Router

Router is a networking tool that sends data packets through a network or the Internet to the destination, through a process known as routing. The process of routing occurs at layer 3 (network layer such as the Internet Protocol) of the protocol stack of seven-layer OSI.

Function

Router serves as a liaison between two or more networks to carry data from one network to another network. Different router switch. Switch is connecting several devices to form a Local Area Network (LAN).
Analogy Router and Switch

As an illustration of the different functions of routers and switches is a street, and the router is the liaison between the road. Each house is on the road that has an address in a particular order. In the same way, the switch connects various devices, where each instrument has its own IP address on a LAN.

Router is very widely used in technology-based network TCP / IP, and router types that are also called IP Router. In addition to IP router, there is another AppleTalk router, and still there are several other types of routers. The Internet is a prime example of a network that has a lot of IP routers. Router can be used to connect many small networks into a larger network, called the internetwork, or to divide a large network into several subnetworks to improve performance and simplify management. Router is also sometimes used to mengoneksikan two networks that use different media (such as wireless routers in general than he can connect computers using radio, he also supports connecting computers with UTP cable), or different network architectures, such as the Ethernet to Token Ring.

Router can also be used to connect LANs to a telecommunications service such as leased line telecommunications or Digital Subscriber Line (DSL). Router used to connect LANs to a leased line connection such as T1, or T3, often referred to as access servers. Meanwhile, the router used to connect local network to a DSL connection is also a DSL router. Type routers generally have a firewall function to perform packet filtering based on source address and destination address of the package, although some routers do not have it. Router that has a feature called packet filtering with packet-filtering routers. Router blocking traffic is generally transmitted data is broadcast in order to prevent the broadcast storm that could slow down network performan