Virtual Private Network (VPN)

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Virtual Private Network (VPN)
D.Kartheek murugan
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outline

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

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

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Types of VPNs

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

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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

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Types of VPNs

• 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.

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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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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
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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

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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

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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

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Thank you