Sarah brings the analytical edge to IGNA Online. With deep experience in Cisco networking and a sharp eye on crypto markets, she writes detailed breakdowns of BGP, VLANs, IOS variants, blockchain technology, and edge computing platforms like NVIDIA Jetson.
STP and RSTP on Cisco IOS-XE explained in depth — root bridge placement, PortFast, BPDU Guard, Root Guard, Loop Guard, and a step-by-step troubleshooting workflow with real CLI command output.
Stop guessing who ran that change at 2am. This guide walks through configuring TACACS+ with Cisco ISE on IOS-XE — AAA method lists, command authorization, per-command accounting, and hardening steps with real CLI examples on Catalyst 9300 and ISR 4000.
Most enterprise networks still run dual-stack at best in 2026. This guide covers full IPv6 deployment on Cisco IOS-XE: addressing, OSPFv3, DHCPv6, ACLs, BGP, and the verification commands that actually tell you what’s broken — with real CLI output and production gotchas.
DMVPN Phase 2 enables direct spoke-to-spoke tunnels on demand, bypassing the hub after the initial NHRP resolution. This complete IOS-XE guide covers mGRE tunnel setup, NHRP configuration, EIGRP next-hop-self pitfalls, IPsec with IKEv2, verification commands, and the most common deployment gotchas.
A practical guide to diagnosing and fixing the most common OSPF adjacency failures on Cisco IOS-XE — MTU mismatches, timer conflicts, authentication errors, duplicate Router IDs, and flapping neighbors — with real show command output and CLI fixes.
Cisco’s Embedded Event Manager (EEM) is one of the most underutilized features in IOS-XE. This guide covers six practical EEM applets — from BGP peer monitoring and interface flap detection to nightly config backups and CPU spike capture — with real CLI syntax and Cat9K-specific tips.
Q1 2026 saw 34 DeFi protocols compromised for $169 million. We break down the dominant attack vectors — oracle manipulation, reentrancy, access control failures — the AI-powered exploit tools now threatening smart contracts, and what a proper 2026 security stack looks like for protocol developers, LPs, and researchers.
Most network engineers harden the data plane and forget the control plane — until an SNMP flood drops their OSPF adjacencies. This guide walks through a production-ready CoPP policy for Cisco IOS-XE, with real CLI templates, tuning guidance, and the show commands you need to verify it’s working.
QoS misconfigurations are the number-one cause of jittery voice calls and stuttering video in enterprise networks. This guide walks through a production-ready MQC QoS policy for Cisco IOS and IOS-XE — covering DSCP markings, LLQ, CBWFQ, NBAR2 classification, and the exact show commands you need to verify it’s working.
Stop logging into devices one by one. This hands-on guide covers Netmiko, NAPALM, and Nornir — the Python libraries that let network engineers automate Cisco IOS/IOS-XE tasks, parse show command output, push config changes, and run parallel jobs across hundreds of devices. Real code, real CLI examples, production-ready patterns.
BGP is the glue that holds the internet together — learn how it works, how to configure it on Cisco, and the security challenges it faces.
Jetson Orin Nano vs Raspberry Pi 5 — specs, AI performance benchmarks, power draw, and which board is right for your next project.
