

22
Q

OSI

A

Open Systems Interconnection

23
Q

OSI Seven Layers

A
  1. Application Layer
  2. Presentation Layer
  3. Session Layer
  4. Transport Layer
  5. Network Layer
  6. Data Link Layer
  7. Physical Layer
24
Q

Physical Layer, 4 Important characteristics

A
  1. Mechanical
  2. Electrical
  3. Functional
  4. Procedural
25
Q

MAC

A

Medium Access Control

26
Q

TCP

A

Transmission Control Protocol

27
Q

UDP

A

User Datagram Protocol

28
Q

LAPB

A

Link Access Procedure Balanced

29
Q

VC

A

Virtual Call

30
Q

PVC

A

Permanent Virtual Circuit

31
Q

PAD

A

Packet Assembler/Disassembler

32
Q

ANSI

A

American National Standards Institute

33
Q

BSI

A

British Standards Institute

34
Q

DIN

A

Deutsches Institut fur Normung

35
Q

AFNOR

A

Association Francaise du Normalization

36
Q

IEC

A

International Electrotechnical Commission

37
Q

ITU

A

International Telecommunication Union

38
Q

CCITT

A

Comite Consultatif International Telegraphique et Telephonique

39
Q

CCIR

A

Comite Consultatif International des Radiocommunications

40
Q

IEEE

A

Institute of Electrical and Electronics Engineers

41
Q

IAB

A

Internet Architecture Board

42
Q

IRTF

A

Internet Research Task Force

43
Q

IETF

A

Internet Engineering Task Force

44
Q

RFC

A

Request for Comment

45
Q

ANS

A

Advanced Networks and Services

46
Q

CIX

A

Commercial Internet Exchange

47
Q

DoD

A

Department of Defense

48
Q

ARPA

A

Advanced Research Projects Agency

49
Q

MILNET

A

Military Networks

CMSC 205 Data Communications and Networking (1 decks)

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