Introduction to Computer networks

2. Why computer network?
Sharing in resources, deliver communication services.
Classification of networks:
1- Size

3. 2- Topology

4. 3- Network Model (network architecture):
Peer to peer
Client server based

5. Network components:
1- Computers:
2- NIC: Network Interface Card
3- NOS: ex. Windows, Unix, Linux

6. 4- Media

7. 5- Network devices:
•Switch
•Router
•Firewall
•Access point
•IP telephony
•Modem

8. Network terminologies:
Port number:
Well-known ports: 0:1023
Randomly selected ports (dynamic): 1024: 65535
Network communication modes:
Connection oriented: slow, reliable
Connection-less: fast, not reliable

9. TCP/IP model

10. TCP/IP model

11. TCP/IP data flow