VLAN Security Hardening: Protecting Your Layer 2 Network
VLANs provide segmentation, not security. Without explicit hardening — disabling DTP, fixing the native VLAN, enabling DHCP snooping and DAI — your Layer 2 network is wide open to attack.
Security
Latest posts
Private VLANs on Cisco Catalyst Switches: Isolated and Community Ports
Private VLANs let you enforce micro-segmentation within a single VLAN—isolating hosts completely or grouping them into communities while keeping them behind a single gateway IP.
DTP (Dynamic Trunking Protocol): How It Works and Why You Should Disable It
DTP lets switches negotiate trunk formation automatically—but this convenience comes with security risks that make disabling it a best practice in production networks.
Native VLAN Configuration and Security on Cisco Switches
Master native VLAN configuration on Cisco Catalyst switches, understand VLAN hopping attacks, and implement security best practices to protect your switched network.
Cisco ASA Cheat Sheet: Essential Commands for Network Administrators
Managing a Cisco Adaptive Security Appliance (ASA) can be challenging, especially when you’re under pressure to troubleshoot or configure network security. This cheat sheet is designed to help network administrators quickly find the most useful Cisco ASA commands, making
10 Cisco Port Audit Steps for Amazing Network Security
A thorough Cisco port audit is the foundation of robust network security and performance. In this comprehensive guide, you’ll master the essential techniques for auditing Cisco switch ports, from basic configuration checks to advanced security analysis. Our team of
802.1X on Cisco Switches: Step-by-Step Configuration Guide
Learn to configure 802.1X port-based network access control on Cisco switches — includes RADIUS setup, switch commands, troubleshooting, and best practices.