domain.countryhostnameA name by which the machine is known. This name must be unique to the site on which the machine is located.siteA short name given to the site (company, University, government department etc) on which the machine resides.domainEach site belongs to a specific domain. A domain is used to group sites of similar purpose together. countrySpecifies the actual country in which the machine resides. For example the CQU machine jasper's fully qualified name is jasper.cqu.edu.au, where jasper is the hostname, cqu is the site name, the domain is edu and the country is au.DomainPurposeEduEducational institution, university or schoolComCommercial companyGovGovernment departmentNetNetworking Companies4.12 QUALIFIED NAMEShostname :Under Linux the hostname of a machine is set using the hostname command. Only the root user can set the hostname. Any other user can use the hostname command to view the machine's current name.A) Qualified Namesjasper.cqu.edu.au is a fully qualified name and uniquely identifies the machine jasper on the CQU campus to the entire Internet. There cannot be another machine called jasper at CQU. However there could be another machine called jasper at James Cook University in Townsville (its fully qualified name would be jasper.jcu.edu.au).A fully qualified name must be unique to the entire Internet. Which implies every hostname on a site should be unique.B)Not QualifiedIt is not always necessary to specify a fully qualified name. If a user on aldur.cqu.edu.au enters the command telnet jasper the networking software assumes that because it isn't fully qualified hostname the user means the machine jasper on the current site (cqu.edu.au).4.13 NAME RESOLUTIONA) Name ResolutionMost users will use hostnames when using the Internet. However the TCP/IP networking software always uses the host address. When you enter http://www.lycos.com/ with Netscape the first thing the networking software does is find the IP address...
