An Ethernet switch expands the number of wired LAN ports available on a router. For most homes, an unmanaged Gigabit or 2.5-Gigabit switch is inexpensive, automatic, and easy to install.

Ethernet switch connected to a router and multiple wired devices

Before you begin

Write down the model numbers of the modem, router, adapters, television, or computer involved. Check the manufacturer documentation for supported ports and standards, then install available firmware and operating-system updates. This avoids buying an adapter that fits physically but cannot carry the required signal.

What the switch does

A switch connects devices within the local network. The router still assigns IP addresses, provides firewall and internet routing, and separates the home network from the provider. Do not substitute a basic switch for the router.

Choose the right switch

Count the devices you plan to connect and leave room for growth. Five- and eight-port unmanaged switches suit many homes. Match the switch speed to the router, computers, access points, and cabling. A faster switch will not make an internet plan faster, but it can improve transfers between local devices.

For current equipment options, compare relevant home-networking products on Amazon and confirm compatibility before ordering.

Connect the switch correctly

Use an Ethernet cable from any router LAN port to any normal port on a modern auto-sensing switch. Connect computers, televisions, game consoles, access points, or network storage to the remaining ports. Connect the switch after the router, not directly to a standalone modem.

Placement and troubleshooting

Use Cat5e or better cable for Gigabit Ethernet and appropriate cabling for higher speeds and longer runs. Keep the switch ventilated. If a device does not connect, check link lights, replace the cable, try another port, and confirm the router’s DHCP service is enabled.

A reliable troubleshooting order

Change one thing at a time. Verify power and indicator lights, reseat every cable, restart the equipment in the correct order, and test with a known-good cable or device. Begin with the shortest and simplest connection, then add switches, adapters, access points, or wireless links one at a time. This method identifies the failing layer without erasing working settings.

Final checklist

  • Confirm the service, ports, cabling, and standards supported by your exact equipment.
  • Install current firmware and use strong, unique administrator and Wi-Fi passwords.
  • Test one connection at a time and keep the layout simple enough to troubleshoot.

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