Network Switches: Why You Need One at Home and in the Office, How Managed Differs from Unmanaged and How a Single Cable Loop Can Bring Down the Whole Network

A home router usually has only three or four network ports. While a computer and a TV are connected, that's enough. But add a games console, a NAS, a printer, a few cameras or access points in the far rooms, and you run out of ports. An office runs short from day one: a dozen desks, an MFP, a server, phones. This is where a network switch comes in — a device that joins wired devices into one network. It looks like a simple "box of ports", but the speed and stability of the whole network depend on how it's chosen and connected.

What a switch does

A switch takes data from one device and forwards it only to the device it's meant for, not to everyone. It remembers which device is on which port and lets several pairs of devices exchange data at full speed simultaneously. The router, meanwhile, handles the internet connection and assigns addresses. So the typical layout is: router — one cable to the switch — cables from the switch to every device and access point.

How to choose a switch

• Port speed. Gigabit ports are the minimum today. A 100 Mbit/s switch becomes a bottleneck even for an ordinary home plan. For fast NAS devices, workstations and Wi-Fi 6/7 access points, consider 2.5 Gbit/s ports.
• Ports to spare. If you need 6 now, get 8; if 12, get 16 or 24. Devices always get added.
• PoE. If cameras, access points or IP phones will connect to the switch, you need PoE support with a sufficient total power budget.
• Passive cooling. For a flat, the switch should be fanless and silent.
• Housing. A metal case dissipates heat better; for a cabinet, choose a rack-mountable model.

Managed or unmanaged

An unmanaged switch works out of the box with no settings — plug it in and use it. For most flats that's enough. A managed (or "smart") switch has a web interface and lets you split the network into virtual segments (VLANs) — for example, separating cameras and guest Wi-Fi from work computers — set traffic priorities, loop protection, port monitoring and remote PoE power control. In an office, guesthouse or café where networks need separating, a managed switch is almost always worth it.

A loop — the most insidious problem

If one cable is accidentally plugged with both ends into the same switch, or two switches are connected by two cables, a loop forms. Data starts circling endlessly and multiplying — a broadcast storm. Within seconds the whole network stops working: everyone loses internet, the switch lights blink non-stop, and the router may freeze. It often happens when a cleaner or an employee "tidily" plugs a dangling cable into a free socket. Unmanaged switches are usually unprotected against loops, while managed ones can detect them and shut down the offending port.

Other common faults

• A failed power supply — on cheap switches the external adapter is often the first thing to die, and the whole network drops or devices lose connection under load.
• Overheating in a closed cabinet without ventilation, especially in summer — the switch starts freezing.
• A port running at 100 Mbit/s instead of gigabit because of a damaged cable or badly crimped connector.
• A chain of several cheap switches connected one after another — each link adds a point of failure.
• A thunderstorm or power surge burns out ports connected to outdoor cables.

Placement

The switch is best placed at a central point where cables from the rooms converge: a low-voltage panel, a niche, a cabinet or a shelf next to the router. In an office, it goes in the comms cabinet with the router, patch panel and UPS. It's important to provide ventilation, cable labelling and order: a year from now someone will be looking for the cable to accounts, and labelled ports will save hours.

What our technician does

1. Counts the devices and assesses the load and the need for PoE, VLANs and spare ports.
2. Selects a switch to suit the task and budget — no unnecessary features, but no bottlenecks either.
3. Mounts the switch in a cabinet or panel, connects and labels the cables, and installs a UPS.
4. Configures a managed switch: VLANs, loop protection, priorities and monitoring.
5. Tests the speed on every port and the network's stability under load.

A real example

At a training centre in Chugureti, the network dropped out completely for 10–20 minutes several times a week and then came back "on its own". The provider found no problems on the line. Our technician found three unmanaged switches chained together in the classrooms, and a cable plugged into one of them at both ends: a teacher periodically plugged it in to "charge" a laptop from a "spare wire", creating a loop. We replaced the chain with a single managed switch with loop protection in a cabinet, ran cables to the classrooms, separated the students' network from the administration's and labelled every port. The outages stopped completely.

Call a technician

If you're short of ports, the network keeps dropping out or you need a wired network designed, we'll come to any district of Tbilisi around the clock. Learn more on our local network installation, local network setup and network troubleshooting pages.