Based on your query, the best tool for you would be Kahoot!.

Kahoot! is a game-based learning platform that allows you to create, share, and play learning games or trivia quizzes. It's designed to make learning fun and engaging for any subject, including network security.

The Game Creation feature allows you to create games from scratch, use a question bank, edit a template, or customize existing games. You can add videos, images, and diagrams to your questions to increase engagement. This feature would be particularly useful for creating a Kahoot on network security, as you can tailor the questions to your specific lesson content.

Kahoot! also has an AI-Powered Question Generator. You can enter your topic of interest, in this case, network security, and the AI will automatically generate relevant questions. This can save you time in content creation and ensure that your Kahoot is comprehensive and tailored to your lesson.

The Sharing and Collaboration feature allows you to share games with other teachers and encourage students to create their own games. This could be a great way to encourage student engagement and peer learning in your network security lessons.

Kahoot! offers a free Basic plan for K-12 teachers and students. For more advanced features, there are several paid plans. The Pro plan costs $3.99 per teacher per month, the Premium plan is $7.99 per teacher per month, and the Premium+ plan is $9.99 per teacher per month.