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

222 © 2004, Cisco Systems, Inc. All rights reserved. Purpose of This PowerPoint This PowerPoint primarily consists of the Target Indicators (TIs) of this module in CCNA version 3.1. It was created to give instructors a PowerPoint to take and modify as their own. This PowerPoint is: NOT a study guide for the module final assessment. NOT a study guide for the CCNA certification exam. Please report any mistakes you find in this PowerPoint by using the Academy Connection Help link.

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444 © 2004, Cisco Systems, Inc. All rights reserved. Objectives

555 © 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.

666 © 2004, Cisco Systems, Inc. All rights reserved. Synchronization or Three-Way Handshake

777 © 2004, Cisco Systems, Inc. All rights reserved. Denial-of-Service Attacks

888 © 2004, Cisco Systems, Inc. All rights reserved. Simple Windowing

999 © 2004, Cisco Systems, Inc. All rights reserved. TCP Sequence and Acknowledgment Numbers

10 © 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.

11 © 2004, Cisco Systems, Inc. All rights reserved. Protocol Graph: TCP/IP

12 © 2004, Cisco Systems, Inc. All rights reserved. UDP Segment Format

13 © 2004, Cisco Systems, Inc. All rights reserved. Port Numbers

14 © 2004, Cisco Systems, Inc. All rights reserved. Telnet Port Numbers

15 © 2004, Cisco Systems, Inc. All rights reserved. Reserved TCP and UDP Port Numbers

16 © 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.

17 © 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

18 © 2004, Cisco Systems, Inc. All rights reserved. Port Numbers and Socket

19 © 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.

20 © 2004, Cisco Systems, Inc. All rights reserved. Summary