Overview
A network switch is a hardware device that connects multiple devices within a local area network (LAN), such as computers, servers, and printers. It operates at the data link layer of the OSI model, forwarding data frames to the correct destination device based on MAC addresses. Switches form the backbone of enterprise networks by enabling fast, reliable, and organised communication.
How It Works
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Packet forwarding: When a device sends data, the switch reads the frame’s MAC address and directs it only to the intended recipient, reducing unnecessary traffic.
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Segmentation: Switches divide networks into segments, minimising collisions and improving performance.
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Full-duplex communication: Allows devices to send and receive data simultaneously, increasing efficiency.
Key Features
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Scalability: Supports dozens to thousands of ports for enterprises of different sizes.
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Performance: Modern switches handle speeds from 1 Gbps to 400 Gbps.
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Layer 2 and Layer 3 switches: Layer 2 switches operate at the data link layer, while Layer 3 switches add routing functions.
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Power over Ethernet (PoE): Some switches deliver both power and data through a single cable, useful for devices like IP phones or cameras.
Use Cases
- Enterprise LANs: Connecting workstations, servers, and printers with high-speed reliability.
- Data centres: Creating spine-leaf architectures that provide low latency and redundancy.
- Campus networks: Managing large-scale deployments across multiple buildings.
- IoT ecosystems: Powering and connecting thousands of sensors and devices.
Next Steps
Proactive is a Cisco Gold Partner, trusted by enterprises to deliver secure, high-performance switches and routers. We help businesses build scalable, reliable networks tailored to their needs.
