DNS Security: Filtering and Blocking Malicious Domains on the Router
Your router sees every DNS query on the network — which makes it the perfect place to block malware, phishing, and command-and-control domains before a device ever connects to them.
Cisco Router Hardening: A Baseline for Maximum Performance & Security
A hands-on baseline for taking a Cisco IOS router from box-fresh to production-ready — secure access, sane interfaces, routing, and the hardening steps most people skip.
Cisco ASAv Multi-DMZ Configuration and RIP Routing Architecture
A hands-on Cisco ASAv lab: stand up two isolated DMZ segments, publish a web server safely, contain the blast radius with security levels and ACLs, and run a RIPv2 routing architecture across the inside LAN — full config plus the tests that prove it works.
OSPF vs EIGRP: Choosing the Right Interior Routing Protocol
Both OSPF and EIGRP can route your internal network well — but they get there very differently. Here is a practical guide to picking the right one for your topology.