05-12-2012, 01:32 PM
Virtual Private Network (VPN)
Virtual Private.ppt (Size: 1.83 MB / Downloads: 34)
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
Types of VPNs
Remote Access VPN
Provides access to internal corporate network over the Internet.
Reduces long distance, modem bank, and technical support costs.
Why Use Virtual Private Networks?
More flexibility
Use multiple connection types (cable, DSL, T1, T3)
Secure and low-cost way to link
Ubiquitous ISP services
Easier E-commerce
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
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
Industries That May Use a VPN
Healthcare: enables the transferring of confidential patient information within the medical facilities & health care provider
Manufacturing: allow suppliers to view inventory & allow clients to purchase online safely
Retail: able to securely transfer sales data or customer info between stores & the headquarters
Banking/Financial: enables account information to be transferred safely within departments & branches
General Business: communication between remote employees can be securely exchanged