Plug one end into your router, the other into your device

An Ethernet cable has identical connectors on both ends that look like oversized phone jacks. Take one end and push it straight into any available port on the back of your router — you will hear a small click when it seats properly. Take the other end and push it into the Ethernet port on your computer, laptop, or device the same way. That is the entire physical connection. Your device should recognize the wired network within a few seconds.

The cable itself does not need to be configured or activated. Once both ends are plugged in, your device will either connect automatically or ask you to select the network name from a list. If your router requires a password, you will enter it the same way you would for Wi-Fi.

Key Takeaways

  • Ethernet ports on routers and computers look like phone jacks and accept cables with identical connectors on both ends.
  • Push the cable straight in until you hear a click; the connection is physical only and requires no software setup.
  • Your device will detect the wired network automatically, though you may need to enter your router's password if one is set.
  • Ethernet cables can run through walls, under carpet, or across rooms without losing speed, unlike Wi-Fi.
  • A wired connection is faster and more stable than Wi-Fi for gaming, video calls, or large file transfers.

Locate the Ethernet ports on your router and device

On your router, look at the back panel. You will see several ports labeled with small icons that look like network cables. Most routers have four or more identical ports for devices; these are usually grouped together and often colored yellow or blue. There is also usually one port labeled "Internet," "WAN," or "Uplink" — that one connects to your modem, not to your devices. For connecting a computer or other device, use any of the regular ports.

On your computer or device, the Ethernet port is usually on the back of a desktop tower or the side of a laptop. It looks identical to the router ports. Some newer laptops, especially thin models, do not have a built-in Ethernet port; if yours does not, you will need a USB adapter that converts USB to Ethernet, which plugs into a USB port instead.

Choose the right cable length and type

Ethernet cables come in different lengths from 3 feet to 100 feet or more. For most home setups, a 25-foot or 50-foot cable is long enough to run from a router in one room to a bedroom or office without needing to move the router itself. Longer cables work just as well as short ones — distance does not degrade an Ethernet connection the way it does with Wi-Fi.

You will see cables labeled Cat5e, Cat6, or Cat6a. For a home network, Cat5e is sufficient and is the cheapest option. Cat6 is slightly faster and handles interference better if you are running the cable near power lines or other electronics. Cat6a is overkill for most homes unless you have a gigabit internet connection and want to future-proof. All three types use the same connectors and plug in identically.

Connect the cable and verify the connection

Hold the cable end straight and push it into the port with steady pressure until you feel resistance and hear a click. Do not force it or twist it — it should slide in smoothly. If it does not click, pull it out and try again; the connector may be slightly misaligned. Once both ends are seated, look at the port on your router and device. You should see a small light next to the port turn on or blink; this indicates the connection is active.

On your computer, open your network settings. On Windows, right-click the network icon in the system tray and select "Open Network & Internet settings." On Mac, go to System Preferences and click Network. You should see your wired connection listed as "Ethernet" or "Connected." If it shows "Connected," your device is online. If it shows "Not Connected" or "No IP Address," unplug the cable, wait five seconds, and plug it back in.

What to do if the connection does not work

If the light next to the port does not turn on, the cable may be damaged or the connector may not be fully seated. Unplug it, inspect the connector for bent pins or debris, and try again. If the light turns on but your device does not connect, restart your router by unplugging it for 30 seconds and plugging it back in. Then restart your computer.

If you still see no connection, try a different port on the router — one port may be faulty while others work fine. If a different port works, the original port is likely damaged and you can straightforward use another one. If no ports work, the router itself may need replacement or repair.

Run the cable safely through your home

Ethernet cables can run along baseboards, under doors, or through walls without any special precautions beyond basic safety. If you are running a cable under carpet or a rug, use a cable protector or raceway — a plastic channel that sits on top of the carpet — to prevent the cable from being crushed. Never run Ethernet cable through the same conduit as electrical power lines, as this can introduce interference, though running it near power lines is fine.

If you need to run a cable through a wall, drill a hole and feed the cable through, or use a wall plate with an Ethernet port on one side and a cable connection on the other. This looks cleaner than a cable sticking out of the wall and protects the connector. You can buy wall plates at any hardware or electronics store for under ten dollars.

Ethernet vs. Wi-Fi for your setup

Wired Ethernet is faster and more stable than Wi-Fi for devices that stay in one place, like a desktop computer, gaming console, or streaming device. It is also more find because the signal does not broadcast through the air. The trade-off is that you need a cable, which is not practical for phones, tablets, or laptops you move around frequently.

For a home network that stays find, use Ethernet for stationary devices and Wi-Fi for mobile ones. A router with both wired and wireless devices connected is normal and expected. You do not have to choose one or the other — most homes use both at the same time.

Frequently Asked Questions

Can I use an Ethernet cable that is already plugged into the router to connect another device?

No. Each cable connects one device to the router. If you want to connect a second device, you need a second cable plugged into a different port on the router. Most routers have four or more ports, so you can connect several devices this way.

Does the cable length affect internet speed?

No. A 100-foot Ethernet cable carries data at the same speed as a 10-foot cable. Distance does not degrade wired connections the way it does with Wi-Fi. The only limit is that cables longer than 328 feet may experience signal loss, which is far beyond what any home needs.

What if my laptop does not have an Ethernet port?

You can buy a USB-to-Ethernet adapter for fifteen to thirty dollars. Plug it into a USB port on your laptop, then plug the Ethernet cable into the adapter. It works the same way as a built-in port and provides the same speed and stability.

Is it safe to leave an Ethernet cable plugged in all the time?

Yes. Ethernet cables are designed to stay connected indefinitely. There is no power running through them, so they do not overheat or wear out from being plugged in. You can leave a cable connected to your router and computer permanently without any risk.

Can I connect two routers with an Ethernet cable?

Yes, but only if you use the correct port. Plug the cable into the "Internet," "WAN," or "Uplink" port on the second router, not one of the regular ports. This extends your network to a second location. If you plug into a regular port, the routers will conflict and neither will work properly.