The meaning of authority to administer a domain is a top-level domain administrators cannot manage a domain level directly below. However, the lower level domain administrator permissions are missing in action, all lower-level domains. Sub domain administrator can add the computer name in the database, or create sub domains as needed. In a specific subdomain subdomain is down further, you can mandate to reduce the burden of care has likewise. This behavior may be compared with the work in a company Manager, assign tasks, head of the Department responsible for the work.In a domain with administrative authority or not, it is the policy of the domain directly. Some domains may create sub-domains, but do not have any authority at all. Or, there may be some specific empowerment subdomain only. How to create a sub domain administration and empowered in the process, a specific DNA technique is the ACE beyond the scope of this report. In this case I will describe only the main authority which related to a basic understanding of the domain and the zone will be discussed in the next topic.Domains and zones.The meaning of the zone (zone) is a subdomain in the DNA which have the authority to have a specific administrator. Within the zone may be divided to sub zone to another according to the Organizational Committee. Each zone contains the name server serves data preservation zone.When the administrator receives a mandate manage zone administrators will install a named server, database, and create a zone ID to store the machine name with IP addresses in the zone manually. Managed by a system administrator, is the meaning of delegated powers. The name server stores information in any of the zones will have the Authority (authority) in the zone. An example of obtaining a mandate, there are top level domain administrator .com .net and .org, as well as the administration by the company by the Department of Defense .mil design centered care of us and the country-level domain is administered by persons who have been empowered as the Registrar of domain names of countries, etc.The name server.The zone administrator to install a master name server (master name server) and sale fanem Server (slave name server) [6] master zone's name servers, and the sale was a different server fanem machine. Master name server is a name server that reads data from a file, the zone's information stored in the system information (such as a hard disk) One son is a single master server account. Best sale fanem server will copy the data from the master name server is stored by transferring over the network. Fanem sale server has several tools to act as a master name server: name server: when unable to service. Domain name registration, it must specify the name of the name server, at least two names. The first name is the name of the master name server and another one is sale fanem server.Master name server contains zone credentials. Administrators can add or delete DNA s host name or change the name of the master server information only. When it's time to define the dotle dump fanem servers from the master name server automatically, so that the data is the same. This is called transfer transfer zone (zone transfer)The principle of operation of the s-n-d.Good work process n-s consists of The solo lawoe (resolver), which is a program in which the client s n khoprikandi that determines whether it is in the domain name and the server must be contacted.Rae process solution.The name server does not just provide the data in a zone under the authority only. If you want to trace another namespace-wide data to another server, the account that the service edge. For example, a server named in top ku.ac.th affiliation may ask for the host name in the name server based nectec.or.th affiliation of nectec.or.th process of tracing the name by name, this name is called the host server solution (name resolution), or short call that re solution (resolution) Regina s DNA solution work the client server The solo lawoe acts as a client and a server named server pages work. Figure 4 in the name server solutions and lawoe preserves the information in the trace cache. The name server to query the data in the cache to improve performance chakon. If found, it uses the information in the cache chotopklap. Name server: http://, and then stores the data in the cache chaphiang for a period of time and then deleted because the information is subject to change at any time.
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