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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