Data and Computer Network Communications Flashcards

1
Q

What is a Communications Model ?

A

A communications Model consists of

Source - Generates data to be transmitted

Transmitter - Converts data into transmittable signals

Transmission system - Carries data

Receiver - Converts received signal into data

Destination - Takes incoming data

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2
Q

What is Network Communications ?

A
  • Computer network - an interconnection of computers and computing equipment using either wires or radio waves over small or large geographic distances
  • Voice network - a network that transmits telephone signals

Data network - a network that transmits computer data

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3
Q

What is Computer Network ?

A

Computer Network: A connection between two or more computers to exchange data or provide shared access to resources.

  • Node: Any device that can send or receive data via a Network.

Nodes are linked by communications cabling or radio waves.

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4
Q

What is Wireless PAN ?

A
  • Personal Area Network (PAN): Connects computing and other devices in the immediate vicinity of an individual to support the activities of that individual
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5
Q

What is Local Area Networks (LANs) ?

A
  • A LAN (Local Area Network) is a type of computer network where nodes are connected at high speed in a confined geographical area
  • Network service area usually limited to a given office area, floor, or building.
  • All components of the LAN are commonly owned by the organization that uses it.
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6
Q

What is Metropolitan Are Network (MAN) ?

A

Medium speed network that connects sites over distances up to 50 miles. Generally used by organizations that have several locations over the same city.

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7
Q

What is Wide area network (WAN) ?

A

WANs are made up of LANs connected by lower speed long distance links. WANs usually cover a significant geographical area.

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8
Q

What is Network Topology ?

A
  • The physical topology (part of the physical layer) refers to the physical arrangement of a network’s stations, switches, routers, and transmission lines.
  • The logical topology (part of the data link layer) describes how the data flows through the physical topology or the actual pathway of the data.
  • Different network (and internet) standards specify different topologies.
  • The physical and logical topologies are not always the same
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9
Q

What is BUS Topology ?

A
  • All network devices connected to a common cable in logical linear fashion.
  • Transmissions are sent along the length of the bus segment.
  • Examples: obsolete Ethernet 10Base5 and 10Base2, both using coaxial cable
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10
Q

What is the essential part of A Bus Topology Connecting Stations ?

A

One long cable (main cable) acts as backbone to link all the devices in a network. Nodes are connected to the bus cable by drop lines and taps (connectors).

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11
Q

What is Ring Topology ?

A
  • Continuous path for data with no logical beginning or ending point.
  • Examples: obsolete IBM token ring and FDDI (fiber distributed data interface).
  • Each node attaches to a repeater. When a device receives a signal intended for another device, its repeater regenerates the data signal and passes it along, which helps keep the signal from degrading
  • Each node attaches to a repeater. When a device receives a signal intended for another device, its repeater regenerates the data signal and passes it along, which helps keep the signal from degrading
  • Data frame circulates past all devices
  • Destination device recognizes the address and copies the frame.
  • Frame continues circulating back to source where it is removed
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12
Q

What is Star Topology ?

A
  • Connection from each device to a central location, usually a hub or switch.
  • Most commonly used physical topology
  • Failure of one cable does not bring down network
  • Examples: Ethernet 10BaseT and 100BaseTX, both using UTP cord.
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13
Q

A Fiber Opic Backbone with Category 5

A
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14
Q

A Pair of Bridges and Switch Combination ?

A
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15
Q

A Communications Model ?

A
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16
Q

A Bus Topology Connnecting Stations

A