Internet router is an essential one of network devices, routers, is a segment to connect multiple networks or network equipment, it can be between different networks or data segment to "translate"to make them To each other, "read"to understand each other's data, so as to constitute a larger network. A typical router has two major functions, namely, data path functions and control functions. Data path functions, including forwarding decision, forwarding the backplane and output link scheduling, usually done by a specific hardware; control functions typically implemented in software, including the exchange of information between adjacent routers, system configuration, system management, etc. .
To explain the concept of a router, the first to introduce what is routing. The so-called "routing"refers to data from one place to another place behavior and action, and the router, it is the implementation of this action machine behavior, which the English name for the Router. The basic function of the router as follows:
First, the network interconnection: router supports a variety of LAN and WAN interfaces, mainly for the interconnection of local area network and wide area networks, different network communicate with each other;
Second, the data processing: including packet filtering, packet forwarding, priority, multiplexing, encryption, compression, and firewall functions;
Third, the network management: routers, including router configuration management, performance management, fault management and flow control.