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Object identifiers (ctd)

Object IdentifiersEdit

Object identifiers are unique numeric values that are granted by various issuing authorities to identify data elements, syntaxes, and other parts of distributed applications. Because they are globally unique, object identifiers ensure that the objects that are defined by these issuing authorities do not conflict with one another when different directories, such as Active Directory and Novell Directory Services, are brought together in a global directory namespace

MIB module is represented by a node in OID tree.Each node is identified by Context + Number / String to identify its management information.Specically,Context is position in hierarchy; Number is intented for machine processing;String are chars, which is tented for human. Moreover, Strings identifying Internet tend to be flat, For instance, it should be ipv6RouterAdvertMaxInterval, not ipv6.RouterAdvert.MaxInterval, or hierarchical numeric identifiers, which is mixed, like ip.39(ipv6RouterAdvertTable).3(MaxInterval).

Object identifier notation is a dotted string of non-negative numbers (for example, 1.2.840.113556.1.5.4), the components of which are shown in Table below

{| border="0" cellpadding="1" cellspacing="1" class="article-table article-table-selected" style="width: 500px; "

! scope="col"|Numerical Values of the Sample Object Identifier ! scope="col"|What the Numerical Values Denote |- |1 | style="text-align:left;"|ISO ("root" authority) Issued 1.2 to ANSI, which in turn . . . |- |2 | style="text-align:left;"|ANSI Issued 1.2.840 to USA, which in turn . . . |- |840 | style="text-align:left;"|USA Issued 1.2.840.113556 to Microsoft, which . . . |- |113556 |Microsoft Internally manages several object identifier branches under 1.2.840.113556 that include . . . . |- |1 |Active Directory A branch called Active Directory that includes . . |- |5 |Classes A branch called Classes that includes . . . . |- |4 |Builtin-Domain A class called Builtin-Domain. |}

See also

Dotty Object Identifiers discusses the use of dots as separators within object identifiers

This is related to silde 6 in lecture 3 in TELE9752

Further reading

ITU Recommendation X.208 defines object identifiers, though has been superseded by ITU Recommendation X.680 and its companions X.681-X.695.