Add content to Linux roadmap (#6361)

* 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- Remove outdated links.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.
- New links.

* Update dnssec.md

- summarized content.
- relevant links.

* Update apt.md

- New section
- Added a new link

* Update comptia-a.md

- Updated Professor Messer's link
- New links added

* Apply suggestions from code review

* Update attck.md

- new content.
- relevant links.

* 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
- New Links
- Remove Google Analytics parameters from link

Update comptia-linux.md
- Links updated

Update understand-the-osi-model.md
- New link

---------

Co-authored-by: dsh <daniel.s.holdsworth@gmail.com>
Co-authored-by: Kamran Ahmed <kamranahmed.se@gmail.com>

src/data/roadmaps/cyber-security/content/comptia-linux@p34Qwlj2sjwEPR2ay1WOK.md

@@ -51,4 +51,6 @@ CompTIA provides a range of study materials and resources, including:
 
 The CompTIA Linux+ certification is an excellent starting point for aspiring Linux professionals, as it validates essential skills required for entry-level Linux administration roles. By obtaining this certification, you can enhance your career prospects and demonstrate your competence to potential employers. So, buckle up and start your Linux journey with the CompTIA Linux+ certification!
 
-- [@article@Linux Basics](https://linuxjourney.com/)
+- [@oficial@Official CompTIA Linux+](https://www.comptia.org/certifications/linux)
+- [@video@CompTIA Linux+ Exam Prep (XK0-005 revision)](https://youtube.com/playlist?list=PL78ppT-_wOmuwT9idLvuoKOn6UYurFKCp&si=0OAFuOOsjko8Gg61)
+- [@course@Dion Training](https://www.udemy.com/course/comptia-linux/)

src/data/roadmaps/cyber-security/content/linux@4frVcjYI1VlVU9hQgpwcT.md

@@ -33,6 +33,8 @@ While Linux is inherently secure, there are best practices to enhance your syste
 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.
 
 - [@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?_ga=2.100546909.2114439087.1713515209-1230351550.1713515209)
+- [@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)
 - [@feed@Explore top posts about Linux](https://app.daily.dev/tags/linux?ref=roadmapsh)

src/data/roadmaps/cyber-security/content/understand-the-osi-model@OXUd1UPPsBhNoUGLKZJGV.md

@@ -36,5 +36,6 @@ Each of these layers interacts with the adjacent layers to pass data packets bac
 
 In the next section, we will discuss network protocols and how they play an essential role in network communication and security.
 
-- [@video@What is OSI Model?](https://www.youtube.com/watch?v=Ilk7UXzV_Qc&ab_channel=RealPars)
+- [@video@What is OSI Model?](https://www.youtube.com/watch?v=Ilk7UXzV_Qc)
 - [@video@Lecture - OSI Model](https://www.youtube.com/watch?v=0Rb8AkTEASw)
+- [@video@OSI Model Animation](https://www.youtube.com/watch?v=vv4y_uOneC0)