Virtual circuit switching

Definition

Virtual circuit switching is a network communication method that establishes a pre-defined path or connection for the duration of a communication session, allowing data packets to be transmitted in a continuous stream. This method combines features of both circuit switching and packet switching, providing a reliable connection with the ability to utilize resources more efficiently, especially for data transmission across large networks.

5 Must Know Facts For Your Next Test

1. In virtual circuit switching, a connection is set up before data transfer begins, ensuring that all packets follow the same route through the network.
2. This technique reduces the overhead associated with setting up connections for each packet since the path is established initially and maintained throughout the session.
3. Virtual circuits can be either permanent (PVC) or switched (SVC), allowing for flexible usage depending on network requirements.
4. Data integrity is enhanced in virtual circuit switching since packets arrive in order, making it easier to manage errors compared to traditional packet switching.
5. Virtual circuit switching is particularly useful for applications that require a constant bit rate, such as video conferencing and VoIP.

Review Questions

• How does virtual circuit switching improve upon traditional packet switching regarding data transmission?
  • Virtual circuit switching improves upon traditional packet switching by establishing a dedicated path for the duration of the communication session. This setup allows packets to be sent in order without worrying about varying routes and delays, which enhances data integrity and reduces transmission overhead. Unlike traditional packet switching, where each packet may take different paths, virtual circuit switching ensures a consistent route, making it ideal for time-sensitive applications.
• Discuss the advantages and disadvantages of using virtual circuit switching compared to circuit switching.
  • The primary advantage of virtual circuit switching over circuit switching is resource efficiency; while it establishes a dedicated path like circuit switching, it allows multiple connections to share the same resources dynamically. This method can reduce wasted bandwidth when connections are not actively transmitting data. However, it may introduce some latency due to the initial setup of the virtual circuit. In contrast, circuit switching guarantees a constant quality of service since resources are reserved exclusively for each call, but it can lead to inefficient resource utilization when calls are idle.
• Evaluate how virtual circuit switching might influence future developments in network technologies.
  • Virtual circuit switching could significantly influence future developments in network technologies by providing a balanced approach between reliability and efficiency. As applications requiring high-quality real-time communications continue to grow, the demand for techniques that ensure packet ordering and low latency will increase. The ability of virtual circuits to adaptively manage bandwidth can lead to innovations in protocols and architectures that prioritize user experience while still leveraging shared resources effectively. This adaptability may drive further integration of virtual circuits into next-generation networking frameworks like 5G and beyond.

Related terms

circuit switching: A traditional method of communication where a dedicated communication path is established between two endpoints for the entire duration of the call.

packet switching: A method of data transmission where messages are divided into packets that are sent independently over the network and can take different paths to reach their destination.

frame relay: A type of wide area network (WAN) technology that uses virtual circuit switching to transport data efficiently over a shared network.