![]() More sophisticated devices use application-specific integrated circuits (ASICs) to increase performance or add advanced filtering and firewall functionality. Early routers used software-based forwarding, running on a CPU. Routers can be built from standard computer parts but are mostly specialized purpose-built computers. More sophisticated routers, such as enterprise routers, connect large business or ISP networks up to the powerful core routers that forward data at high speed along the optical fiber lines of the Internet backbone. ![]() The most familiar type of IP routers are home and small office routers that simply forward IP packets between the home computers and the Internet. Then, using information in its routing table or routing policy, it directs the packet to the next network on its journey. When a data packet comes in on one of the lines, the router reads the network address information in the packet header to determine the ultimate destination. Ī router is connected to two or more data lines from different IP networks. the Internet) until it reaches its destination node. A packet is typically forwarded from one router to another router through the networks that constitute an internetwork (e.g. Data sent through a network, such as a web page or email, is in the form of data packets. ![]() ![]() Routers perform the traffic directing functions between networks and on the global Internet. ![]() A router is a networking device that forwards data packets between computer networks. ![]()
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