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CIS 430 > Midterm > Flashcards

Midterm Flashcards

1
Q

Telecommunication

A

Communication at a distance

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2
Q

Data

A

Information presented in whatever form is agreed upon by the parties creating and using the data

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3
Q

Data communications

A

The exchange of data between two devices via some form of transmission medium such as a wire cable

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4
Q

Message

A

The message is the information (data) to be communicated

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5
Q

Sender

A

The device that sends the data message

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6
Q

Receiver

A

The device that receives the message

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7
Q

Transmission medium

A

The transmission medium is the path by which a message travels from sender to receiver

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8
Q

Protocol

A

A protocol is a set of rules that govern data communications

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9
Q

Simplex

A

The communication is unidirectional

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10
Q

Example of Simplex

A

Keyboards and traditional monitors

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11
Q

Half-duplex

A

Each station can both transmit and
receive, but not at the same time

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12
Q

Example of Half-duplex

A

Walkie-talkies and citizen band radios

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13
Q

Full-duplex

A

Both stations can transmit and
receive simultaneously

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14
Q

Example of Full-duplex

A

Telephone network

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15
Q

Network

A

A set of devices connected by communication links

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16
Q

Point-to-point

A

A point-to-point connection provides
a dedicated link between two devices

17
Q

Multipoint

A

A connection is one in which more than two specific devices share a single link

18
Q

Mesh

A

Every device is connected to another device via a particular channel

19
Q

Advantages of Mesh

A
  • robust.
  • the fault is diagnosed easily
  • reliable
  • security
  • privacy
20
Q

Disadvantages of Mesh

A
  • installation and configuration are difficult
  • the cost of cables is high
  • the cost of maintenance is high
21
Q

Star

A

All the devices are connected to a
single hub through a cable.

22
Q

Bus

A

A network type in which every computer and network device is connected to a single cable.

23
Q

Ring

A

Each device has a dedicated point-to-point connection with only the two devices on either side of it.

24
Q

Hybrid

A

A main star topology with each branch connecting several stations in a bus topology

25
Q

Seven Layers of OSI

A
  • Application
  • Presentation
  • Session
  • Transport
  • Network
  • Data link
  • Physical
26
Q

Physical layer

A

Responsible for movements of individual bits from one hop (node) to the next

27
Q

Functions of physical layer

A
  • Physical characteristics of interfaces and medium
  • Representation of bits:
  • Data rate
  • Synchronization of bits
  • Line configuration
  • Physical topology
  • Transmission mode
28
Q

Data link layer

A

Responsible for moving frames from one hop (node) to the next (hop-to-hop delivery)

29
Q

Functions of data link layer

A
  • Framing
  • Physical Addressing
  • Flow Control
  • Error Control
  • Access Control
30
Q

Network layer

A

Responsible for the delivery of individual packets from the source host to the destination host

31
Q

Functions of network layer

A
  • Logical Addressing
  • Routing
32
Q

Transport layer

A

Responsible for the delivery of a message from one process to another

33
Q

Functions of transport layer

A
  • Segmentation and reassembly
  • Connection control
  • Service point addressing
34
Q

Session layer

A

Responsible for dialog control and synchronization

35
Q

Functions of session layer

A
  • Synchronization
  • Dialog control
36
Q

Presentation layer

A

Responsible for translation, compression, and encryption

37
Q

Functions of Presentation layer

A
  • Translation
  • Compression
  • Encryption
38
Q

Application layer

A

Responsible for providing services to the user

39
Q

Functions of application layer

A
  • Network virtual terminal
  • File transfer, access, and management
  • Mail services

CIS 430 (2 decks)

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