Creating PDUs in Simulation Mode

Creating PDUs in Simulation Mode
Creating PDUs in Simulation Mode

In this article we will talk about Creating PDUs in Simulation Mode, and in previous article we already discussed about Mitigate VLAN Hopping Attacks.

You will learn how to use Packet Tracer’s powerful simulation mode. This mode allows you to verify device connectivity and to study how the various types of data traverse your network. Packet Tracer provides a Simulation mode that allows you to create and capture PDUs to check several functions within your network, such as:

  • Basic Connectivity – Can all devices communicate with each other?
  • Security – Are access lists functioning as designed?
  • Applications and Services – Are applications and services such as DNS, HTTP, and FTP functioning as designed?

The default mode for Packet Tracer is Realtime mode. In Realtime mode the time is continuously running as indicated by the clock in the lower right hand corner of the worksheet. In Simulation mode, time can be stopped or slowed to allow users to view data traffic one packet at a time. Simulation mode is used to observe network traffic in detail with time controlled directly by the user.

Click Play in the video to see how to use Simulation mode to create simple PDUs to replicate ICMP and ARP functionality and how to create more complex PDUs from a list of protocols such as DNS, HTTP, Telnet, SSH, FTP, and many more. Once the PDUs have been captured, you have several ways to view their contents. Viewing the contents of the PDUs can be used to verify connectivity, verify functionality, and troubleshoot issues. It is also a great tool for studying or reviewing the contents of the OSI model layers and the mechanisms of communication.

If viewed in OSI Model mode, you see a summary of the addresses and contents of the headers at each layer. If you select Inbound or Outbound PDU Details, the exact format of the appropriate headers is displayed.

For additional help and practice using Packet Tracer, please visit the Tutorials located under Help in the Packet Tracer program. To view some examples of how Packet Tracer can be used, select File, then Open Samples from the main menu.

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