The number of sub domain or a domain class depends on the administrator defines. The number of classes of domain name has no relationship with the IP address, but somehow. The name of the domain on the left will indicate more specific machine name. The right domain name is pointing to a larger domain. This behavior is different from the IP address that the figures on the right identifies a particular host rather than on the left. The following example is the fully qualified domain name with a different number of sub domains.Www.ee.eng.chula.ac.th, www of the Department of electrical engineering, Chulalongkorn University.Www.tu-muenchen.de, www the University of Munich in Germany.Ftp.mci.com MCI appliance company's ftpHp.com hp machines of Hitachi walet-khakad packageAbsolute and relative domain domain.The domain name that is written on the path from the node to the root end. Also called the absolute domain name (Absolute domain name) the name of the domain that is partially written, called the relative domain name (domain name Relative)The absolute domain names usually end with a dot to indicate the root end, and in order to distinguish from the relative domains, such as tpt.nectec. or.th. but in practice is often marked by a point, because the domain name usually represents the absolute domain in itself. Some applications, such as electronic mail programs cannot use points to close at the end of the domain, even if the name is used as a domain controller, the absolute.D-n-s is a relative domain name for ease of reference. D-n-s is considered a domain name that does not end with a dot is a domain relative and absolute domain names are created, such as the user may type only DNA and tpt s more nectec.or.th domain name suffix. Before proceeding, it is good n s need to know the domain name prior to the network. How to determine the network ID, domain name, depending on the operating system used. For example, on a UNIX-based operating systems define the network ID, domain name, and other information in/etc/resolv.conf file.
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