Domain name and identifier are the identity representation of each subject in the packet data network,which are the identity certificates of an organization or individual in the computer network.It is the registration and identification method of each subject,as well as the basis for network operators to charge users for service management.In fact,a country’s entire collection of individual domain names and identifiers constitutes the country’s virtual cyberspace,just as the global collection of domain names constitutes the global cyberspace under IP network.Domain name and identifier are in fact the objective embodiment and existence of virtual cyberspace.The so-called security of cyberspace is the security of the contents and devices of each domain name or its corresponding IP address in the space.Therefore,how to define the structure of domain name and identifier string and how to construct the allocation,registration,resolution and service management system of domain name and identifier are the most basic matters for the reliable,stable and safe operation of packet data networks.
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