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This is a overview of the basic concept of OSI model.
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April 12, 2023 1
DURJOY SEN MAITRAROLL NO – 11G4MMS040
MSC (COMPUTER SCIENCE)3RD SEMISTER
BARRACKPORE RASTRAGURU SURENDRANATH COLLEGE
2
WHY WE NEED A NETWORK MODELTASK INVOLVED IN SENDING A
LETTEROSI MODEL INTRODUCTION
OVERVIEW OF OSI MODELPEER-TO-PEER PROCESS
DESCRIPTION OF OSI MODELAPPLICATION LAYER
PRESENTATION LAYERSESSION LAYER
TRANSPORT LAYERNETWORK LAYERDATA LINK LAYERPHYSICAL LAYER
CONCLUSIONREFERENCES
April 12, 2023
3
WHY WE NEED A NETWORK MODEL ?
April 12, 2023
4
TASKS INVOLVED IN SENDING LETTER
April 12, 2023
April 12, 2023 5
THE OSI MODEL
NETWORK LAYER
DATA LINK LAYER
PHYSICAL LAYER
TRANSPORT LAYER
SESSION LAYER
PRESENTATION LAYER
APPLICATION LAYER
User support layers
Network support layers
Link this two subgroups
April 12, 2023 6
OVERALL VIEW OF OSI MODEL
NETWORK
DATA LINK
PHYSICAL
TRANSPORT
SESSION
PRESENTATION
APPLICATION
SENDER RECEIVER
April 12, 2023 7
Ethernet LANEthernet LAN WAN
NETWORK
DATA LINK
PHYSICAL
TRANSPORT
SESSION
PRESENTATION
APPLICATION
NETWORK
DATA LINK
PHYSICAL
TRANSPORT
SESSION
PRESENTATION
APPLICATION
NETWORK
DATA LINK
PHYSICAL
Router
NETWORK
DATA LINK
PHYSICAL
Router
SENDER RECEIVER
April 12, 2023 8
NETWORK NETWORKNETWORK NETWORK
DATA LINK DATA LINKDATA LINK DATA LINK
PHYSICAL PHYSICALPHYSICAL PHYSICAL
TRANSPORT TRANSPORT
SESSION SESSION
PRESENTATION PRESENTATION
APPLICATION APPLICATION• File transfer, access,
and management• Mail services
• Directory services• Network virtual
terminal
Ethernet LANEthernet LAN WAN
Router Router
DATA
SENDER RECEIVER
April 12, 2023 9
NETWORK NETWORKNETWORK NETWORK
DATA LINK DATA LINKDATA LINK DATA LINK
PHYSICAL PHYSICALPHYSICAL PHYSICAL
TRANSPORT TRANSPORT
SESSION SESSION
PRESENTATION PRESENTATION
APPLICATION APPLICATION
- Translation- Encryption
- Compression
Ethernet LANEthernet LAN WAN
Router Router
DATA
SENDER RECEIVER
April 12, 2023 10
NETWORK NETWORKNETWORK NETWORK
DATA LINK DATA LINKDATA LINK DATA LINK
PHYSICAL PHYSICALPHYSICAL PHYSICAL
TRANSPORT TRANSPORT
SESSION SESSION
PRESENTATION PRESENTATION
APPLICATION APPLICATION
• Dialog control
Ethernet LANEthernet LAN WAN
Router Router
DATA
SENDER RECEIVER
April 12, 2023 11
NETWORK NETWORKNETWORK NETWORK
DATA LINK DATA LINKDATA LINK DATA LINK
PHYSICAL PHYSICALPHYSICAL PHYSICAL
TRANSPORT TRANSPORT
SESSION SESSION
PRESENTATION PRESENTATION
APPLICATION APPLICATION
Ethernet LANEthernet LAN WAN
Router Router
1050 MB downloaded2GB data
2GB dataDownload starting from 1000MB
Synchronization
DATA
SENDER RECEIVER
......................100MB
200MB
300MB Check points
April 12, 2023 12
NETWORK NETWORKNETWORK NETWORK
DATA LINK DATA LINKDATA LINK DATA LINK
PHYSICAL PHYSICALPHYSICAL PHYSICAL
TRANSPORT TRANSPORT
SESSION SESSION
PRESENTATION PRESENTATION
APPLICATION APPLICATION
Segmentation
Ethernet LANEthernet LAN WAN
Router Router
DATA
SENDER RECEIVER
April 12, 2023 13
NETWORK NETWORKNETWORK NETWORK
DATA LINK DATA LINKDATA LINK DATA LINK
PHYSICAL PHYSICALPHYSICAL PHYSICAL
TRANSPORT TRANSPORT
SESSION SESSION
PRESENTATION PRESENTATION
APPLICATION APPLICATION
- Connection control- Error control
Ethernet LANEthernet LAN WAN
Router Router
DATA
SENDER RECEIVER
April 12, 2023 14
NETWORK NETWORKNETWORK NETWORK
DATA LINK DATA LINKDATA LINK DATA LINK
PHYSICAL PHYSICALPHYSICAL PHYSICAL
TRANSPORT TRANSPORT
SESSION SESSION
PRESENTATION PRESENTATION
APPLICATION APPLICATION
- Logical addressing- Routing
Ethernet LANEthernet LAN WAN
Router Router
DATA
SENDER RECEIVER
April 12, 2023 15
NETWORK NETWORKNETWORK NETWORK
DATA LINK DATA LINKDATA LINK DATA LINK
PHYSICAL PHYSICALPHYSICAL PHYSICAL
TRANSPORT TRANSPORT
SESSION SESSION
PRESENTATION PRESENTATION
APPLICATION APPLICATION
- Physical addressing
Ethernet LANEthernet LAN WAN
Router Router
DATA
SENDER RECEIVER
April 12, 2023 16
NETWORK NETWORKNETWORK NETWORK
DATA LINK DATA LINKDATA LINK DATA LINK
PHYSICAL PHYSICALPHYSICAL PHYSICAL
TRANSPORT TRANSPORT
SESSION SESSION
PRESENTATION PRESENTATION
APPLICATION APPLICATION
- Error control- Flow control
- Access control
Ethernet LANEthernet LAN WAN
Router Router
DATA
SENDER RECEIVER
April 12, 2023 17
NETWORK NETWORKNETWORK NETWORK
DATA LINK DATA LINKDATA LINK DATA LINK
PHYSICAL PHYSICALPHYSICAL PHYSICAL
TRANSPORT TRANSPORT
SESSION SESSION
PRESENTATION PRESENTATION
APPLICATION APPLICATION
- Representation of bits- Data rate
- Physical topology- Transmission mode
Ethernet LANEthernet LAN WAN
Router Router
DATA
SENDER RECEIVER
April 12, 2023 18
NETWORK NETWORKNETWORK NETWORK
DATA LINK DATA LINKDATA LINK DATA LINK
PHYSICAL PHYSICALPHYSICAL PHYSICAL
TRANSPORT TRANSPORT
SESSION SESSION
PRESENTATION PRESENTATION
APPLICATION APPLICATION
- Syncronization of bits- Line Configuration
Ethernet LANEthernet LAN WAN
Router Router
DATA
SENDER RECEIVER
April 12, 2023 19
Ethernet LANEthernet LAN WAN
Router Router
NETWORK NETWORKNETWORK NETWORK
DATA LINK DATA LINKDATA LINK DATA LINK
PHYSICAL PHYSICALPHYSICAL PHYSICAL
TRANSPORT TRANSPORT
SESSION SESSION
PRESENTATION PRESENTATION
APPLICATION APPLICATION
The physical layer remove its corresponding header.
DATADATA
SENDER RECEIVER
April 12, 2023 20
NETWORK NETWORKNETWORK NETWORK
DATA LINK DATA LINKDATA LINK DATA LINK
PHYSICAL PHYSICALPHYSICAL PHYSICAL
TRANSPORT TRANSPORT
SESSION SESSION
PRESENTATION PRESENTATION
APPLICATION APPLICATION
The router removes the data link information and
sends it up to the network layer.
Ethernet LANEthernet LAN WAN
Router Router
DATA
SENDER RECEIVER
April 12, 2023 21
NETWORK NETWORKNETWORK NETWORK
DATA LINK DATA LINKDATA LINK DATA LINK
PHYSICAL PHYSICALPHYSICAL PHYSICAL
TRANSPORT TRANSPORT
SESSION SESSION
PRESENTATION PRESENTATION
APPLICATION APPLICATION
The router uses the destination IP address to determine where to send the packet next.
Ethernet LANEthernet LAN WAN
Router Router
DATA
SENDER RECEIVER
April 12, 2023 22
NETWORK NETWORKNETWORK NETWORK
DATA LINK DATA LINKDATA LINK DATA LINK
PHYSICAL PHYSICALPHYSICAL PHYSICAL
TRANSPORT TRANSPORT
SESSION SESSION
PRESENTATION PRESENTATION
APPLICATION APPLICATION
The router encapsulates the data with the proper data
link information for the WAN.
Ethernet LANEthernet LAN WAN
Router Router
DATA
SENDER RECEIVER
April 12, 2023 23
NETWORK NETWORKNETWORK NETWORK
DATA LINK DATA LINKDATA LINK DATA LINK
PHYSICAL PHYSICALPHYSICAL PHYSICAL
TRANSPORT TRANSPORT
SESSION SESSION
PRESENTATION PRESENTATION
APPLICATION APPLICATION
- Physical layer transmit the data over the
network
Ethernet LANEthernet LAN WAN
Router Router
DATA
SENDER RECEIVER
April 12, 2023 24
Ethernet LANEthernet LAN WAN
Router Router
NETWORK NETWORKNETWORK NETWORK
DATA LINK DATA LINKDATA LINK DATA LINK
PHYSICAL PHYSICALPHYSICAL PHYSICAL
TRANSPORT TRANSPORT
SESSION SESSION
PRESENTATION PRESENTATION
APPLICATION APPLICATION
In the same way data passes
through the 2nd router
DATA
SENDER RECEIVER
April 12, 2023 25
NETWORK NETWORKNETWORK NETWORK
DATA LINK DATA LINKDATA LINK DATA LINK
PHYSICAL PHYSICALPHYSICAL PHYSICAL
TRANSPORT TRANSPORT
SESSION SESSION
PRESENTATION PRESENTATION
APPLICATION APPLICATION
The physical layer remove its corresponding
header.
Ethernet LANEthernet LAN WAN
Router Router
DATA
SENDER RECEIVER
April 12, 2023 26
NETWORK NETWORKNETWORK NETWORK
DATA LINK DATA LINKDATA LINK DATA LINK
PHYSICAL PHYSICALPHYSICAL PHYSICAL
TRANSPORT TRANSPORT
SESSION SESSION
PRESENTATION PRESENTATION
APPLICATION APPLICATION
Remove the data link header and tailer and converts frames back
into IP packets.
Ethernet LANEthernet LAN WAN
Router Router
DATA
SENDER RECEIVER
April 12, 2023 27
NETWORK NETWORKNETWORK NETWORK
DATA LINK DATA LINKDATA LINK DATA LINK
PHYSICAL PHYSICALPHYSICAL PHYSICAL
TRANSPORT TRANSPORT
SESSION SESSION
PRESENTATION PRESENTATION
APPLICATION APPLICATION
Remove the IP header, converts the packets
back into segments and passes them back to
transport layer.
Ethernet LANEthernet LAN WAN
Router Router
DATA
SENDER RECEIVER
April 12, 2023 28
NETWORK NETWORKNETWORK NETWORK
DATA LINK DATA LINKDATA LINK DATA LINK
PHYSICAL PHYSICALPHYSICAL PHYSICAL
TRANSPORT TRANSPORT
SESSION SESSION
PRESENTATION PRESENTATION
APPLICATION APPLICATION
- Reassemble
Ethernet LANEthernet LAN WAN
Router Router
DATA
SENDER RECEIVER
April 12, 2023 29
NETWORK NETWORKNETWORK NETWORK
DATA LINK DATA LINKDATA LINK DATA LINK
PHYSICAL PHYSICALPHYSICAL PHYSICAL
TRANSPORT TRANSPORT
SESSION SESSION
PRESENTATION PRESENTATION
APPLICATION APPLICATION
Ethernet LANEthernet LAN WAN
Router Router
- Service-point addressingDATA
SENDER RECEIVER
A’s Chat window
B’s Chat window
April 12, 2023 30
NETWORK NETWORKNETWORK NETWORK
DATA LINK DATA LINKDATA LINK DATA LINK
PHYSICAL PHYSICALPHYSICAL PHYSICAL
TRANSPORT TRANSPORT
SESSION SESSION
PRESENTATION PRESENTATION
APPLICATION APPLICATION
Uses the session information to determine
which communication stream this data belongs
to.
Ethernet LANEthernet LAN WAN
Router Router
DATA
SENDER RECEIVER
April 12, 2023 31
NETWORK NETWORKNETWORK NETWORK
DATA LINK DATA LINKDATA LINK DATA LINK
PHYSICAL PHYSICALPHYSICAL PHYSICAL
TRANSPORT TRANSPORT
SESSION SESSION
PRESENTATION PRESENTATION
APPLICATION APPLICATION
- Decompression- Decryption - Translation
Ethernet LANEthernet LAN WAN
Router Router
DATA
SENDER RECEIVER
April 12, 2023 32
NETWORK NETWORKNETWORK NETWORK
DATA LINK DATA LINKDATA LINK DATA LINK
PHYSICAL PHYSICALPHYSICAL PHYSICAL
TRANSPORT TRANSPORT
SESSION SESSION
PRESENTATION PRESENTATION
APPLICATION APPLICATION
- The application layer reads the original command that the
application layer on the sender sent.
Ethernet LANEthernet LAN WAN
Router Router
DATA
SENDER RECEIVER
April 12, 2023 33
CONCLUSION
• The OSI model is more of a theoretical model. • The practical internet uses the TCP/IP model ..
April 12, 2023 34
1. Computer Network – A system approch- Larry L Peterson & Bruce S. Davie
2. Computer Networks(4th edition)- Tannenbaum
3. Data Communications and Networking (4th edition)- Behrouz A. Forouzan
4. http://en.wikipedia.org/wiki/OSI_model5. http://www.roseindia.net/technology/networking/osi.shtml 6. http://www.webopedia.com/quick_ref/OSI_Layers.asp7. http://www.tech-faq.com/osi-model.html
April 12, 2023 35
THAN
K YO
U