# System Admin

### How do you change your DNS settings in Linux/Windows?

Windows: Internet adapter/

Linux: sudo nano /etc/resolv.conf add nameserver x.x.x.x

### Cyber Crime vs Cyber-enabled crime

Cyber-enabled crime: traditional crime that is amplified by the use of computer tech

Cyber Crime: illegal action involving network or computer where it used to commit the crime

### What is the main goal of information security within an organization or company?

Protect CIA (Confidentiality, Integrity, Availability)

### What are the consequences of a cyber-attack?

### First step of securing Linux Server

Auditing: A system scan is performed using a tool called Lynis for auditing. Every category is scanned separately and the hardening index is provided to the auditor for further steps.

Hardening: After the audit is complete, the system is hardened depending on the level of security it further needs. It is an important process based on the decision of auditor.

Compliance: The system needs to be checked almost every day for better results and also lesser threats from security point of view.

### How to secure a Web Server

- Anti-virus and firewalls
- Safe installation and configuration of the web server software
- Secure installation and configuration of the O.S
- Scanning system vulnerability
- Remote administration disabling
- Removing of unused and default account
- Changing of default ports and settings to customs port and settings
- Update/Patch the web server software
- Update Permissions/Ownership of files
- Delete default data/scripts
- Remove or protect hidden files and directories
- Web Application and Web Server Security
- Minimize the server functionality disable extra modules
- Increase logging verboseness
- Configured to display generic error messages
- Make sure Input Validation is enforced within the code: Security QA testing
- Implement a software security policy