What Is Ethernet? A Simple Guide for Router Buyers

What Ethernet is

Ethernet is a wired networking technology used to connect computers, routers, switches, and other devices within a local network. A typical home Ethernet connection runs from a device's network port to one of the LAN ports on the back of a router through a cable designed for network traffic.

For a router buyer, Ethernet is the physical part of the network: the row of wired ports that let you connect a desktop, a switch, a game console, or another access point. The internet connection from your modem or optical network terminal often arrives on a WAN port using the same family of connections. The more wired devices you plan to connect, the more those ports matter. If you are starting from scratch, review the router ports guide before comparing models.

• LAN ports connect local devices such as computers, consoles, streaming boxes, and switches.
• A WAN port connects the router to the internet source, such as a modem or optical network terminal.
• Additional Ethernet ports on mesh satellites can be used for wired backhaul or for connecting nearby devices.

Ethernet vs Wi-Fi

Wi-Fi is the wireless counterpart to Ethernet. Wi-Fi standards are developed by the IEEE and certified by the Wi-Fi Alliance, which describes each generation of Wi-Fi, including Wi-Fi 6 and Wi-Fi 7, on its public MAC/PHY pages. Ethernet serves a similar purpose but uses physical cables instead of radio waves.

A wired Ethernet connection has practical advantages for many households. It does not depend on signal strength, wall penetration, or nearby interference the way Wi-Fi does. For fixed devices such as a home office computer, a network storage drive, or a television streaming box, running a cable can give you a more consistent connection. To understand the tradeoffs in more detail, see Ethernet vs Wi-Fi.

Ethernet ports and cables on a router

The Ethernet ports on a router are usually labeled LAN 1, LAN 2, and so on. A separate WAN port connects the router to your internet source. The number of LAN ports you need depends on how many devices you want to wire directly to the router. If you need more ports, you can connect a network switch to one LAN port and expand from there.

The cable also matters. Cables are grouped into categories that support different speeds and distances. If your router has a multi-gig port, use a cable rated for that speed class and check the port specifications before you buy. For a quick guide to matching cables and ports, read the Ethernet cable categories page and the how many Ethernet ports guide.

Router spec pages usually list the number of LAN ports, the WAN port type, and whether any ports support multi-gig speeds. Even if you plan to use Wi-Fi for most devices, having a few Ethernet ports makes the router more flexible for the devices that benefit from a wired connection.

Ethernet backhaul for mesh Wi-Fi

If you are choosing a mesh system, check whether the satellites have Ethernet ports. Some mesh systems let you connect each satellite to the main router with a cable, which is called wired Ethernet backhaul. This gives the satellite a dedicated path back to the main router and can improve consistency compared to relying only on wireless backhaul.

Not every home can run cables between rooms. In that case, choose a mesh system that handles wireless backhaul well. If you can wire the satellites, wired backhaul is usually the better choice for a stable network. Our mesh routers guide is a good starting point if you want a system that supports wired satellite connections.

Security on wired and wireless networks

Wired connections do not send data through the air the same way Wi-Fi does, but network security still depends on the router and how you manage it. If you use Wi-Fi, choose a router that supports the latest security standard, such as WPA3, which the Wi-Fi Alliance describes as simplifying Wi-Fi security and enabling more robust authentication.

NIST develops cybersecurity standards, guidelines, and best practices that organizations and individuals can use to manage risk. For a home network, simple steps include changing default credentials, keeping firmware updated, and using a strong Wi-Fi passphrase.

When Ethernet matters most

Ethernet is most useful when a device stays in one place and needs a reliable connection. Gaming consoles, desktop computers, streaming devices, and smart TVs are common candidates. If you play online games or make video calls from a fixed desk, a wired connection can reduce the number of wireless variables that affect the experience.

A wired connection is also useful for the devices that make up the network itself. A network switch, a second access point, or a mesh satellite can all use Ethernet to create a stronger overall network. If most of your devices sit in the same room as the router, a few extra LAN ports may be more valuable than the latest Wi-Fi feature.

For a more targeted look at the connection types that matter for your use, see the guides on router ports and multi-gig port routers.

What to look for when you buy

When comparing routers, check how many Ethernet ports are on the back, whether the WAN port matches your internet connection type, and whether the LAN ports support the wired speeds you expect from your devices. Router model numbers and spec pages tell you the port configuration, but the physical layout is usually visible in product photos.

If you expect to wire many devices, a router with several LAN ports or support for a switch may be enough. If you want wired mesh backhaul, confirm that each satellite has an Ethernet port. If you want high-speed wired clients, look at models with multi-gig port options. Use our multi-gig port routers and mesh routers guides to narrow the list.

What to pick for your use

Questions

Is Ethernet faster than Wi-Fi?

In many cases, yes, because a wired link does not depend on radio signal strength or interference. The exact speed depends on the router port, the cable, and the device port. If a device stays in one place, a cable is often the more reliable choice.

Do mesh routers need Ethernet backhaul?

No. Most mesh systems can connect satellites wirelessly. A wired Ethernet backhaul is optional, but it can improve consistency by giving each satellite a dedicated connection to the main router.

How many Ethernet ports do I need on a router?

Count the devices you plan to wire directly. Many routers include several LAN ports. If you need more, you can add a network switch to expand the number of wired devices.

Does the Ethernet cable matter?

Yes. Cable categories are rated for different speeds and distances. Use a cable that is rated for the speed of your router port and your device port, and keep the cable as short as you reasonably can.

Is Ethernet safer than Wi-Fi?

Ethernet does not travel through the air, but your router still controls access to the network. Use WPA3 for Wi-Fi, change default admin credentials, and update firmware to keep the whole network secure.

Can I use Ethernet and Wi-Fi on the same router?

Yes. Most routers support both at the same time. A wireless device can connect over Wi-Fi while a desktop or console uses an Ethernet port.