aaronfs07 / 9linedefense-knowledge

A Place for people to write and share knowledge for public use.

9 Line Defense Knowledge Base

A Github respository for Updating the knowledgebase site https://knowledge.9linedefense.com

Go there and check it out!

• All documents are written in Markdown format
• To contribute please request permission to this repository and then make your own pull request

Where does the name come from?

9 Line Defense comes from my personal philosophy of having a layered defense in IT. One of those layers being Knowledge. Knowledge is they key to growth and sharing this knowledge becomes important to our new people coming into IT/Cyber Security. This projects goal is share knowledge in the most efficient method possible. I find that those in the technology space are not as extroverted as those in other fields and we tend to love our guides and subreddits. I put this together to allow for a central repository of guides that can also be taken offline, for instance if you work in the government where Air Gapped Networks are common.

What are the 9 Lines of Defense

This is by far a personal philosophy of managing teams. No one person can be good at everything however everyone can provide something. I firmly believe that if these 9 Tenants are followed in an IT/Cyber Team than you can not go wrong. This site is embodying the 1st and 2nd of those tenants.

1. Smart & Inquisitive Technicians
2. Thorough & Often Training
3. Competant & Truthful Vendors
4. Ambition
5. Configuration Management
6. Right tools for the Job
7. Plan for the Worst
8. Lifecycle Management
9. Scoped Teams

9linedefense-knowledge's Issues

WDS Guide Project

Create a Guide for setting up a Windows Deployment Server from scratch.

Microsoft: Group Policy Explainer

This is to create an explainer that will explain and review GPOs and how to properly create them.

• A General GPO Explainer
• Requirements to use Group Policy
• GPO Best Practices up front
• Installing Software with Group Policy
• Managing Security with Group Policy
• Loading Administrative Templates
• Managing Users and Computers with Group Policy

Proxy Explainer

• How to configure proxy as well as common practices or troubleshooting procedures to make it work as it should. Include how to open and configure Java to clear the temp internet files so that Proxy will download and open.

Firewall Rules and more

Correct configuration of firewall rules. What rules are dumb and to not have any any rules in place.
Also how to configure interfaces and create routing tables that are on the firewall VLAN in the event that there is not a physical firewall with the server hardware.

Cisco iOS Command Cheat Sheet

Cheat Sheet for Cisco iOS Commands.

Create Switch routes

How to create correct switch routes so that the switch or switches know the correct location to send traffic.

Subnetting cheat sheet

Create an explainer doc of subnetting and how it works.

Image Updates

Update all images to ensure they display correctly in the source of the files both locally and on the main site.