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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 VPNs
Remote Access VPNProvides access to internal corporate
network over the Internet.Reduces long distance, modem bank,
and technical support costs.
Types of VPNsRemote Access VPN
Site-to-Site VPNConnects multiple offices over
Internet
Reduces dependencies on frame relay and leased lines
Types of VPNsRemote Access VPNSite-to-Site VPN
Extranet 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)
Encryption
Used to convert data to a secret code for transmission over an trusted network
EncryptionAlgorithm
“The cow jumped over the moon”
“4hsd4e3mjvd3sda1d38esdf2w4d”
Clear TextClear Text Encrypted TextEncrypted Text
Symmetric Encryption
Same key used to encrypt and decrypt message
Faster than asymmetric encryptionUsed by IPSec to encrypt actual
message dataExamples: 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 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
Thank you