Add content to linux nodes (#6489)

* Update dns.md - Fix the YouTube video link error and update the video title.

* Update understand-cia-triad.md

* Update comptia-security.md

- Fix all broken links.
- Update Exam Details.
- Add new links.
- Remove outdated links.

* Update comptia-network.md

- Update Exam Details.
- Preparation Resources.
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* Update dnssec.md

- summarized content.
- relevant links.

* Update apt.md

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* Update comptia-a.md

- Updated Professor Messer's link
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* Apply suggestions from code review

* Update attck.md

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* Update src/data/roadmaps/cyber-security/content/attck@auR7fNyd77W2UA-PjXeJS.md

* Update linux.md, comptia-linux.md and understand-the-osi-model.md

Update linux.md
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Update comptia-linux.md
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Update understand-the-osi-model.md
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* Update cissp.md

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* Update src/data/roadmaps/cyber-security/content/cissp@BqvijNoRzSGYLCMP-6hhr.md

* update basics-of-ids-and-ips.md

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* update endpoint-security.md

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* update edr.md
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update ssl-and-tls-basics.md
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update dropbox.md
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* ipsec.md
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kali-linux.md
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linux.md
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* Update src/data/roadmaps/cyber-security/content/kali-linux@w6wXkoLrv0_d-Ah0txUHd.md

---------

Co-authored-by: dsh <daniel.s.holdsworth@gmail.com>
Co-authored-by: Kamran Ahmed <kamranahmed.se@gmail.com>
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André Oliveira 3 months ago committed by GitHub
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# IPSec
IPSec, which stands for Internet Protocol Security, is a suite of protocols used to secure Internet communications by encrypting and authenticating IP packets. It is commonly utilized in Virtual Private Networks (VPNs) to ensure that data transmitted over public networks is not accessible to unauthorized individuals. IPSec operates by encrypting data at the source and decrypting it at the destination, maintaining the confidentiality and integrity of the data while in transit. Additionally, it provides authentication, ensuring that the data is being sent and received by the intended parties. This protocol suite is versatile as it can be used with both IPv4 and IPv6 networks, making it a fundamental component for secure online communication.
- [@video@IP Sec VPN Fundamentals](https://www.youtube.com/watch?v=15amNny_kKI)

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# Kali Linux
Kali Linux is a specialized Linux distribution that is designed for penetration testing, security auditing, and related information security tasks. Originating from the Debian distribution, Kali Linux is equipped with a vast array of tools that are used for ethical hacking purposes. It is an open-source project that provides users with the means to test the security of systems and networks by simulating attacks in a controlled environment.
## Tools
With over 600 pre-installed penetration-testing programs, Kali Linux offers tools for various security-related tasks, such as network analysis, vulnerability scanning, and forensic analysis. Its development is overseen by Offensive Security, a company known for their contributions to the field of information security. Kali Linux is highly customizable, allowing users to tailor the system to their specific needs, and supports a wide range of hardware platforms. It is a powerful resource for professionals in the cybersecurity field, as well as for those who are passionate about learning and practicing ethical hacking techniques.
- [@official@Kali Linux](https://www.kali.org/)

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By understanding Linux's features and best practices, you can leverage its powerful capabilities and robust security features to enhance your computing environment's performance and safety.
Recommended resources include:
- [@article@Learn Linux](https://linuxjourney.com/)
- [@video@Linux in 100 Seconds](https://www.youtube.com/watch?v=rrB13utjYV4)
- [@video@Introduction to Linux](https://youtu.be/sWbUDq4S6Y8)
- [@article@Linux Commands Cheat Sheet](https://cdn.hostinger.com/tutorials/pdf/Linux-Commands-Cheat-Sheet.pdf)
- [@course@Linux from scratch- Cisco](https://www.netacad.com/courses/os-it/ndg-linux-unhatched)
- [@course@Linux from scratch - Cisco](https://www.netacad.com/courses/os-it/ndg-linux-unhatched)
- [@feed@Explore top posts about Linux](https://app.daily.dev/tags/linux?ref=roadmapsh)

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