Advantages and Disadvantages of Circuit Switching
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Questions and Answers

What is a key advantage of Circuit Switching?

  • Message stored and forwarded
  • Dynamic routing
  • Low cost
  • Dedicated communication channel (correct)
  • What is a disadvantage of Circuit Switching mentioned in the text?

  • No data transmission delay
  • Efficient use of path capacity
  • Quick connection establishment
  • Long time to establish connection (correct)
  • Which characteristic best describes Message Switching?

  • Dedicated path establishment
  • Complete message unit transfer (correct)
  • Fixed bandwidth
  • Wastage of path capacity
  • Why is Circuit Switching considered more expensive than other switching techniques?

    <p>Dedicated path requirement for each connection</p> Signup and view all the answers

    How does Circuit Switching lead to inefficient use of path capacity?

    <p>Capacity wasted when no data transfer occurs</p> Signup and view all the answers

    Which term describes the type of network where Message Switching operates?

    <p>Store and forward network</p> Signup and view all the answers

    What are the three phases of circuit switching technology?

    <p>Circuit establishment, Data transfer, Circuit disconnect</p> Signup and view all the answers

    Which technology in circuit switching uses physically separate crosspoints?

    <p>Crossbar switch</p> Signup and view all the answers

    What is a disadvantage of a Crossbar switch?

    <p>Cost increases with the number of stations</p> Signup and view all the answers

    How is a Multistage Switch different from a Crossbar switch?

    <p>Multistage Switch has fewer crosspoints than Crossbar switch</p> Signup and view all the answers

    What does Space Division Switching offer in terms of switches?

    <p>Nonblocking switches with high speed and high capacity</p> Signup and view all the answers

    What is the purpose of an acknowledgment signal sent by the receiver after data transmission?

    <p>To confirm that the message has been received</p> Signup and view all the answers

    Why is the packet switching technique considered cost-effective?

    <p>It does not require massive secondary storage for packet storage</p> Signup and view all the answers

    In packet switching, what makes it a reliable communication technique?

    <p>Packets can be rerouted if a node is busy</p> Signup and view all the answers

    Why is packet switching considered efficient compared to other techniques?

    <p>It allows many users to use the same communication channel simultaneously</p> Signup and view all the answers

    What differentiates the Datagram approach from the Virtual Circuit approach?

    <p>In Datagram, packets are routed based on labels; in Virtual Circuit, a dedicated path is established.</p> Signup and view all the answers

    Study Notes

    Circuit Switching

    • Communication through circuit switching has three phases: circuit establishment, data transfer, and circuit disconnect.
    • Circuit switching can use two technologies: Space Division Switches and others (not specified).
    • Space Division Switches have high speed, high capacity, and non-blocking switches.

    Space Division Switches

    • A crossbar switch is a type of Space Division Switch that has n input lines and n output lines with n² intersection points (crosspoints).
    • Disadvantage of Crossbar switch: The number of crosspoints increases with the number of stations, making it expensive for large switches.
    • Solution: Use a multistage switch, which reduces the number of crosspoints and provides alternative paths if one path fails.

    Advantages and Disadvantages of Circuit Switching

    • Advantages: Dedicated communication channel, fixed bandwidth, and low delay in data transmission after connection establishment.
    • Disadvantages: Long connection establishment time (~10 seconds), expensive due to dedicated path requirement, and inefficient use of capacity if no data is transferred.

    Message Switching

    • Message switching is a technique where a message is transferred as a complete unit and routed through intermediate nodes, where it is stored and forwarded.
    • No dedicated path is established between sender and receiver; destination address is appended to the message.
    • Provides dynamic routing through intermediate nodes based on message information.
    • Each node stores the entire message and forwards it to the next node (store and forward network).
    • Acknowledgment signal is sent after transmission, and a clear signal is sent for connection termination.
    • Cost-effective: No massive secondary storage required for switching devices.
    • Reliable: Packets can be rerouted if a node is busy, ensuring reliable communication.
    • Efficient: No established path required prior to transmission, and multiple users can use the same channel simultaneously, making use of available bandwidth efficient.

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    Description

    Learn about the benefits and drawbacks of Circuit Switching technology. Understand how it provides a dedicated communication channel with fixed bandwidth, but also experiences delays during connection establishment and can be costly compared to other switching techniques.

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