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Add sections to `code4yo_com.ipynb` to monitor network traffic, implement firewall rules, usage policies, audit user activities, and use Colab's logging features.

* **Monitor Network Traffic**
  - Add a markdown cell to introduce monitoring network traffic using `tcpdump`.
  - Add a code cell to install and run `tcpdump`.

* **Implement Firewall Rules**
  - Add a markdown cell to introduce implementing firewall rules to block torrent-related activities.
  - Add a code cell to add `iptables` rules to block torrent-related ports.

* **Implement Usage Policies**
  - Add a markdown cell to introduce usage policies that explicitly prohibit torrent downloads.
  - Add a markdown cell to state the policy prohibiting torrent downloads.

* **Audit and Review User Activities**
  - Add a markdown cell to introduce regular audits and reviews of user activities.
  - Add a code cell with example code to review user activities from log files.

* **Use Colab's Logging and Monitoring Features**
  - Add a markdown cell to introduce using Colab's built-in logging and monitoring features.
  - Add a code cell with example code to use Colab's logging features to track network activity.

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For more details, open the [Copilot Workspace session](https://copilot-workspace.githubnext.com/akaday/..github?shareId=XXXX-XXXX-XXXX-XXXX).

Add network monitoring and restrictions in Colab

Signed-off-by: aka <[email protected]>

Update code4yo_com.ipynb

Add customization for `tcpdump` to filter specific traffic in `code4yo_com.ipynb`.

* Add a markdown cell with the title "Customizing tcpdump to Filter Specific Traffic".
* Add a code cell to demonstrate filtering traffic by host, port, and protocol using `tcpdump`.
* Add a markdown cell with the title "Combining Filters in tcpdump".
* Add a code cell to demonstrate combining multiple filters using logical operators in `tcpdump`.

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For more details, open the [Copilot Workspace session](https://copilot-workspace.githubnext.com/akaday/..github?shareId=XXXX-XXXX-XXXX-XXXX).

Customize tcpdump to filter specific traffic