What is virtual network short message?

A virtual network is a computer network that contains at least some virtual network links. Virtual network link does not include the physical connection between two computing devices, but is realized through network virtualization.

Classification of virtual network: VLAN (Virtual local area network) is based on switching technology. According to the nature and needs of work, network nodes are divided into several "logical working groups", and a "logical working group" is a virtual network. There are four technologies to realize VLAN: virtual network is defined by switch port number, virtual network is defined by MAC address, virtual network is defined by IP broadcast group and virtual network is defined by network layer address. The division and management of "logical working group" is realized by software. VPN: VPN (Virtual Private Network) refers to the technology of establishing a private network on the * * * network.

It is called a virtual network mainly because the connection between any two nodes of the whole VPN network does not have the point-to-point physical link required by the traditional private network construction, but is a logical network built on the network platform provided by the public network service provider ISP. User's data is transmitted through the logical tunnel established by ISP on the public network (Internet), that is, the point-to-point virtual private line. Through the corresponding encryption and authentication technology to ensure the safe transmission of user intranet data on the public network, so as to truly realize the exclusiveness of network data.