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SMI
defines the structure of the MIB information and the allowable data types. The
SMI identifies how resources within the MIB are represented and named.
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The
philosophy behind SMI is to encourage simplicity and extensibility within the
MIB.
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The
SNMP specification includes a template, known as an Abstract Syntax Notation
One (ASN.1) OBJECT TYPE macro, which provides the formal model for defining
objects and tables of objects in the MIB.
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Several
data types are allowed in SMI. the primitive data types consists of INTEGER, OCTET
STRING, NULL, and OBJECT IDENTIFIER
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Primitive
data types are written in uppercase, while user defined data types start with
an uppercase letter but contain at least one character other than an uppercase
letter.
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An
OBJECT IDENTIFIER is represented as a sequence of nonnegative integers where each
integer corresponds to a particular node in the tree.
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Data
type is used to identify a managed object and relating its place in the object hierarchy.
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