VIRTUAL PRIVATE NETWORKS

volleyballbeginnerNetworking and Communications

Oct 27, 2013 (4 years and 11 days ago)

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VIRTUAL PRIVATE NETWORKS

PRASHANTH KUMAR MUTHOJU

Why VPN ?


Internet


openness



Privacy

What is VPN?


Private network using public
connectors


from
www.howstuffworks.com


Used for:


Remote Access


Employees


Intranet


Branch offices


Extranet


Organization
-

Customer

How VPN works?


Tunneling


Point
-
to
-
Point Protocol (PPP)


from
www.microsoft.com/technet



Tunneling


Carrier Protocol


The protocol used by the network


Encapsulating Protocol


The protocol (GRE, IPSec, L2F,
PPTP, L2TP) that is wrapped
around the original data


Passenger Protocol


The original data (IPX, NetBeui, IP)
being carried

Point
-
to
-
Point Protocol (PPP)


Phase 1: PPP Link Establishment


Phase 2: User Authentication


Phase 3: PPP Callback Control


Phase 4: Invoking Network Layer Protocol(s)

Point
-
to
-
Point Tunneling
Protocol (PPTP)


from
www.microsoft.com/technet



VPN provides:


User Authentication



Token card support



Dynamic address assignment



Data compression



Data encryption



Key Management



Multiprotocol support


Security measures in VPN


Firewalls


Encryption


Symmetric
-
key encryption


Public
-
key encryption


Certificates

Conclusion


VPNs allow users or corporations
to connect to remote servers,
branch offices, or to other
companies over a public
internetwork, while maintaining
secure communications.