A router allows for internetwork communication.
You can also use a switch implementing VLANs, STP, and VTP. But this method is rather tedious because you have to configure each used port on each switch.
I would go into a full description, but if I did, I would be here for 3 days.
A Router for the consumer type networks.
DSL/Cable modem to Router then everything else connects to Router---computers, printers, BlueRay players, HDTV, etc. The Router is in charge of distributing everything to where it needs to go.
an iphone and some common sense.
Media is always required to connect one device to another on a network. It doesn't matter if it is a client server network or a peer to peer network.
One device that is shared on the network is a router. This is the one that will connect the various devices to the shared network.
Router.
Router
The Wireless Network Adapter WUSB300N is a device that lets you connect your laptop to the Internet. It is plugged into a USB port and will connect you by tapping into the nearest Internet signal.
A LAN (a local area network )
Specialized Device for exchanging data amongst class based Networks & Subnetted (multiple parts of one network) is Router.
The device that connects one network to another is Router or Multilayer Switches but by default multilayer switches will not enable the services connecting two different network we should provide instruction through CLI.
In an ordinary wireless network there are hubs set up specifically for connecting the wireless devices to the larger (wired) network. In a cooperative network, a device that can't reach a hub might talk to another device that can, and the second device would pass along the network traffic. It's similar to one cell phone that can't reach a cell tower talking directly to another cell phone and letting that other cell phone connect it to the tower. (cell phones don't actually do this)
What one computer can do is tell you if another device is connected to the same network and is switched on. If a computer has been connected to a network and the network administrator has electronically asked who's connected and what are you doing then more detailed information is collected.
A switch box
Bridge mode allows to connect to geographically separate piece of the same network together. For instance you have one piece of the network in one building and another one in another building. You can't use a cable to connect them together. In such situation you might have to use a bridge.