How Routers Work

To complete the previous post about Mengenal Differences Hub, Switch, Bridge and Router, this time I will try to discuss more about Understanding Router and How Routers Work in general.

Router is a network device that is used to connect multiple networks, either on the same network or different in terms of technology such as connecting networks that use Bus, Star and Ring topologies. The router has at least 2 network interfaces. In a previous post about recognizing subneting techniques it has been suggested that connections between networks (networks with different IP subnets) can only occur with the help of the Router.

A router is a device that sends data packets over a network or the Internet to its destination, through a process known as routing. The routing process occurs in layer 3 (Network layer like Internet Protocol) from the OSI seven-layer protocol stack.

The router serves as a link between two or more networks to pass data from one network to another. Different routers with switches. Switches are connecting several tools to form a Local Area Network (LAN).

As an illustration of the difference in functionality of routers and switches is a street, and the router is a liaison between roads. Each house is on a street that has an address in a certain order. In the same way, the switch connects a variety of tools, where each tool has its own IP address on a LAN

Routers are used extensively in TCP / IP protocol-based networking, and they are also called IP routers. In addition to the IP Router, there is another AppleTalk Router, and there are still several other types of routers. The Internet is a prime example of a network that has many IP routers such as

Routers can be used to connect multiple small networks to a larger network, called an internetwork, or to divide a large network into multiple subnetworks to improve performance and also simplify management. Routers are also sometimes used to connect two networks that use different media (such as wireless routers that in general other than he can connect a computer by using radio, it also supports UTP cable connections), or different network architectures, as well as from Ethernet To the Token Ring.


The main function of the Router is to route packets (information). A Router has Routing capability, meaning the Router can intelligently know where the information route (packet) is going to be passed, whether it is for another host on a network or on a different network.

If packets are intended for hosts on other networks then the router will forward them to the network. Conversely, if the packets are intended to host a single network then the router will block out packets.