Virtual Private Network 2003
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Transcript of Virtual Private Network 2003
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D.Kartheek murugan
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outlineWhat is a VPN?Types of VPNWhy use VPNs?Types of VPN protocolsEncryptionDisadvantage of VPN
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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
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Types of VPNsRemote Access VPNProvides access to internal corporate network over the Internet.Reduces long distance, modem bank, and technical support costs.
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Types of VPNsRemote Access VPNSite-to-Site VPNConnects multiple offices over Internet
Reduces dependencies on frame relay and leased lines
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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
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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.
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Why Use Virtual Private Networks? More flexibility More scalability Lower costs
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Point-to-Point Tunneling Protocol (PPTP)Layer 2 Tunneling Protocol (L2TP)
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EncryptionUsed to convert data to a secret code for transmission over an trusted network
EncryptionAlgorithmThe cow jumped over the moon4hsd4e3mjvd3sda1d38esdf2w4dClear TextEncrypted Text
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Symmetric EncryptionSame key used to encrypt and decrypt messageFaster than asymmetric encryptionUsed by IPSec to encrypt actual message dataExamples: DES, 3DES, RC5
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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
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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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Thank you