What is a wide area network (WAN)? What is a wide area network (Wan) device?


Intersect multiple local area networks (LAN). A LAN is usually a collection of computers and network devices that are related to each other from a relatively short geographical distance. In a company or business, the WAN consists of the impact on corporate headquarters, branches, deployment facilities, cloud services, and other facilities. Normally, a router or other multifunction device is used to connect the LAN to the WAN.

 The WAN initiative allows users to share access to applications, services, and other centrally located properties. For example, you must remove and install the same application server, firewall or another resource in multiple locations.

The WAN is not restricted to the same geographic location as the LAN. A LAN can consist of any number of geographic areas and can be connected to WAN devices. In other words, the WAN is not restricted to a specific location.


There are network devices designed specifically for LAN interconnection. The configuration, installation, and maintenance of this device requires the experience of the network management professionals of an organization. These devices are specific to WAN environments and include:

Modem

A modem allows you to send digital data through analog media while sending and receiving information.

Voice band modems can convert digital signals (1 and 0) generated by a computer into audio frequencies and send them through an analog line in a telephone network. On the other side of the connection, another modem converts the sound into a digital signal that enters the computer or network connection.

CSU / DSU
A channel service unit/data service unit CSU / DSU is a combination of equipment used to monitor the line clock and frame synchronization. It also detects errors in the physical layer. This can be called a modem type.

Access server

Centralize user input and output communication. Access the server can have a combination of analog and digital interfaces that support hundreds of concurrent users.

WAN switch

Multiport interconnection devices used in operator networks. These devices generally change traffic as ATM and operate at the data link layer of the OSI reference model. Switched public telephone network switches can also be used in the cloud for circuit switching connections, such as the Integrated Services Digital Network (ISDN) and analog telephone access.

Router
The router provides WAN access interface ports that are used to interconnect LAN networks and connect to service provider networks. These interfaces are serial connections or other WAN interfaces. Some types of WAN interfaces require an external device such as a DSU / CSU or a modem (analog, cable, DSL) to connect the router to the local presence point (POP) of the service provider.

Central router

A router in the center or the WAN backbone, not the WAN. To achieve this functionality, the router must be able to support the higher-speed communication interfaces used in the WAN core and all those interfaces must be able to forward IP packets at full speed. The router must also support the routing protocol used by the kernel.


Comments

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