Active in the era.In the beginning of the use of alternative names, addresses. The database that stores the machine name that agreement with the IP address as a single database. This database is maintained by the network information center, Stanford Research Institute (Stanford Research Institute Network Information Center, or SRI-NIC) is a network that you want to use the database will require lathai, file transfer protocol or FT p (FTP: File Transfer Protocol) to fetch list and addresses to use. A central database will be constantly improved so that each of the network last dump. This model is the approach that is not a problem in the age of computer networks and because of the limited Government and educational institutions, but the number of computer and network expansion and more. The transfer process started experiencing difficulties:The centralized database updates not responding to the increasing rate of the computer promptly.The database is very large. The transfer takes and uses the channel makes much impact other applications.The original database is stored on the same level. Causing the problem handle when people ask for the same name.For this reason, it is a concept to improve the service system a new name. The system converts the name modified to automatic systems that use the distribution database. A protocol for the database connection and automatic data updates. The naming format there is a hierarchical structure to prevent duplicate names. These systems are subject to the requirements of s-DNA protocols (DNS: Domain Name System) or called the domain name system.
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