1. University of Mysore
Department of Library and information science
Seminar on : “Wide Area Network”
Presented To:
Dr.Chandrashakara, M.
Professor.
Presented By :
Shanthakumara,T.N.

2. INTRODUCTION
WAN is a network that spans large
geographical locations, usually to
interconnect multiple Local Area
Networks (LANs). The practical
definition of a WAN is a network
that traverses a public network or
commercial carrier, using one of
several WAN technologies.

3. A wide area network (WAN )
WAN is a network that covers a
broad area i.e., any
telecommunications network that
links across metropolitan, regional,
or national boundaries using private
or public network transports.
Business and government entities
utilize WANs to relay data among
employees, clients, buyers, and
suppliers from various geographical
locations.

4. In essence, this mode of
telecommunication allows a
business to effectively carry out its
daily function regardless of location.
The Internet can be considered a
WAN as well, and is used by
businesses, governments,
organizations, and individuals for
almost any purpose imaginable

6. WAN Connection Types
WANs are generally grouped
into three separate connection
types:
• Point-to-Point technologies
• Circuit-switched technologies
• Packet-switched technologies

7. Point-to-Point technologies
Are usually the most expensive form of WAN
technology. Point-to-Point technologies are
leased from a service provider, and provide
Guaranteed bandwidth from location to
Another.
Examples of point-to-point technologies
include:
• T1 lines
• T3 lines

8. a point-to-point connection refers to a
communications connection between
two nodes or endpoints. An example is
a telephone call, in which one
telephone is connected with one
other, and what is said by one caller
can only be heard by the other.

9. Circuit-Switched technologies
Circuit-Switched technologies require
call-setup to occur before information
can be transferred. The session is
usually torn down once data transfer
is complete. Circuits witched lines are
generally low-speed compared to
point-to-point lines.
Examples of circuit-switched
technologies include:
• Dial-up
• ISDN (Integrated service for Digital
Network)

10. In a typical network, a number of nodes,
or endpoints, are linked with a network
of interconnected switches. The salient
feature of circuit switched networks is
that a fixed connection, or circuit, is
established between two nodes that
wish to communicate. This connection
provides a constant amount of
bandwidth for the transmission of data.
Connections are set up in several steps.

11. First, the calling device indicates its desire to
establish a connection with a particular
remote node. Each switch along the path
through the network from the sending node to
the receiving node is notified of the
connection request and reserves the resources
necessary to handle the connection. Once the
remote node accepts the request, the end-to-
end circuit is established exclusively for
communication between these two nodes.

12. Packet-Switched technologies
Packet-Switched technologies share a
common infrastructure between all the
provider’s subscribers. Packet-switched
technologies are ill-suited for applications
that require consistent bandwidth, but are
considerably less expensive than dedicated
point-to-point lines.
Examples of packet-switched technologies
include:
• Frame-Relay
• X25

13. Cont…
This is the second alternative is a packet switched
network. This network can only handle digital data,
which is fragmented into discrete packets of
information.
Each packet contains an address header
with complete information about its source and
destination nodes. A source node emits packets of
data, which are then processed by every switch along
the path to the destination nodes. The packets are
each processed individually; the network maintains
no "connections" between nodes.

14. Conclusion
Thus, a computer network that spans a
relatively large geographical area.
Typically, a WAN consists of two or more
local-area networks (LANs).
Computers connected to a wide-area
network are often connected through
public networks, such as the telephone
system. They can also be connected
through leased lines or satellites. The
largest WAN in existence is the Internet.