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