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Identifier
created by
kessenich
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thing
) by
kessenich
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1
C!
Sat Mar 04 2000 at 9:40:36
A 16-bit field in the
IP packet header
that is used in conjunction with the
Flags
and
Fragment Offset
fields for packet fragmentation. Packets must be fragmented if the original length exceeds the Maximum Transmission Unit (
MTU
) of a
data link
that they travel on. If they
are
fragmented, the
router
marks each fragment with the same number in the Identifier field so that the receiving device is able to reassemble the packets.
(
thing
) by
Gorgonzola
(2.6 hr)
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Sat Apr 28 2001 at 0:29:05
A type of
token
extracted during the
lexical analysis
phase of compiling a
computer program
. Most
programming language
s
1
define an identifier as a
letter
2
followed by any number of letters or digits. However, most languages
3
reserve certain of these character sequences as
keywords
, not allowing programmers to make identifiers from them.
Programmers create identifiers to name things in their programs:
macro
s
constant
s
type
s
variable
s (aka
object
s)
routine
s (aka
procedure
s,
function
s, and
method
s)
1
There is at least one language that confuses identifiers and string literals, and infers which is which only from context.
2
The definition of a "letter" varies between computer languages. Some allow only
upper case
letters, but most allow
lower case
letters and/or
underscore
s.
3
Again, some languages recognize keywords only where they are meaningful as keywords, and allow them to be used as identifers! There is the opposite example of
C++
which reserves any sequence beginning with an underscore followed by a capital letter or another underscore for compiler and library implementors.
printable version
chaos
DoubleClick Master Database
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Globally Unique Identifier
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pertnear
White space
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klass
id
Organizational Unique Identifier
The CD standard is moronic
DHCP
fragmentation
IP Packet Header
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