Computer Networks
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Questions and Answers

What is a characteristic of a Peer-To-Peer network?

  • All computers are connected to a main server.
  • Each computer manages itself. (correct)
  • It has a centralized system for data backup.
  • It requires a dedicated server for security.

    • What is a disadvantage of a Peer-To-Peer network?

  • It is easy to set up and maintain.
  • It requires a dedicated server for performance.
  • It has a centralized system for data backup.
  • It has a security issue. (correct)

    • What is the role of a server in a Client/Server network?

  • To manage its own resources.
  • To backup data for other clients.
  • To manage all the resources such as files, directories, and printer. (correct)
  • To communicate with other clients directly.

    • What is an advantage of a Client/Server network?

    <p>It has a dedicated server that improves the overall performance.</p> Signup and view all the answers

    What is a disadvantage of a Client/Server network?

    <p>It requires a dedicated server with large memory.</p> Signup and view all the answers

    How do clients communicate with each other in a Client/Server network?

    <p>Through a centralized server.</p> Signup and view all the answers

    What is a benefit of having a centralized system in a Client/Server network?

    <p>It improves the overall security of the network.</p> Signup and view all the answers

    What is a characteristic of a Client/Server network?

    <p>A centralized system administers the shared resources.</p> Signup and view all the answers

    What is the primary function of the Data Link layer?

    <p>To provide access control and determine which device has control over the link at a given time</p> Signup and view all the answers

    What is the main responsibility of the Network layer?

    <p>To manage device addressing, track the location of devices, and determine the best path to move data</p> Signup and view all the answers

    Which layer is responsible for routing and forwarding packets?

    <p>Network layer</p> Signup and view all the answers

    What is the process of adding source and destination addresses to the header of the frame called?

    <p>Addressing</p> Signup and view all the answers

    What is the primary function of the Transport layer?

    <p>To ensure that messages are transmitted in the correct order and without duplication</p> Signup and view all the answers

    What is the term used to describe the process of breaking down data into packets?

    <p>Packetizing</p> Signup and view all the answers

    What is the main responsibility of a router?

    <p>To provide routing services within an internetwork</p> Signup and view all the answers

    What is the term used to describe the process of connecting multiple devices on the same network?

    <p>Internetworking</p> Signup and view all the answers

    What is the frequency range of a twisted pair cable?

    <p>0 to 3.5 KHz</p> Signup and view all the answers

    What determines the degree of reduction in noise interference in a twisted pair?

    <p>The number of turns per foot</p> Signup and view all the answers

    What is the maximum data rate that Category 5 unshielded twisted pair can support?

    <p>200Mbps</p> Signup and view all the answers

    What is the main disadvantage of unshielded twisted pair?

    <p>It can only be used for shorter distances</p> Signup and view all the answers

    What is the main characteristic of shielded twisted pair?

    <p>It provides a higher data transmission rate</p> Signup and view all the answers

    What is the main advantage of unshielded twisted pair?

    <p>It is cheap</p> Signup and view all the answers

    What is the main disadvantage of shielded twisted pair?

    <p>It is expensive compared to UTP and coaxial cable</p> Signup and view all the answers

    What is the main difference between unshielded twisted pair and shielded twisted pair?

    <p>The presence of mesh surrounding the wire</p> Signup and view all the answers

    What is the frequency range of terrestrial microwave?

    <p>4-6 GHz to 21-23 GHz</p> Signup and view all the answers

    What is the main advantage of using microwave transmission over cables?

    <p>It is free from land acquisition</p> Signup and view all the answers

    What is the main limitation of microwave transmission?

    <p>It is affected by environmental conditions</p> Signup and view all the answers

    What happens to the signal when it is transmitted using microwave transmission?

    <p>It is moved out of phase by using microwave transmission</p> Signup and view all the answers

    What is the main advantage of using satellite communication?

    <p>It is more reliable nowadays</p> Signup and view all the answers

    What is the main function of a satellite in satellite communication?

    <p>It amplifies the signal from the earth station</p> Signup and view all the answers

    What is the main limitation of satellite communication?

    <p>It is limited by the allocation of bandwidth</p> Signup and view all the answers

    What is the main concern of microwave transmission?

    <p>It is susceptible to eavesdropping</p> Signup and view all the answers

    What is the main purpose of multiplexing?

    <p>To allow multiple signals to share a common medium</p> Signup and view all the answers

    What is the device used for demultiplexing?

    <p>Demultiplexer (DEMUX)</p> Signup and view all the answers

    What is the principle behind multiplexing?

    <p>Many-to-one</p> Signup and view all the answers

    What is the result of multiple signals sharing a common medium without multiplexing?

    <p>Signal collision</p> Signup and view all the answers

    Who developed the telephone carrier multiplexing?

    <p>George Owen Squier</p> Signup and view all the answers

    What is the output of a multiplexer?

    <p>A single output line</p> Signup and view all the answers

    In what year did multiplexing originate in telegraphy?

    <p>1870s</p> Signup and view all the answers

    What is the effect of multiplexing on transmission services?

    <p>Reduces the cost of transmission services</p> Signup and view all the answers

    Study Notes

    Peer-to-Peer Network

    • In a peer-to-peer network, if one computer stops working, the others will not be affected.
    • Each computer manages itself, making it easy to set up and maintain.
    • Disadvantages include:
      • No centralized system for data backup.
      • Security issues since each device manages itself.

    Client/Server Network

    • A client/server network is designed for end users (clients) to access resources from a central computer (server).
    • The server manages all resources, including security and network management.
    • Clients communicate with each other through the server.
    • Advantages include:
      • Centralized system for data backup.
      • Improved performance and security.
      • Faster resource sharing.
    • Disadvantages include:
      • High cost of the server and its operating system.
      • Requires a dedicated server with large memory.

    Network Layer (Layer 3)

    • Manages device addressing and tracking.
    • Determines the best path for data transmission based on network conditions and priority.
    • Responsible for routing and forwarding packets.
    • Routers are layer 3 devices used for routing services.
    • Protocols used for routing include IP and IPv6.
    • Functions include:
      • Internetworking: connecting different devices.
      • Addressing: adding source and destination addresses to packets.
      • Routing: determining the best path for data transmission.
      • Packetizing: dividing data into packets.

    Transport Layer (Layer 4)

    • Ensures that messages are transmitted in the correct order and without duplication.
    • Responsible for complete data transfer.
    • Provides error-free transfer of data.

    Guided Media

    • Types:
      • Twisted Pair:
        • Made up of two insulated copper wires twisted together.
        • Categories: 1, 2, 3, 4, 5, with increasing speeds.
        • Advantages: cheap, easy to install, lightweight.
        • Disadvantages: limited distance due to attenuation.
      • Shielded Twisted Pair (STP):
        • Has a mesh surrounding the wire for higher transmission rates.
        • Advantages: higher capacity, easier to install, shielded.
        • Disadvantages: more expensive than UTP.

    Microwave

    • Frequency range: 4-6 GHz to 21-23 GHz.
    • Bandwidth: 1-10 Mbps.
    • Short distance: inexpensive.
    • Long distance: expensive due to tower requirements.
    • Attenuation: affected by environmental conditions and antenna size.
    • Advantages:
      • Cheaper than cable transmission.
      • No land acquisition required.
      • Easy communication in terrains.
      • Communication over oceans possible.
    • Disadvantages:
      • Susceptible to eavesdropping.
      • Out of phase signal.
      • Weather conditions affect signal.
      • Limited bandwidth.

    Satellite Microwave Communication

    • A satellite is a physical object that revolves around the earth.
    • Satellite communication is more reliable and flexible than cable and fiber optic systems.
    • How it works:
      • Signal is transmitted from earth station to satellite.
      • Satellite amplifies the signal.
      • Multiplexing is used to combine multiple data streams.
      • Signal is transmitted back to earth station.
    • Multiplexing:
      • Why: to avoid collision and share bandwidth.
      • Concept: combining multiple signals into one.
      • History: originated in telegraphy in the 1870s.
      • Types: many-to-one, one-to-many.

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    Description

    This quiz covers the basics of computer networks, including the advantages and disadvantages of Peer-To-Peer networks and the basics of Client/Server networks.

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