The correct option is
D. A dedicated channel must be established between two parties through the period of Communication.
Explanation of the Correct Answer
- Understanding Circuit Switching:
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Circuit switching is a method of communication where a dedicated communication path or channel is established between two parties for the duration of the communication session. This means that once the connection is made, the entire bandwidth of the channel is reserved for that specific communication, allowing for a continuous and stable connection.
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How Circuit Switching Works:
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When a call is made (for example, in traditional telephone systems), a circuit is established between the caller and the receiver. This involves several steps:
- Call Setup: The system finds an available path through the network.
- Connection Establishment: The path is reserved, and the connection is established.
- Data Transfer: The communication occurs over the established path.
- Call Termination: Once the communication is finished, the circuit is released for use by others.
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Advantages of Circuit Switching:
- Consistent Quality: Since the channel is dedicated, the quality of the communication is consistent and does not fluctuate.
- Real-time Communication: It is ideal for real-time applications like voice calls, where delays and interruptions can be detrimental.
Why the Other Options are Incorrect
- Option A: It is not ideal for real-time communication:
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This statement is incorrect because circuit switching is actually very well-suited for real-time communication. The dedicated channel ensures that there are no delays or interruptions, making it ideal for applications like voice calls and video conferencing.
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Option B: Messages must be divided into packets before they are sent:
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This statement is more applicable to packet switching, not circuit switching. In circuit switching, data is sent in a continuous stream over the established circuit, rather than being divided into packets. Packet switching, on the other hand, breaks messages into packets that are sent independently and may take different paths to reach the destination.
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Option C: It does not require any dedicated channel to be established between two parties:
- This statement is fundamentally incorrect. The defining characteristic of circuit switching is that it does require a dedicated channel to be established for the duration of the communication. Without this dedicated channel, the system would not be functioning as a circuit-switched network.
Summary of Key Points
- Circuit Switching: Establishes a dedicated communication path for the duration of the call.
- Real-time Communication: Ideal for applications requiring consistent quality, such as voice calls.
- Data Transmission: Involves continuous data flow rather than packet division.
- Dedicated Channel: Essential for circuit switching, ensuring no interruptions during communication.
By understanding these concepts, you can better grasp the principles of circuit switching and its applications in communication systems.