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Data communication and
computer networks
1: C
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The story
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Structure of the internet
?
?
E?
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Structure of the internet C
://./
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Structure of the internet =
/
/ 2 / / A
E: .. ..(!)
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Structure of the internet : 1, 2,
3 C,C & , ,, A&,
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Structure of the internet://..//
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Structure of the internet
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Structure of the internet
C : ://../
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Structure of the internet A / A / A / A / A /
A ( )
(. )
( , ,...)
: , , ,A
A ( ) , 1 ( 1 )
, 1
: , , F,
A ( )A ( A)
A ( )
...
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Network devices
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TCP/IP C/ !
, :
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TCP/IP
C/
E C/
C/
E C/
E C/
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TCP/IP
C/
A C/
C/
A C/
A C/
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TCP/IP
C/
F C/
C/
F C/
F C/
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A layered network design
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OSI model
5>7A
4 2
1>3 2
L3: Network
L7: Application
L5: Session
L6: Presentation
L4: Transport
L2: Data Link
L1: Physical
!
=
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OSI model 1:
C
D
...
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OSI model 2:
E /
F
F A
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OSI model 3:
( )
F
C A
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OSI model 4:
, ..:
C /
/ ()
C
F
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OSI model 5:
,
A
, .. A/
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OSI model 6:
() 2
(AC, EBCDC,...)
D (/ , )
E
C
...
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OSI model 7:
E.. &
D /
E.. GE
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OSI model
G
/
/
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Network devices G
3
(47)
@
2
C /
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Network devices
F
@AC
C
A
A, ,
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Network devicesE: A