1. Computer Network

2. Why Computer Network ???
Stand alone Computer ….
FOR WHAT ???

3. Something interesting from Computer Network ???
Easiness
No distance
Mobility
Efficient

4. Network Administrator,…
Advantages
Good salary
Control other peoples
Faster than others
Relax
Disadvantages
ERROR, then people want to kill YOU !!!

5. Open System Interconnection (OSI)
A model defines the stages or tasks of a protocol as it prepares to send data
Open meaning standards available to all.
The model is devided into seven distinct layers
Each subsequent layer should perform a well-defined function and the layer boundaries are designed to minimize the information flow across the interfaces

6. OSI Model Layers Application Layer Presentation Layer Session Layer
Provides a user interface (examples: HTTP, SMTP)
Includes file, print, database, app. Services
Presentation Layer
Presents the data (example: JPEG)
Includes encryption, compression and translation services
Session Layer
Keeps different applications data separate

7. OSI Model Layers Transport Layer Network Layer
Provides reliable delivery
Performs error detection
Includes end to end connection
Network Layer
Provides logical addressing
Routing layer

8. OSI Model Layers Data Link Layer Physical Layer
Combines packets into bytes then into frames
Performs error detection (not correction)
Provides Media access addressing (point-to-point)
Media Access Control and Data Link Control
Physical Layer
Moves bits between devices

9. Keys Layers of the OSI Model

10. OSI Model and Protocols

11. Network Devices
Wire
Wireless

12. Router, Switch, Hub, Modem, …

13. TCP/IP

14. TCP/IP

15. Network Security
Firewall

16. Operating Systems

17. IPX - Internet Protocol Exchange (networking)
RIP - Routing Information Protocol
IGRP - Interior Gateway Routing Protocol (Cisco Systems routing protocol)
OSPF - Open Shortest Path First

18. Server - Client

19. Certificate

20. Thank You… IPX - Internet Protocol Exchange (networking)
RIP - Routing Information Protocol
IGRP - Interior Gateway Routing Protocol (Cisco Systems routing protocol)
OSPF - Open Shortest Path First
Thank You…