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.
Router.
A router is a device that will allow different networks to communicate with each other.
DSLAM
Ring - A ringtopology connects neighboring nodes until they form a ring. Signals travel in one direction around the ring. In ring topologies, each device on the network acts as a repeater to send the signal to the next device
Router
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 B-to-B network is known as a extranet. It connects one business to another via a direct line. This allows a confidential network to be established for internal communication.
DSLAM
Wi-Fi
Topology is the structure that describes how devices in a Network are connected.Bus Topology: Directly connects all devices to network i.e utilises a single Physical medium for Data transmission between devices.Star Topology: Connects all devices in network through a Central Network connecting device such as Hubs & Switches.Advantage of Bus Topology is that less connecting cable is used.Advantage of Star Topology is that Network can function in case one or more devices fail.Disadvantage of Bus Topology is that whole Network goes down if one device fails.Disadvantage of Star Topology is that it requires physical connecting medium from Central device to the connecting device i.e more expensive.
extranet
A network is ANY connection of computers or other devices.Companies can have company-spanning networks; similarly, you can connect two or more computers at your home. A while ago, such networks were normally NOT connected to the Internet; the networks were set up to share resources such as printers, file servers, etc. Even today, every company and home that connects computers has its own network - thus, the Internet can be considered as a "network of networks", i.e., smaller networks, connected into a larger one. Often, the boundary between one network and another one is considered to be the router or equivalent device. Thus, the ADSL device I use at home, to connect to the Internet, connects three different networks: * An Ethernet network (which uses cables) * A Wi-Fi network (the wireless network) * The ADSL network (the connection to the ISP).