Three types of VPN-networks
Local area network (LAN, LAN) - a computer network covering a relatively small area generally or small group of buildings (home, office, company, institution).
Wide area network, WAN (WAN) - a computer network that covers a large area and includes hundreds of thousands of computers.
Metropolitan Area Network (MAN) (from the English. “network of a large city”) – connects computers in the city, is a network of the size smaller than a WAN, but more than a LAN.
Network storage (Storage Area Network – SAN) called specialized dedicated high-speed networks that move data between servers and storage resources. Because they are separate dedicated networks, conflicts between data streams from servers and clients do not arise.
Data Center (Data Center) - a globally coordinated network of devices intended to accelerate the delivery of information on infrastructure Internet. Improves the use of various information such as broadband video streaming. Structure with the data center improves network performance and eliminating the need to stream video over the LAN infrastructure. Data center eliminates potential sources of overflow in the network by distributing the load among multiple devices collect and process information that are close to the recipients of information and data. Web-based and diverse multimediainformatsiya copied the storage device, and for users to create optimal routes of the device.
For example, when downloading the movie from Internet-ISP (Internet Service Provider – ISP), instead of hours to wait for the appropriate download a large file, the same movie can be downloaded in a few minutes if the Internet-provider uses technology from storage or processing data since the latter can significantly speed up the delivery of information.
Virtual private networks
Virtual private network (Virtual Private Network – VPN) – a private network that is created in an open network infrastructure, for example, Internet. Using the VPN-network, you can get access to the company’s head office over the Internet by creating a secure tunnel between your computer and the employee’s VPN-router at the main office.
Virtual Private Network – a service that provides a safe and secure connection over a shared public network infrastructure, such as the Internet. This is the most economical way to create a connection type” point to point” between remote users and enterprise network.
There are three types of VPN-networks:
- VPN-access network (Access VPN) provide remote access to mobile workers and small office / home office (Small Office / Home Office – SOHO) to the internal or external network (Intranet or Extranet) head office on a shared infrastructure. VPN-access network using analog remote access technology ISDN, DSL, mobile IP-protocol connections and cable technology to create a secure connection between the head office, remote workers and branch offices.
- VPN-network Intranet (internal virtual private network) link together the regional and branch offices to the head office of the company in a shared infrastructure using dedicated lines. VPN-internal network (Intranet) differs from the external VPN-networks (Extranet) that they allow access only to employees of the company.
- VPN-network Extranet (external virtual private network) connect business partners with a network head office through shared infrastructure using dedicated lines. External VPN-networks allow access to some users who are not employees of the company.