OSI reference model 7-layers

1. OSIMODEL
Course:VP-CTL
NE7-2
MousakadhemAlsaeed
202624003
Assessor:Mr.MohammedElmaghari
SubmittingDate:26/10/2017

2. 1. Introduction
2. (LO1) Define the OSI models.
3. (LO2) Understand why are layering.
4. (LO3) Describe the 7-layers.
5. (LO4) Understand each layer and the
encapsulation process.
6. (LO5) list the different between TCP & UDP
protocols
7. Review
8. summary

4. • What is OSI model stands for?
• Who established OSI model
• What is the main porous for OSI?

5. • For represent a perfect network.
• For organize the network into well defined,
documented, functional modules, in the layered
network.
• Each layer provides specific functionality or
services to the neighboring layer.
• Allows different hardware and software to work
together.
• Essay for Troubleshooting. [1]
• DO YOU TINK TERE IS ANOTHER BENIFT FOR OSI MODEL?

6. What are the 7-layers?

7. 7 Application
6 Presentation
5 Session
4 Transport
1 Physical
2 Data Link
3 Network
Interface application.
Allow the users access to network resources.
ENC: Determine the type of application or
protocol that the user use. presentation
 Protocols:
o HTTP, FTP, SMTP, Telnet.
 Devices:
o PC, Servers, Mobile Phones.

8. 7 Application
6 Presentation
5 Session
4 Transport
1 Physical
2 Data Link
3 Network
 ENC: Present data (convert data to ASKII
code)
 ENC: Compression- decompression.
 ENC: Encryption- decryption.  Session

9. 7 Application
6 Presentation
5 Session
4 Transport
1 Physical
2 Data Link
3 Network
 Setup path
 Mange path
 End path
 ENC: Create the data stream
 Data stream:01110101011111111100010101000010101
 Send to Transport

10. 7 Application
6 Presentation
5 Session
4 Transport
1 Physical
2 Data Link
3 Network
 ENC: Divide the data stream into segments
segment.
 ENC: Specifies the type of protocol.
  segments send to network
 Protocols:
o UDP
o TCP

11. 7 Application
6 Presentation
5 Session
4 Transport
1 Physical
2 Data Link
3 Network
 Best way to move data.
 ENC: Add the Ip address.
 ENC: Convert the segments to packet.
send the packet to data link
 Protocols:
o Routing (RIP, OSPF, EIGRP, BGP)
o IP: Internet Protocol.
 Devices: Routers, Firewalls.

12. 7 Application
6 Presentation
5 Session
4 Transport
1 Physical
2 Data Link
3 Network
 ENC: LLC: frame network layer. Convert
the packet to frame
 ENC: LLC: network layer protocol.
Determine the protocol based on WAN or
LAN.
 ENC: MAC: address the frame. Add MAC
 ENC: MAC: make H. and T. physical
 Protocol:
o MAC - Media Access Control.
 Devices:
o Switches.
o Bridges.

13. 7 Application
6 Presentation
5 Session
4 Transport
1 Physical
2 Data Link
3 Network
 ENC: Encapsulate the data and Send it or
receive it into bits
 Devices:
 Hubs.
 Media: Coax, Fiber, Twisted Pair.

15. User datagram protocol (UDP) Transmission control protocol
(TCP)
Under layer 4 Under layer 4
Byte stream is broken up into
segments.
Byte stream is broken up into
segments.
Connectionless Connection-oriented
Unreliable Reliable
Fast Slow
Example: voice Example: Files, telnet, HTTP
No detect error Detect error
No acknowledgment massages Require acknowledgment massages

17. • The communication between devices inside the
network must work with Protocols.
• OSI makes the devices connect with each other.
• OSI model is divided into 7 layers.
• Each layer has its own functions.
• The 7 layers interact with each other.

20. [1] Zimmermann, H. (1980). OSI reference model--The ISO model of
architecture for open systems interconnection. IEEE Transactions on
communications, 28(4), 425-432.
[2] Handel, T. G., & Sandford, M. T. (1996, May). Hiding data in the OSI
network model. In International Workshop on Information Hiding (pp.
23-38). Springer, Berlin, Heidelberg.
[3] Jacobson, V. (1990). Compressing TCP/IP headers for low-speed
serial links.