What is VPN ?
Virtual Private Network is a type of private network
that uses public telecommunication, such as the
Internet, instead of leased lines to communicate.
Became popular as more employees worked in remote
Terminologies to understand how VPNs work.
5. VIRTUAL PRIVATE NETWORK
Employees can access the network
(Intranet) from remote locations.
The Internet is used as the backbone for
Saves cost tremendously from reduction of
equipment and maintenance costs.
“A Virtual Private Network (VPN) is a
network constructed over the Internet and
other existing networks, that allows easy
and secure data transfers between the
7. HOW IT WORKS ?
Two connections – one is made to the Internet and the
second is made to the VPN.
Datagrams – contains data, destination and source
Firewalls – VPNs allow authorized users to pass through
Protocols – protocols create the VPN tunnels.
10. FOUR PROTOCOLS IN VPN
PPTP -- Point-to-Point Tunneling Protocol.
L2TP -- Layer 2 Tunneling Protocol.
IPsec -- Internet Protocol Security.
SOCKS – is not used as much as the ones above
11. FOUR CRITICAL FUNCTION
Authentication – validates that the data was sent from
the authorized sender
Access control – give access to only authorized users.
Confidentiality – preventing the data to be read or
copied as the data is being transported.
Data Integrity – maintaining and assuring the accuracy
and consistency of data.
12. VPN TECHNOLOGIES
1 : Trusted VPN
Provide assurance of properties of paths such as QoS.
2 : Secure VPN
No assurance of paths.
3 : Hybrid VPN
Provide Secure and Trusted VPNs.
Company already have Trusted VPN and need Security.
13. APPLICATION : REMOTE ACCESS
Secure connection – own computer to VPN router.
Easily access email, data, files at work from
outside through Internet.
VPN allows mobile workers & telecommuters to
take advantage of broadband connectivity.
15. APPLICATION : SITE-TO-SITE
Data is encrypted from one VPN gateway to other
by secure link between two sites over internet.
This would enable both sites to share resources –
documents, other data over VPN link.
This saves the company hardware and
Eliminating the need for expensive long-
distance leased lines
Reducing the long-distance telephone
charges for remote access.
data integrity and privacy is achieved.
Reduced Operational costs.
Flexibility of growth .
VPNs require an in-depth understanding of
public network, security issues and proper
deployment of precautions.
VPNs need to accommodate protocols other
than IP and existing internal network
21. Where Do We See VPNs Going in
As the VPN market becomes larger, more applications
will be created along with more VPN providers and new
Networks are expected to converge to create an
Improvement of protocols are expected, which will also
VPNs allow users to connect to remote
servers, branch offices, or to other
companies over a public
internetwork, while maintaining secure
A VPN, only requires a broadband