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When the Internet was small, mapping was done by using a host file The host file had only two columns: name and address Every host could store the host file on its disk and update it periodically from a master host file When a program or a user wanted to map a name to an address, the host consulted the host file and found the mapping Today, however, it is impossible to have one single host file to relate every address with a name and vice versa The host file would be too large to store in every host In addition, it would be impossible to update all the host files every time there was a change One solution would be to store the entire host file in a single computer and allow access to this centralized information to every computer that needs mapping But we know that this would create a huge amount of traffic on the Internet Another solution, the one used today, is to divide this huge amount of information into smaller parts and store each part on a different computer In this method, the host that needs mapping can contact the closest computer holding the needed information This method is used by the Domain Name System (DNS) In this chapter, we first discuss the concepts and ideas behind the DNS We then describe the DNS protocol itself

To be unambiguous, the names assigned to machines must be carefully selected from a name space with complete control over the binding between the names and IP addresses In other words, the names must be unique because the addresses are unique A name space that maps each address to a unique name can be organized in two ways: fiat or hierarchical

In a flat name space, a name is assigned to an address A name in this space is a sequence of characters without structure The names mayor may not have a common section; if they do, it has no meaning The main disadvantage of a fiat name space is that it cannot be used in a large system such as the Internet because it must be centrally controlled to avoid ambiguity and duplication

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In a hierarchical name space, each name is made of several parts The first part can define the nature of the organization, the second part can define the name of an organization, the third part can define departments in the organization, and so on In this case, the authority to assign and control the name spaces can be decentralized A central authority can assign the part of the name that defines the nature of the organization and the name of the organization The responsibility of the rest of the name can be given to the organization itself The organization can add suffixes (or prefixes) to the name to define its host or resources The management of the organization need not worry that the prefix chosen for a host is taken by another organization because, even if part of an address is the

CompTIA is a nonprofit, industry trade association based in Oakbrook Terrace, Illinois, on the outskirts of Chicago Tens of thousands of computer resellers, value-added resellers, distributors, manufacturers, and training companies from all over the world are members of CompTIA CompTIA was founded in 1982 The following year, CompTIA began offering the CompTIA A+ certification exam CompTIA A+ certification is now widely recognized as a de facto requirement for entrance into the PC industry Because the A+ exam covers networking only lightly, CompTIA decided to establish a vendor-neutral test covering basic networking skills So, in April 1999, CompTIA unveiled the CompTIA Network+ certification exam CompTIA provides certifications for a variety of areas in the computer industry, offers opportunities for its members to interact, and represents its members interests to government bodies CompTIA certifications include A+, Network+, Security+, and RFID+, to name a few Check out the CompTIA Web site at wwwcomptiaorg for details on other certifications CompTIA is huge Virtually every company of consequence in the IT industry is a member of CompTIA: Microsoft, Dell, Cisco name an IT company and it s probably a member of CompTIA

same, the whole address is different For example, assume two colleges and a company call one of their computers challenger The first college is given a name by the central authority such as jhdaedu, the second college is given the name berkeleyedu, and the company is given the name smart com When these organizations add the name challenger to the name they have already been given, the end result is three distinguishable names: challengerjhdaedu, challengerberkeleyedu, and challengersmartcom The names are unique without the need for assignment by a central authority The central authority controls only part of the name, not the whole

To have a hierarchical name space, a domain name space was designed In this design the names are defined in an inverted-tree structure with the root at the top The tree can have only 128 levels: level 0 (root) to level 127 (see Figure 252)

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