What is the purpose of switches in circuit switched networks ?

Switches in circuit-switched networks serve the fundamental purpose of establishing and maintaining dedicated communication paths, or circuits, between communicating parties for the duration of a communication session. In circuit-switched networks, such as traditional telephone networks, switches play a crucial role in setting up these paths by dynamically connecting segments of the network as needed. Once a circuit is established, it remains dedicated to the communicating parties until the session ends, ensuring constant bandwidth and predictable transmission quality. This method of dedicated connection in circuit-switched networks guarantees reliable and uninterrupted communication, making it suitable for voice calls and real-time data transmission where delay and jitter must be minimized.

The primary purpose of circuit switching is to provide a dedicated communication path between two or more parties for the duration of a communication session. Unlike packet switching, where data is divided into packets that travel independently across the network and may take different routes, circuit switching establishes a continuous pathway through the network for the entire duration of the communication session. This dedicated path ensures that resources, such as bandwidth, are allocated exclusively to the communication session, leading to consistent transmission quality and predictable performance. Circuit switching is commonly used in applications requiring real-time communication, such as voice calls and video conferencing, where maintaining continuous connectivity and minimizing latency are critical.

Switches in computer networks serve to connect multiple devices within a local area network (LAN) or between LANs, enabling efficient communication and data exchange. Network switches operate at the data link layer (Layer 2) of the OSI model and are responsible for forwarding data packets to their destination devices based on MAC addresses. By dynamically learning the MAC addresses of connected devices and maintaining a forwarding table, switches facilitate fast and reliable data transmission within the network. Unlike routers, which operate at the network layer (Layer 3) and make forwarding decisions based on IP addresses, switches provide high-speed connectivity within LANs and enhance network performance by reducing collisions and improving network efficiency.

The purpose of switching in general refers to the process of directing data or information from one point to another within a network. In the context of network communication, switching involves determining the optimal path or route for data packets to travel from a source device to a destination device. Switching devices, such as network switches and routers, play a crucial role in this process by making forwarding decisions based on specific criteria, such as MAC addresses in the case of switches or IP addresses in the case of routers. Switching ensures efficient data transmission, minimizes latency, and optimizes network performance by directing data along the most appropriate pathways within the network infrastructure.

One of the main advantages of circuit-switched networks is their ability to provide guaranteed bandwidth and consistent transmission quality throughout the duration of a communication session. In circuit-switched networks, a dedicated communication path, or circuit, is established between communicating parties at the beginning of a session. This dedicated path ensures that resources, such as bandwidth, are allocated exclusively to the communication session, eliminating contention and ensuring reliable data transmission. Additionally, circuit-switched networks are well-suited for real-time applications, such as voice calls and video conferencing, where maintaining constant connectivity and minimizing latency are critical for ensuring high-quality communication.

The primary difference between packet-switched and circuit-switched networks lies in how they handle data transmission and network resources. In a circuit-switched network, a dedicated communication path, or circuit, is established between communicating parties for the entire duration of a communication session. This dedicated path guarantees continuous bandwidth and transmission quality but may be less efficient in utilizing network resources when the circuit is not fully utilized. In contrast, packet-switched networks, such as the Internet, divide data into packets that travel independently across the network and may take different routes to reach their destination. Packet switching allows for more efficient use of network resources and supports variable traffic loads but may introduce delays and jitter due to packet routing and processing.

Routing in circuit-switched networks involves the process of determining and setting up the optimal path or route for a communication session between source and destination parties. Unlike packet-switched networks where routing decisions are based on IP addresses and can vary for each packet, routing in circuit-switched networks establishes a dedicated pathway through the network infrastructure. Routing algorithms in circuit-switched networks aim to optimize resource allocation, minimize transmission delays, and ensure continuous connectivity for the duration of the communication session. This routing process ensures that once a circuit is established, data transmission occurs efficiently and reliably along the predefined path until the session concludes.

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