Cisco VLAN Trunking: Configuration and Troubleshooting
A practical guide to configuring and troubleshooting VLAN trunking on Cisco switches, with real-world commands and diagnostic techniques.
Windows Server • Cisco • Linux • Python • PowerShell • Security • Training
A practical guide to configuring and troubleshooting VLAN trunking on Cisco switches, with real-world commands and diagnostic techniques.
A practical guide to tuning Linux kernel parameters using sysctl for network performance, memory management, and system stability.
A practical guide to automating Cisco CLI commands using Python and the Netmiko library for network engineers.
A practical guide to diagnosing and fixing Group Policy application issues in Active Directory environments.
A practical Windows Server hardening checklist for 2026: patching, AD/GPO baselines, RDP protection, firewall rules, logging, accounts, and monitoring.
Step-by-step troubleshooting guide to fix Windows Active Directory authentication failures caused by DNS misconfiguration. Practical commands and permanent solutions.
A practical guide for security and infrastructure engineers to analyze SMTP traffic in Wireshark and identify protocol behavior, configuration issues, and exposure points.
Build a simple SMTP testing lab using Telnet and Wireshark to understand EHLO, SMTP commands, and mail traffic inspection.
Practical lab using Nmap to enumerate SMTP servers and analyze EHLO capabilities for infrastructure auditing and security validation.
Practical PowerShell commands for network administrators including DNS checks, Active Directory queries, connectivity tests and remote management.
A practical engineer-focused guide to Nmap scanning techniques, performance tuning, and enterprise use cases.
Step-by-step guide to diagnose and fix Active Directory replication failures using repadmin, dcdiag and built-in Windows Server tools.