Ethernet vs Wi-Fi: When Should You Use a Cable?
Wi-Fi is convenient, but a simple network cable (Ethernet) often gives a faster, more stable connection. Here's when it's worth plugging in.
Comparison
| Ethernet | Wi-Fi | |
|---|---|---|
| Speed | Full speed of your plan | Reduced by distance and walls |
| Stability | Very stable | Can drop or fluctuate |
| Ping | Lowest | Higher and variable |
| Convenience | Needs cable | Move freely |
| Security | Physical access needed | Depends on password |
When to use Ethernet
- Desktop PCs that never move.
- Gaming consoles and PCs, for lower ping. See reducing ping.
- Smart TVs streaming 4K.
- Important video calls and online exams.
- Large downloads or backups.
Choosing a cable
- Cat5e: supports up to 1 Gbps, fine for most homes.
- Cat6: better for longer runs and future speeds.
- Cat6a and above: for 10 Gbps networks.
Flat cables can run under carpets and along skirting boards neatly.
Laptop without an Ethernet port?
Many thin laptops lack Ethernet ports. A USB-C or USB-A to Ethernet adapter is inexpensive and works instantly.
Router far away?
- Use a longer cable (Ethernet works well up to 100 metres).
- Use powerline adapters through electrical wiring.
- Use a mesh system with Ethernet ports on satellite units. See mesh vs extender.
How to connect
Plug one end into a free LAN port on the router (usually yellow or numbered) and the other into your device. Windows and Mac connect automatically. You can keep Wi-Fi on; the device prefers the wired connection.
Wiring a home for Ethernet
If you're building or renovating, running network cables to key rooms is one of the best long-term investments:
- Run Cat6 cables from a central point (near the router) to the lounge TV, study/office and bedrooms.
- Install wall sockets for a neat finish.
- Consider a small network switch at the central point to connect multiple cables.
- Run cables to ceiling spots for future Wi-Fi access points or mesh units.
In existing homes, flat cables along skirting boards or powerline adapters are practical alternatives.
Ethernet troubleshooting
- No connection: check the cable clicks into place and the port light on the router blinks.
- "Unidentified network": restart the router and PC, and try another cable or port.
- Slow speed: check the link speed in Windows (Settings → Network & internet → Ethernet → properties). It should show 1 Gbps on modern hardware. A 100 Mbps link suggests a damaged cable or old port.
- Drops occasionally: replace the cable, avoid running it alongside power cables, and update network drivers.
Switches
Need more Ethernet ports? An inexpensive unmanaged gigabit switch plugs into your router and adds four or eight ports. No setup required.
Frequently asked questions
Can I use Ethernet and Wi-Fi at the same time?
Yes. Your computer will usually prefer Ethernet.
Why is my Ethernet speed limited to 100 Mbps?
A damaged or old cable, or a 100 Mbps port on the router or adapter. Try another cable and port.
Keep reading
What Is DNS? And Should You Change Your DNS Server?
DNS explained simply, how it affects speed and security, and how to switch to Cloudflare or Google DNS on your devices or router.
Keep Your Internet Running During Power Cuts: Router UPS Guide
Power your Wi-Fi router during load-shedding and power outages with a mini UPS, power bank or backup, and choose the right one.
How to See Who's on Your Wi-Fi and Kick Them Off
Find all devices connected to your Wi-Fi, identify unknown ones, and block or remove unwanted users from your network.