1. Virtual Private Network (VPN)
D.Kartheek murugan

2. outline What is a VPN? Types of VPN Why use VPNs?
Types of VPN protocols
Encryption
Disadvantage of VPN

3. What is a VPN?
A VPN is A network that uses Internet or other network service to transmit data.
A VPN includes authentication and encryption to protect data integrity and confidentiality

4. Types of VPNs Remote Access VPN
Provides access to internal corporate network over the Internet.
Reduces long distance, modem bank, and technical support costs.

5. Types of VPNs Site-to-Site VPN Remote Access VPN
Connects multiple offices over Internet
Reduces dependencies on frame relay and leased lines

6. Types of VPNs Remote Access VPN Site-to-Site VPN Extranet VPN
Provides business partners access to critical information (leads, sales tools, etc)
Reduces transaction and operational costs

7. Types of VPNs Extranet VPN Intranet VPN: Remote Access VPN
Site-to-Site VPN
Extranet VPN
Intranet VPN:
Links corporate headquarters, remote offices, and branch offices over a shared infrastructure using dedicated connections.

8. Why Use Virtual Private Networks?
More flexibility
More scalability
Lower costs

9. Point-to-Point Tunneling Protocol (PPTP)
Layer 2 Tunneling Protocol (L2TP)

10. Encryption
Used to convert data to a secret code for transmission over an trusted network
Encrypted Text
Clear Text
Encryption
Algorithm
“The cow jumped
over the moon”
“4hsd4e3mjvd3sd
a1d38esdf2w4d”

11. Symmetric Encryption Same key used to encrypt and decrypt message
Faster than asymmetric encryption
Used by IPSec to encrypt actual message data
Examples: DES, 3DES, RC5

12. Asymmetric Encryption
Different keys used to encrypt and decrypt message (One public, one private)
Provides non-repudiation of message or message integrity
Examples include RSA, DSA, SHA-1, MD-5

13. Disadvantages of VPN
Lower bandwidth available compared to dial-in line
Inconsistent remote access performance due to changes in Internet connectivity
No entrance into the network if the Internet connection is broken

14. Thank you