Virtual Private Network (VPN) D.Kartheek murugan

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

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.

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

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

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.

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

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

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”

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

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

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

Thank you