Router Devices.

Cisco 1800 Router
Avaya's Earth Resources 8600
Cisco 7600 Series multilayer switches

A router is a device, two or more computer networks, and selective exchange of packets between them. Each packet contains the address of a router to determine whether you can use the source and destination are on the same network, or, if the data packet to be transferred from one network to another. Where more than one router is a massive collection on the Internet, the address of the target system, routers exchange information, so that each router can build a table that shows the relationship between any two systems on the network preferred way.

Routers, network equipment is a specialized software and hardware, the routing problem and sharing information. The router has two or more network interfaces such as copper cable, fiber or a wireless network or networks of different standards, with different physical network types. Each network interface small computer dedicated from one form into electronic signals to the other.

Routers connect two or more logical subnets, do not share common network addresses. The subnet in the router does not reflect on the router 1-1 term "third-level exchange of the physical interface" are often used interchangeably with the terms "routing". Exchange term commonly used to describe the data between two network devices common forwarding address online. It is also known as the second layer of exchange or switching center.