1. Data transfer through the internet (OSI Model)
(Open Systems Interconnection model)

2. Outline Introduction. Objective. The Seven Layers of OSI.
How the seven layers work
IP and Mac transition
Conclusion

3. Introduction
when you chat to somebody on the Net or send them an , do you ever stop to think how many different computers you are using in the process? There's the computer on your own desk, of course, and another one at the other end where the other person is sitting, ready to communicate with you. But in between your two machines, making communication between them possible, there are probably about a dozen other computers bridging the gap. Collectively, all the world's linked-up computers are called the Internet. How do they talk to one another? Let's take a closer look!

4. Objective
How data transfer through internet

5. The Seven Layers of the OSI Model
Define how the applications within the end stations will communicate with each other
Lesson Aim
<Enter lesson aim here.>
Define how data is transmitted end to end.

6. https Client Receiver Server Sender Public Internet Need google.com
Port (xxxx)
Port 443
Server
Sender
Public Internet
Need google.com
https Port 443
Lesson Aim
<Enter lesson aim here.>
Router
Client
Client

7. How the seven layers work ?

8. Client
Server
Router

9. www.google.com L7 L6 L5 Example protocols Provides a user interface
Sender
Data
Example protocols
Provides a user interface
https, http, DNS, FTP, Telnet L7
Port () D
Port (XX, 443 )
https
Presents data.
Data translation and formatting L6
SSL, SSH A P D
Keeps different applications’ data separate
Dialog control between devices (PPTP). L5
Netbios, PPTP S A P D

10. L4 L3 L2 L1 P P P Segment P IP, ICMP, EIGRP, OSPF P Packet Frame BitsD
Reliable or unreliable delivery.
Error correction. L4
TCP, UDP
TCP S A P D
Segment
IP, ICMP, EIGRP, OSPF L3
Provides logical addressing. IP T S A P D
Packet
access to media using MAC address.
Error detection. L2
ARP, RARP, PPP
MAC N T S A P D
Frame
Specifies voltage, wire speed.
Move bits. L1
DSL, , Ethernet 01 D N T S A P
Bits
Router

11. IP and Mac transition Public Internet Ip source S Mac A1 Mac A2 Mac B2
Mac C1
Ip_Destination D
Mac C2

12.
Port 443
TCP
Ip4_D
Mac C2

13. Conclusion
The Seven Layers of the OSI Model is responsible for transferring data through the internet .
We saw how the data processed through transmissions .
The IP address of the source and destination is constant but the Mac address is varied from machine to another.

14. Thank You