VPNs: Architecture, Advantages, and Disadvantages PDF

IT Infrastructure Architecture Infrastructure Building Blocks and Concepts VPN (chapter 8)  Network Design for different sized Business Organizations, Using public networks for secure data transport: VPNs  Virtual Private Network...

IT Infrastructure Architecture Infrastructure Building Blocks and Concepts VPN (chapter 8)  Network Design for different sized Business Organizations, Using public networks for secure data transport: VPNs  Virtual Private Network (VPN) A Virtual Private Network (VPN) uses a public network to interconnect private sites in a secure way – Also known as a VPN tunnel VPN uses "virtual" connections based on IPsec/SSL Most network providers also offer private VPNs based on MPLS  Virtual Private Network (VPN) VPNs use strong encryption and strong user authentication – Using the internet for transmitting sensitive data is considered safe VPN tunnels are often used for remote access to the LAN by users outside of the organization's premises  Virtual Private Network (VPN) Most common VPN communications protocol standards: – Point-to-Point Tunneling Protocol (PPTP) for individual client to server connections – Layer 2 Tunneling Protocol (L2TP) for individual client to server connections – IPsec for network-to-network connectivity IPsec is built into IPv6 standard and is implemented as an add-on to IPv4  Tunneling A virtual point-to-point connection made through a public network. It transports encapsulated datagrams. Original Datagram Encrypted Inner Datagram Datagram Header Outer Datagram Data Area Data Encapsulation [From Comer]  Advantages: Cost Savings Eliminating the need for expensive long- distance leased lines Reducing the long-distance telephone charges for remote access. Transferring the support burden to the service providers Operational costs  Advantages: Scalability Flexibility of growth Efficiency with broadband technology  Disadvantages VPNs require an in-depth understanding of public network security issues and proper deployment of precautions Availability and performance depends on factors largely outside of their control. Immature standards VPNs need to accommodate protocols other than IP and existing internal network technology  Where Do We See VPNs Going in the Future? VPNs are continually being enhanced. As the VPN market becomes larger, more applications will be created along with more VPN providers and new VPN types. Networks are expected to converge to create an integrated VPN Improved protocols are expected, which will also improve VPNs.  Watch this video of how a VPN works!!! https://www.youtube.com/watch?v=gX 1nM_p0m0I