What is a Switch
A switch, or network switch, is a device that transfers data between devices within a local area network (LAN). A switch analyzes MAC addresses and sends traffic only to the required port, rather than to all devices at once. This allows the network to operate faster, more reliably, and without unnecessary load.
A switch is a core component of any wired network and connects computers, servers, printers, and other network equipment to one another.
How a network switch works
When a device connects to the network, the switch memorizes its MAC address and associates it with a specific physical port. Upon receiving an Ethernet frame, the switch checks the MAC address table and determines which port the data should be sent to.
If the destination address is not yet known, the switch temporarily floods traffic to all ports except the incoming one. Once the target device responds, the switch updates the MAC address table and subsequently forwards data directly to that device only.
Types of switches
Switches differ in configuration capabilities and area of application. There are three main types.
Unmanaged switches work right out of the box and require no configuration. They are used in home networks and small offices where simple device connectivity is sufficient.
Managed switches support VLAN, QoS, traffic monitoring, the STP protocol, and data transmission priority settings. These models are used in corporate infrastructure and data centers where flexibility, security, and network control are essential.
PoE switches (Power over Ethernet) deliver power along with data over a single Ethernet cable. This simplifies the connection of IP cameras, Wi-Fi access points, and VoIP phones, as they do not require a separate power source.
| Switch Type | Features | Where Used |
| Unmanaged | Works without configuration | Home networks, small offices |
| Managed | VLAN, QoS, monitoring | Corporate networks, data centers |
| PoE Switch | Power delivery over Ethernet | Video surveillance, Wi-Fi |
How a network switch differs from a router
A switch and a router often work together, but they serve different purposes. The key difference lies in which layer each device operates at and what data it handles.
A switch operates within a single local network and forwards frames between devices using MAC addresses. A router connects different networks together and handles IP routing. Simply put, a switch is responsible for internal data exchange within a network, while a router handles internet access and communication between networks.
| Device | Purpose | Addressing |
| Switch | Data exchange within a single network | MAC addresses (data link layer) |
| Router | Connecting different networks and internet access | IP addresses (network layer) |
Advantages of using a switch
A network switch improves local network performance and allows a large number of devices to be connected without a noticeable loss of speed. Managed models also provide the ability to segment the network via VLAN, configure traffic priorities using QoS, and control connection security.
Thanks to these capabilities, the network switch remains a core component of modern Ethernet infrastructure. It is used in offices, server rooms, cloud platforms, and industrial networks.
For service quality management, a switch alone is usually not enough: it can set priorities at the network level, but does not always understand which application is generating the load. The QoS solution helps control and prioritize traffic at the operator level.
