Network and System Security
Fortify servers, segment traffic, and implement enterprise-grade defensive controls
Learn how enterprise infrastructure defends itself. Cover TCP/IP packet handshakes, defensive port scanning, network segmentation, TLS cryptography, and practical Linux OS hardening under the principle of least privilege.
Course Specifications
Syllabus & Learning Rooms (8)
Progressive sequence of concept briefings, hands-on terminal flag challenges, and a capstone boss assessment.
TCP/IP and ports
Lesson BriefSYN, SYN-ACK, ACK handshakes and mapping listening service attack surfaces.
Scanning, defensively
Lesson BriefAuditing perimeter exposure before external adversaries map your network.
Lab: Read the scan report
Hands-on LabTriage nmap scan outputs to find high-risk exposed database services.
Firewalls, segmentation and VPNs
Lesson BriefZone isolation, egress filtering, and limiting breach blast radiuses.
Cryptography in practice
Lesson BriefSymmetric AES, asymmetric RSA/ECC, and TLS handshakes in production.
Lab: Pick the weak hash
Hands-on LabAudit algorithm configurations to eliminate obsolete MD5/SHA1 hashes.
Linux hardening and privilege
Lesson BriefSSH key enforcement, sudo rights auditing, and file permission locks.
Boss: Harden the server
Boss ChallengeFormulate an urgent remediation plan for a newly commissioned production host.
Skills You Will Master
Every concept is tested against real-world target scenarios, log files, or code repositories.
- TCP 3-way handshake mechanics and port state diagnosis
- Defensive network port scanning & exposed asset triage
- Firewall rule configuration & network segmentation
- Symmetric AES, asymmetric RSA/ECC, and TLS cryptographic protocols
- Cryptographic hash auditing (replacing obsolete MD5/SHA1)
- Linux server hardening, SSH key enforcement, and sudo privilege auditing
Prerequisites
- Basic familiarity with Linux command-line and networking concepts
Associated Career Roles
Devwalls Certified Network and Systems Defender
Upon completing all 8 rooms, you unlock the official proctor-free examination. Score 70% or higher to earn this credential, complete with LinkedIn integration, PDF generation, and public verification ID.
Frequently Asked Questions about Network and System Security
Will I learn how to protect real servers?
Yes. The concepts and lab configurations directly mirror production Linux deployments and cloud VPC architectures.
Ready to master Network and System Security?
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