2. In the present era all organizations want easy
connectivity to their customers. To make this
connection internet plays an important role. It
provides the platform where the organizations and
its customers can connect and interact5 with each
other.
3. The other common requirement of organizations is
connectivity between their branches. For this there are
two options, dedicated leased line or broadband
connection. Broadband internet connection is generally
preferred for this over leased lines as it is much cheaper.
When we are using internet, we are basically using a
public network and getting connected to everyone who is
already on internet. This is good as well as bad. Good
because it gives easy access for customers, but at the
same time it is bad as it opens up ways for people who
want to steal sensitive and important information of the
organization.
4. So as an engineer you will have to obtain two
things:-
1. Connectivity between branches
2. Connectivity with the world
To secure the data transmission between
branches over internet we use Virtual Private
Network (VPN). The data is sent in the form so that
only the desired party can understand it. At the same
time it is also ensured that it does not get altered mid
way.
5. Virtual Private Network (VPN)
VPN can be categorized in many types based on the
solutions, implementations or requirements. In this
chapter VPN will be categorized and explained in
two ways:-
1. Based on Layered Approach of OSI or
TCP/IP
2. Based on Protocols
