D.Kartheek murugan

outlineWhat is a VPN?Types of VPNWhy use VPNs?Types of VPN protocolsEncryptionDisadvantage 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 VPNsRemote Access VPNProvides access to internal corporate network over the Internet.Reduces long distance, modem bank, and technical support costs.

Types of VPNsRemote Access VPNSite-to-Site VPNConnects multiple offices over Internet

Reduces dependencies on frame relay and leased lines

Types of VPNsRemote Access VPNSite-to-Site VPNExtranet VPN

Provides business partners access to critical information (leads, sales tools, etc)

Reduces transaction and operational costs

Types of VPNsRemote Access VPN

Site-to-Site VPNExtranet VPNIntranet 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)

EncryptionUsed to convert data to a secret code for transmission over an trusted network

EncryptionAlgorithmThe cow jumped over the moon4hsd4e3mjvd3sda1d38esdf2w4dClear TextEncrypted Text

Symmetric EncryptionSame key used to encrypt and decrypt messageFaster than asymmetric encryptionUsed by IPSec to encrypt actual message dataExamples: DES, 3DES, RC5

Asymmetric EncryptionDifferent keys used to encrypt and decrypt message (One public, one private)Provides non-repudiation of message or message integrityExamples include RSA, DSA, SHA-1, MD-5

Disadvantages of VPNLower bandwidth available compared to dial-in lineInconsistent remote access performance due to changes in Internet connectivity No entrance into the network if the Internet connection is broken

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