1. 1 © 2004, Cisco Systems, Inc. All rights reserved. CCNA 2 v3.1 Module 10 Intermediate TCP/IP

2. 222 © 2004, Cisco Systems, Inc. All rights reserved. Objectives

3. 333 © 2004, Cisco Systems, Inc. All rights reserved. TCP Operation The transport layer is responsible for the reliable transport of and regulation of data flow from source to destination.

4. 444 © 2004, Cisco Systems, Inc. All rights reserved. Synchronization or Three-Way Handshake

5. 555 © 2004, Cisco Systems, Inc. All rights reserved. Denial-of-Service Attacks

6. 666 © 2004, Cisco Systems, Inc. All rights reserved. Simple Windowing

7. 777 © 2004, Cisco Systems, Inc. All rights reserved. TCP Sequence and Acknowledgment Numbers

8. 888 © 2004, Cisco Systems, Inc. All rights reserved. Positive ACK Acknowledgement is a common step in the synchronization process which includes sliding windows and data sequencing.

9. 999 © 2004, Cisco Systems, Inc. All rights reserved. Protocol Graph: TCP/IP

10. 10 © 2004, Cisco Systems, Inc. All rights reserved. UDP Segment Format

11. 11 © 2004, Cisco Systems, Inc. All rights reserved. Port Numbers

12. 12 © 2004, Cisco Systems, Inc. All rights reserved. Telnet Port Numbers

13. 13 © 2004, Cisco Systems, Inc. All rights reserved. Reserved TCP and UDP Port Numbers

14. 14 © 2004, Cisco Systems, Inc. All rights reserved. Ports for Clients Whenever a client connects to a service on a server, a source and destination port must be specified. TCP and UDP segments contain fields for source and destination ports.

15. 15 © 2004, Cisco Systems, Inc. All rights reserved. Port Numbering and Well-Known Port Numbers Port numbers are divided into three different categories: well-known ports registered ports dynamic or private ports

16. 16 © 2004, Cisco Systems, Inc. All rights reserved. Port Numbers and Socket

17. 17 © 2004, Cisco Systems, Inc. All rights reserved. Comparison of MAC addresses, IP addresses, and port numbers A good analogy can be made with a normal letter. The name on the envelope would be equivalent to a port number, the street address is the MAC, and the city and state is the IP address.

18. 18 © 2004, Cisco Systems, Inc. All rights reserved. Summary