Which of the following technologies requires a logical...

Which of the following technologies requires a logical connection between the sending and receiving devices?
A. Circuit switching
B. Virtual-circuit packet switching
C. Message switching
D. High-density circuit switching

Key Concepts

Message Switching

Message switching is a store-and-forward networking method where entire messages are sent from one node to the next without the need for a pre-established connection between the sender and receiver. Each intermediate node receives and stores the message before forwarding it on, which allows for flexibility but typically introduces delay compared to connection-oriented methods.

Logical Connection

A logical connection is an abstract link established between two communicating devices, allowing them to exchange data through agreed protocols without necessarily having a dedicated physical pathway. This connection is more about the communication state and session rather than a fixed physical channel.

Connection-Oriented Communication

Connection-oriented communication is a method where devices set up a dedicated logical (or physical) connection before exchanging information. This ensures that the data packets follow a consistent path and arrive in sequence, which is crucial in applications where reliable delivery is needed.

Virtual-Circuit Packet Switching

Virtual-circuit packet switching is a form of packet switching that combines the benefits of connection-oriented communication and the efficiency of packet switching. In this method, a logical connection (or virtual circuit) is established between the sender and receiver before transmission begins, guiding the packets along a predetermined path while still allowing them to be switched dynamically at intermediate nodes.

Circuit Switching

Circuit switching is a networking technology where a dedicated communication path is established between the sending and receiving devices for the duration of the communication session. While often involving a physical circuit, it represents a direct connection that remains reserved for the entire session, contrasting with the dynamic paths in packet switching.

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