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VPN

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Virtual Private Network

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VPN

  1. 1. VIRTUAL PRIVATEVIRTUAL PRIVATE NETWORKS (VPN)NETWORKS (VPN) BY:BY: JAYDEEP GHAGHADAJAYDEEP GHAGHADA 146020307515146020307515
  2. 2. Traditional ConnectivityTraditional Connectivity [From Gartner Consulting][From Gartner Consulting]
  3. 3. What is VPN?What is VPN? Virtual Private Network is a type of privateVirtual Private Network is a type of private network that uses public telecommunication,network that uses public telecommunication, such as the Internet, instead of leased lines tosuch as the Internet, instead of leased lines to communicate.communicate. Became popular as more employees worked inBecame popular as more employees worked in remote locations.remote locations.
  4. 4. How are VPN better than PrivateHow are VPN better than Private Networks.Networks. Employees can access the network (Intranet)Employees can access the network (Intranet) from remote locations.from remote locations. Secured networks.Secured networks. The Internet is used as the backbone for VPNsThe Internet is used as the backbone for VPNs Saves cost tremendously from reduction ofSaves cost tremendously from reduction of equipment and maintenance costs.equipment and maintenance costs.
  5. 5. Brief Overview of How it WorksBrief Overview of How it Works Two connections – one is made to theTwo connections – one is made to the Internet and the second is made to theInternet and the second is made to the VPN.VPN. Datagrams – contains data, destinationDatagrams – contains data, destination and source information.and source information. Firewalls – VPNs allow authorized usersFirewalls – VPNs allow authorized users to pass through the firewalls.to pass through the firewalls. Protocols – protocols create the VPNProtocols – protocols create the VPN tunnels.tunnels.
  6. 6. Four Critical FunctionsFour Critical Functions AuthenticationAuthentication – validates that the data was– validates that the data was sent from the sender.sent from the sender. Access controlAccess control – limiting unauthorized users– limiting unauthorized users from accessing the network.from accessing the network. ConfidentialityConfidentiality – preventing the data to be– preventing the data to be read or copied as the data is beingread or copied as the data is being transported.transported. Data IntegrityData Integrity – ensuring that the data has– ensuring that the data has not been alterednot been altered
  7. 7. EncryptionEncryption Encryption -- is a method of “scrambling”Encryption -- is a method of “scrambling” data before transmitting it onto thedata before transmitting it onto the Internet.Internet. Public Key Encryption TechniquePublic Key Encryption Technique Digital signature – for authenticationDigital signature – for authentication
  8. 8. TunnelingTunneling A virtual point-to-point connectionA virtual point-to-point connection made through a public network. It transportsmade through a public network. It transports encapsulated datagrams.encapsulated datagrams. Encrypted Inner Datagram Datagram Header Outer Datagram Data Area Original Datagram Data Encapsulation [From Comer] Two types of end points:  Remote Access  Site-to-Site
  9. 9. Three Protocols used in VPNThree Protocols used in VPN PPTP -- Point-to-Point Tunneling ProtocolPPTP -- Point-to-Point Tunneling Protocol L2TP -- Layer 2 Tunneling ProtocolL2TP -- Layer 2 Tunneling Protocol IPsec -- Internet Protocol SecurityIPsec -- Internet Protocol Security
  10. 10. Types of VPNTypes of VPN 3 Types3 Types Intranet – Within an organizationIntranet – Within an organization Extranet – Outside an organizationExtranet – Outside an organization Remote Access – Employee to BusinessRemote Access – Employee to Business
  11. 11. Virtual Private Networks (VPN) Basic Architecture
  12. 12.  Eliminating the need for expensive long-distanceEliminating the need for expensive long-distance leased linesleased lines  Reducing the long-distance telephone chargesReducing the long-distance telephone charges for remote access.for remote access.  Transferring the support burden to the serviceTransferring the support burden to the service providersproviders  Operational costsOperational costs Advantages:Advantages:
  13. 13. VPNs require an in-depth understanding ofVPNs require an in-depth understanding of public network security issues and properpublic network security issues and proper deployment of precautionsdeployment of precautions Availability and performance depends on factorsAvailability and performance depends on factors largely outside of their controllargely outside of their control Immature standardsImmature standards VPNs need to accommodate protocols otherVPNs need to accommodate protocols other than IP and existing internal network technologythan IP and existing internal network technology DisadvantagesDisadvantages
  14. 14. THANK YOUTHANK YOU

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