Router is a system that ahead information packages along systems. A wireless router is linked with at least two systems, generally two LANs or WANs or a LAN and its ISPs system. Router are situated at gateways, the locations where two or more systems link.

Router use headers and sending platforms to figure out the best direction for sending the packages, and they use methods such as ICMP to link with each other and set up the best direction between any two serves.

Very little filtration of information is done through router.
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