We often use VPNs in our work. In particular, companies and organizations that have strong confidentiality tend to use VPNs. Well, Vaughan now gives everyone a science VPN.
VPN
What is a VPN
A virtual private network (VPN) refers to a technology for establishing a private network on a public network. It is called a virtual network because the connection between any two nodes of the entire VPN network does not have the end-to-end physical link required by the traditional private network, but is based on the network provided by the public network service provider. Platforms, such as the Internet, logical networks over ATM (Asynchronous Transfer Mode), Frame Relay, etc., where user data is transmitted over logical links. The function of the virtual private network is to establish a private network on the public network for encrypted communications. Widely used in enterprise networks. The VPN gateway implements remote access by encrypting the data packet and converting the destination address of the data packet. There are many ways to classify VPNs, mainly classified by agreement. VPNs can be implemented in various ways such as servers, hardware, and software. It covers the expansion of private networks that encapsulate, encrypt, and authenticate links across shared or public networks. VPN mainly uses tunnel technology, encryption and decryption technology, key management technology, and user and device identity authentication technologies.
How to classify VPN
According to different classification criteria, VPNs can be classified according to the following criteria:
1. Classified by VPN protocol
There are three types of VPN tunneling protocols: PPTP, L2TP, and IPSec. PPTP and L2TP work in Layer 2 of the OSI model, also known as Layer 2 tunneling protocols. IPSec is the Layer 3 tunneling protocol and is the most common protocol. The use of L2TP and IPSec together is the best performance and the most widely used one. Internet Protocol Security (IPSecurity) is an open standard framework that uses encrypted security services to ensure secure and secure communications over Internet Protocol (IP) networks.
2. Classified by application of VPN
1) Access VPN: Client-to-gateway, using the public network as the backbone to transmit VPN traffic between devices
2) Intranet VPN (intranet VPN): gateway to gateway, connecting resources from the same company through the company's network architecture
3) Extranet VPN (Extranet VPN): Constructs an extranet with a partner company network, connecting one company to another company's resources
3. Classify by the type of equipment used
Network equipment providers develop different VPNs for different customer needs
Network devices, mainly switches, routers, and firewalls
1) Router VPN: Router VPN deployment is easy, just add VPN service to the router
2) Switched VPN: It is mainly used to connect VPN networks with few users
3) Firewall-based VPN: Firewall-based VPN is the most common form of VPN implementation. Many vendors provide this type of configuration.
4.VPN classified by application
According to the application classification, it can be divided into VLL, VPLS, VPDN, and VPRN. VPLS is an L2 VPN (Layer 2 VPN) technology that enables service providers to make reasonable use of existing network resources and use existing IP/ATM metropolitan areas without building an IP/MPLS network. The network provides customers with a more economical, effective and practical VPN solution.
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