What Is a Router? Router Definition and Functions
Routers are an essential part of Internet access. Though they don't connect directly to the Internet, they are important for a widespread Internet connection across multiple devices. In this article, learn what a router is by definition. You'll also learn how it operates, the kinds of network routers available, and more.
What is a router?
A router is a network device that connects multiple computer networks and forwards data packets between them using Internet Protocol (IP). Acting like an Internet traffic controller, it uses routing tables and protocols such as TCP/IP to ensure data reaches the right destination.
Some models include built-in wireless access points, making them wireless routers, but not all routers are wireless. A router works at the boundary between networks, such as a local area network (LAN) and the wider Internet. Each interface on a router has its own MAC address and an IP address.
What does a router do?
Routers are essential to network connections for anyone who wants to go online. They connect computer networks to one another, allowing communication and data packet sharing. Routers also provide the following functions:
- Traffic routing between LANs, WANs, and the Internet
- Network address translation (NAT) to share one public IP on multiple devices
- DHCP services to auto-assign IPs to local devices
- Built-in security that includes firewalls, content filtering, and VPN handling
- Wireless access point capability to support wireless devices
Furthermore, they connect the modem to other devices in your home or local network. This allows them to communicate with each other and the Internet on a WiFi network.
For local area networks (LANs) they often include a Dynamic Host Configuration Protocol (DHCP) service to assign private IP addresses to devices automatically. Routers connect your home network to your Internet service provider (ISP). many can be managed using databases such as management information bases.
Routers give out these private IP addresses to things like phones or computers on the LAN. Doing so helps prevent IP address conflict and allows for smooth communication.
What are the different types of routers?
We use multiple kinds of routers in various ways to distribute WiFi and share connections. There are five main types on the market today: wired, wireless, core, edge, and virtual.
Wired routers
As the name implies, wired routers connect devices via a cable plugged into their LAN Ethernet ports. It connects directly to each device and then to the modem, which allows them to access the Internet.
They typically have multiple LAN Ethernet ports in the back, which lets several computing machines connect simultaneously.
Wireless routers
If you think of WiFi when you think of a router, you're thinking of wireless or WiFi routers. But what exactly is a wireless router? They combine a traditional router with a built-in WiFi access point. It uses radio frequencies to connect local wireless devices to the same network while linking the network to the Internet through a wired connection to the modem.
Like the wired version, this router allows multiple devices to connect at once. The difference is that it uses a digital password instead of a physical wired connection.
Though several different kinds of routers exist, we can categorize almost all of them as either wired or wireless.
Edge routers
Edge routers stay at the boundary, or edge, of a wireless network you control. As a part of edge computing, they allow you to connect it to a network that you don't. It often connects a local area network - like your home network - to a wide area network, like the Internet.
They distribute packets and control communication across several networks at once. Edge WLAN devices can be either wired or wireless, depending on the network's design.
Core routers
Whereas edge routers navigate communication between multiple networks, core routers work within only one network. However, that network is a wide area network and a core network like the Internet. They don't operate within smaller local area networks.
Core routers are fast and capable. They forward IP packets across a network to increase speeds and routing capabilities. They can also be wired or wireless.
Virtual routers
Virtual routers are software routers. They let a computer or machine to perform the same role as a hardware router. They allow control over multiple networks on one interface as opposed to a physical router. Physical devices can also support multiple networks per interface, but virtual routers make this easier to scale.
They work in LANs, performing the same packet routing and network connection as a standard hardware router would. Unlike most other types, virtual routers are neither wired nor wireless. They aren't physical devices with wiring capabilities.
How does a router work?
A router connects multiple networks together by routing data packets between them. They receive incoming data packets. Essentially, they serve as a dispatcher to choose the best route for your information and data packets to take.
Once it receives data, the router analyzes the data's header to determine where the information should go. It uses routing tables and other tools, like network address translation, to manage computing machines and networks simultaneously.
Understanding routing tables and routing protocols
As routers transfer data and send data packets across networks, they need guidelines to follow. Using such guidelines ensures the data arrives at its intended location. Therefore, routers need routing tables and protocols to establish proper procedure and paths.
A routing table is a set of rules for routers. It determines where a routing device should direct data packets over a network. These tables store the source and destination IPs of computing machines.
A router checks its routing table to find the IP address of the destination machine when a data packet is sent to another host. Each routing table may vary in terms of its information. But all routing tables include a destination, subnet mask, gateway, interface, and routes.
Common routing protocols
Routers also employ various routing protocols to distribute information across paths on a network. A few of the most common protocols include:
- Routing Information Protocol (RIP). This dynamic routing protocol uses hop count to find the most direct path between the source and destination network.
- Open Shortest Path First (OSPF). This is a link-state protocol based on another algorithm, the Shortest Path First (SPF) algorithm. It uses this algorithm to route IP packets on IP networks.
- Interior Gateway Routing Protocol (IGRP). This protocol allows routers to share routing information within a system under a single administrative domain.
- Exterior Gateway Protocol (EGP). Like IGRP, EGP allows routers to share routing information between different autonomous systems on the Internet, though it is largely replaced by the modern Border Gateway Protocol (BGP)
- Intermediate System to Intermediate System (IS-IS). IS-IS is a link-state routing protocol similar to OSPF. It transmits information within a computer network without requiring IP connectivity.
When selecting a routing protocol, consider the size and topology of your network. Certain protocols may be better suited to your network needs. When you choose the protocol you want to use, you can then configure your router to use it in data exchange.
You can see routing in action by running a simple traceroute command; it shows each router hop your data takes across the Internet.
What is the purpose of a router?
A router connects computer networks, allowing data to route seamlessly between them. It manages traffic flow between networks and breaks down large networks into smaller, more manageable segments. It also performs network address translation (NAT) to allow for public IP sharing.
Do I need a router for WiFi?
Despite popular belief, these two are not the same. Therefore, users may ask - how does a router work with WiFi?
Routers are essential if you want to share a WiFi connection with more than one WiFi device. But you technically don't need one for WiFi if you're using a single, wired device connected directly to your modem. The modem provides your Internet link, while a router distributes that connection to multiple devices through your local network.
If you have one computer that needs to access the Internet, you can use an Ethernet cable to plug into the modem only. You will still be able to access what you need.
However, most people find a router necessary for their household, especially if they have a large home. It allows for functioning WiFi systems. It also lets multiple devices communicate with each other and with the Internet through the modem connection.
When choosing a router, look for features like dual or tri-band WiFi 6, QoS (Quality of Service), and mesh network support for larger homes. For security, prioritize routers with WPA3, automatic firmware updates, and options to disable WPS and remote access. Guest network capabilities add further protection.
What is the difference between a router and a modem?
Routers and modems work together to establish the best service with the fastest speeds possible. They are necessary to manage local area networks. The modem provides your network's link to your Internet service provider (ISP), while the router distributes that connection among devices on your local network. Without a modem, you can't access the wider Internet.
Many companies sell router-modem combination units, which makes figuring out device connections easier if you lack technical knowledge. However, these gateway units can be less flexible or powerful than separate dedicated devices, especially when it comes to WiFi range, firmware control, and advanced features.
If you obtain your WiFi from an ISP, the unit or units they provide will suffice for your connection. However, some users prefer to purchase their own routers for superior service.
Benefits of routers
While most people use a router to facilitate network communication, you have other options. You can use a modem or switch. You can also use a mobile WiFi hotspot to access the Internet instead. However, routers do offer several benefits to users, such as,
- Improved network performance
- Ability to scale size
- Enhanced network security
- The ability to enable remote access and set up VPNs
- Ease of communication between different networks
- Better network management and traffic control
- Consistent speeds for multiple devices
Using a router to facilitate your network connections can benefit all users on your network. It helps them exchange data and perform online tasks. Many modern routers also include features like QoS (Quality of Service) and MU-MIMO technology, which helps manage bandwidth more efficiently when multiple people are streaming, gaming, or working online at the same time.
What is my router's IP address?
To configure your router or its settings, you need its IP address for the router login. Though this varies by machine, you can easily find the IP address by locating your default gateway. Try using the ipconfig command or checking your device's settings, depending on the machine.
Once you learn how to find your default gateway address, you'll know the IP. In many cases, your router's IP address is also your public IP address which can be seen on the What Is My IP homepage. Note, though, that you can also change your IP address using certain methods, such as reconnecting to your ISP or using a VPN or proxy. Once you have your public IP, use it to log on to your device and change your password or username, change your SSID, and more.
Frequently asked questions
Do you need a router and a modem?
You need both if you want to connect multiple devices to the Internet at the same time. You also need them if you want to connect any device wirelessly. A router can't connect on its own; it needs a modem to communicate with your ISP. A modem can connect a single device with a wired connection to the Internet, but it needs a router to share that connection or enable WiFi.
What is the difference between a router and a gateway?
Both serve to connect multiple networks together. A gateway connects a single local area network to the Internet or another network. A router, on the other hand, connects multiple networks together.
What is WPS on a router?
WPS stands for WiFi Protected Setup. It's a feature on many routers that makes it easy to connect devices securely. If you see a WPS button on the back of your router, you can press it.
This allows you to connect a device quickly rather than entering your WiFi password. Press the button, and it will seek out compatible devices. It should connect automatically, much like how a Bluetooth connection works.
What is a mesh router?
A mesh router is part of a mesh network. It links several access points across a space to improve a WiFi connection. A single router only reaches so far. But mesh routers and mesh networks have a stronger connection across a greater distance.
What is a router used for?
It manages traffic across a network via data packet transfer. It also allows more than one device to access the Internet at once on the same network. Furthermore, it assigns IP addresses, like an ISP, to devices on a LAN.
Are routers wired or wireless?
Both wired and wireless types exist. Which you use depends on your network needs.
Can a router be used as a switch?
In some situations, yes. While a router's primary function is routing network traffic, it can help connect devices on that network like a switch would.
