Transcript osi layer - Learning Sources

OSI LAYER
Once upon a time… there was a boy
who wants to learn about the OSI model
of the Network…
Wah wah, When
I grow up, I want
to learn about
the OSI model,
wah wah
I grown-up now,
Can you help me
understand the
about OSI?
Hey Friend, OSI is an
international standard
established primarily by the ISO
and ITU-TS (International
Telecommunication UnionTelecommunication
Standardization Sector)
In other words, OSI is a
manufacturer-independent,
so therefore, it is an
international standard
architecture.
What is the role
played by OSI?
Hey, click me for you to
understand how OSI plays…
OSI
And I’m a
German
baby
I’m a
Japanese
baby
German
English
Japanese
Interpreter
A
Interpreter
B
Interpretation
So, it means that common
language is the role that OSI
plays in the network
architecture.
In addition, no matter what kind of
software is running on a network,
and regardless of what kind of data is
transmitted, problem-free data
communication will be possible on
the OSI layer network.
What is the structure of the
OSI model?
OSI Basic Reference Model
Application Layer
7th Layer
Provides communication services
required for applications
Presentation Layer
6th Layer
Data representation, format translation
and mapping
Session Layer
5th Layer
Dialog management, synchronization
point control, etc.
Transport Layer
4th Layer
Guarantees data transmission between
end-to-end, etc.
Network Layer
3rd Layer
Routing functions, etc.
Data-Link Layer
2nd Layer
Guarantees data transmission between
adjacent systems, error control, etc.
Physical Layer
1st Layer
Connector and pin shapes, transmission
media, etc.
It means that there are 7
layers in an OSI model
The 7 layers can be divided
into upper and lower layers
Provides communication
service functionalities
Provides data transmission
functionalities
The lower layers ensure highquality transfer of data, and
the upper layers utilize the
functions of the lower layers
to provide communication
services for applications
Upper layer
Lower layer
Why it uses
Layered Model?
All People Seem To Need Data Processing
OSI Model Application Layer
OSI Model Presentation Layer
OSI Model Session Layer
OSI Model Transport Layer
OSI Model Network Layer
OSI Model Data Link Layer
OSI Model Physical Layer
Hu Hu Hu, please explain
further…
Five Conversion steps of Data
Encapsulation
Data
Segments
Packets
Frames
Bits
Upper layers convert and format
the information into data and send
it to the Transport Layer.
The Transport layer turns the data into
The NetworkThe
layer
Data
receives
Link layer
the segments
receives the packets
segments and sends them toThe
thePhysical layer receives the frames
and convertsand
them
converts
into packets
them into
andframes
adds and adds
Network layer. and converts them into bits to be put on
header information
header information
(logical addressing)
(physical source and
the
network
medium.
and sends them
destination
to the Data
addresses)
Link Layer.
and
sends the
frames to the Physical Layer.
Data >> Segments >> Packets >> Frames >> Bits
JAPAN
(Company A)
Italy
(Company B)
Application
Person in charge in
company A prepares
documents
Presentation
Interpreter translate
to English for
common use
between company A
and B
Person in charge in
company B prepares
documents and hand
to company Pres
Interpreter translate
from English to
Italian
Session
The receptionist
hands cargo to post
office worker
The post office
worker hands cargo
to receptionist
Transport
Cargo is moved from
Company A to post
office
Cargo is brought to
post office to
company B
Network
Cargo is moved via
Amsterdam
Transportatio
n to Rome
Airport
Data Link
Flight attendants have
the responsibility until
arrival at Amsterdam
until arrival
at Rome
Physical
In Airplane
In Airplane
Finally arrives at
Rome airport
Flight attendants arrive
safely
In Airplane
Devices Function At Layers
Know These!
Devices Function At Layers
Also know that each device not
only works at its layer, but all
layers below it.
Devices Function At Layers
For example, a router is a layer
3 device but also uses MAC
addresses (layer 2) and repeats
the signal (layer 1)
Devices Function At Layers
One last bit of information from Chapter 3
At what layers do
ALL 7two
LAYERS!!
these
operate?
The Cloud
That’s the OSI Layer.
What’s the
communication under
TCP/IP layer?
Assignment
Compare the OSI layer
to the TCP/IP layer in terms of
architecture?