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Computer Networks: Physical Topology
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Computer Networks: Physical Topology

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Questions and Answers

What is a characteristic of a hybrid topology?

  • It is a combination of two or more topologies (correct)
  • It is a simple star topology
  • It is a mesh topology
  • It is a type of bus topology
  • What was the issue with the old LAN connection method?

  • Packets were received by all hosts, not just the intended recipient (correct)
  • It was too expensive
  • It was too slow
  • It required too much maintenance
  • What is a characteristic of a LAN?

  • It is publicly owned
  • It connects hosts in a single office, building, or campus (correct)
  • It requires a WAN to function
  • It interconnects devices over a wide geographical area
  • What is the main difference between a LAN and a WAN?

    <p>LAN is small in size, WAN is large in size</p> Signup and view all the answers

    What is a WAN used for?

    <p>To connect devices over a wide geographical area</p> Signup and view all the answers

    What is an identifier for a host in a LAN?

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

    What type of WAN interconnects devices using switches or routers?

    <p>Switched WAN</p> Signup and view all the answers

    Who normally owns a WAN?

    <p>A communication company</p> Signup and view all the answers

    What is the purpose of a smart connecting switch in a LAN?

    <p>To recognize the destination address of a packet</p> Signup and view all the answers

    What is a type of WAN that connects two devices directly?

    <p>Point-to-point WAN</p> Signup and view all the answers

    Study Notes

    Physical Topology

    • A multipoint connection is where more than two devices share a single link, with capacity shared spatially or temporally.
    • In a mesh topology, every device has a dedicated point-to-point link to every other device, requiring n(n-1)/2 duplex-mode links for n nodes.

    Advantages and Disadvantages of Mesh Topology

    • Advantages: dedicated links, robustness, privacy or security, easy fault identification and isolation.
    • Disadvantages: high cabling and I/O port requirements, difficult installation and reconnection, expensive hardware.

    Physical Topology: Star

    • In a star topology, each device has a dedicated point-to-point link only to a central controller (hub), with devices not directly linked to each other.

    Advantages and Disadvantages of Star Topology

    • Advantages: less expensive than mesh, easy to install and reconfigure, less cabling, robustness (if one link fails, only that link is affected).
    • Disadvantages: dependency on the hub, if the hub fails, the whole system fails.

    Physical Topology: Bus

    • In a bus topology, one long cable acts as a backbone to link all devices in a network.

    Advantages and Disadvantages of Bus Topology

    • Advantages: easy installation, backbone cable can be laid along the most efficient path.
    • Disadvantages: difficult reconnection and fault isolation, signal reflection at taps can cause signal degradation, a fault in the bus cable stops all transmission.

    Physical Topology: Ring

    • In a ring topology, each device has a dedicated point-to-point connection with only the two devices on either side of it, with a signal passed along the ring in one direction.

    Advantages and Disadvantages of Ring Topology

    • Advantages: easy to add or delete devices, fault isolation is simplified, a signal is circulating at all times.
    • Disadvantages: unidirectional traffic, a break in the ring can disable the entire network (can be solved using a dual ring or switch).

    Network Types

    • Criteria for distinguishing network types include size, geographical coverage, and ownership.
    • Two main types of networks: Local Area Network (LAN) and Wide Area Network (WAN).

    Local Area Network (LAN)

    • A LAN connects hosts in a single office, building, or campus, and is usually privately owned.
    • Each host in a LAN has a unique identifier (address) that defines the host in the LAN.
    • A packet sent by a host to another host carries both the source host's and destination host's addresses.

    Wide Area Network (WAN)

    • A WAN is an interconnection of devices capable of communication, with a wider geographical span than a LAN.
    • A WAN interconnects connecting devices such as switches, routers, or modems, and is normally created and run by communication companies and leased by organizations.
    • Two distinct examples of WANs: point-to-point WANs and switched WANs.

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    Related Documents

    01. Chapter01_Introduction.pdf

    Description

    Learn about multipoint connections and mesh topology, including their advantages and disadvantages in computer networks.

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