Intersects multiple local area networks (LANs). A LAN is
usually a collection of computers and network devices that are associated with
each other from a comparatively short geographical distance. In a company or
business, a WAN can consist of influences to the company's headquarters,
branches, deployment facilities, cloud services, and other facilities. Usually,
a router or other multifunction device is used to connect the LAN to the WAN.
An initiative WAN allows users to share access to centrally located
applications, services, and other properties.
This needs to removes & install the same application server,
firewall, or other resources in multiple locations, for example.
The WAN is not restricted to the same geographic location as
the LAN. LANs can be configured in any number of geographic areas and connected
to WAN devices. In other words, the WAN is not restricted to a specific
location.
There are network devices specially designed for LAN
interconnection. The configuration, installation, and maintenance of this
device require the experience of an expert engineer in the administration of
your organization's network. These devices are specific to WAN environments and
include:
Modems
With a modem, you can send digital data through analog media
while sending and receiving
information.
Voice band modems convert digital signals (1 and 0)
generated by a computer into voice frequencies that can be transmitted through
analog lines in the telephone network. On the other side of the connection,
another modem converts the sound into a digital signal for input to a computer
or network connection.
CSU/DSU
A channel service unit/data service unit CSU / DSU is a
combination of equipment used for line clock and frame synchronization
monitoring. It also detects errors in the physical layer. This can be called a
kind of modem.
Access server
Centralize user input and output communications. Access
servers can have a combination of analog and digital interfaces, which support
hundreds of concurrent users.
WAN Switch
Multiport interconnection devices used in operator networks.
These devices usually 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.
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 external devices such as DSU / CSU and modems (analog,
cable, DSL) to connect the router to the local presence point (POP) of the
service provider.
Core Router
A router in the center or the WAN backbone, not the WAN. To
fulfill this function, the router must be able to support the highest speed
communication interfaces in use 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 in the kernel.
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