Technical essays, hands-on security labs, system architecture, and defensive engineering research by Kenneth Nnorom.https://kennethnnorom.com/en-usdagera07@gmail.com (Kenneth Nnorom)dagera07@gmail.com (Kenneth Nnorom)Copyright 2026 Kenneth Nnoromhttps://kennethnnorom.com/logo-mark-dark.pnghttps://kennethnnorom.comhttps://kennethnnorom.com/labs/how-to-build-a-lightweight-network-sla-monitoring-platform-with-python/https://kennethnnorom.com/labs/how-to-build-a-lightweight-network-sla-monitoring-platform-with-python/Network visibility isn’t just a nice-to-have; it’s essential for keeping operations running smoothlyThu, 04 Jun 2026 00:00:00 GMTNetwork Automationdagera07@gmail.com (Kenneth Nnorom)https://kennethnnorom.com/articles/the-nigeria-data-breach-story-of-2026-what-sterling-bank-remita-and-bytetobreach-teach-every-business-about-security/https://kennethnnorom.com/articles/the-nigeria-data-breach-story-of-2026-what-sterling-bank-remita-and-bytetobreach-teach-every-business-about-security/The Nigerian data breach story of 2026 did not arrive as a Hollywood-style cyberattackTue, 07 Apr 2026 00:00:00 GMTIncident Analysisdagera07@gmail.com (Kenneth Nnorom)https://kennethnnorom.com/labs/building-a-site-to-site-ipsec-vpn-a-practical-lab-guide/https://kennethnnorom.com/labs/building-a-site-to-site-ipsec-vpn-a-practical-lab-guide/Introduction: Why Do We Need VPNs? The internet is fundamentally a wild, untrusted placeMon, 30 Mar 2026 00:00:00 GMTNetwork Securitydagera07@gmail.com (Kenneth Nnorom)https://kennethnnorom.com/labs/building-an-enterprise-soc-visibility-lab-network-security-for-smes-in-nigeria/https://kennethnnorom.com/labs/building-an-enterprise-soc-visibility-lab-network-security-for-smes-in-nigeria/Most enterprise security guides assume you have an unlimited budget and a massive operations teamSun, 29 Mar 2026 00:00:00 GMTSecurity Operationsdagera07@gmail.com (Kenneth Nnorom)https://kennethnnorom.com/labs/building-a-resilient-multi-vendor-data-centre-fabric-a-cumulus-mlag-and-vrr-deep-dive/https://kennethnnorom.com/labs/building-a-resilient-multi-vendor-data-centre-fabric-a-cumulus-mlag-and-vrr-deep-dive/I have been spending quite a bit of my time labing on different data centre design models, and let's just say it has been a really exciting journeySun, 15 Mar 2026 00:00:00 GMTData Centre & Clouddagera07@gmail.com (Kenneth Nnorom)https://kennethnnorom.com/labs/configuring-interface-level-ospf-on-cisco-and-cumulus-linux/https://kennethnnorom.com/labs/configuring-interface-level-ospf-on-cisco-and-cumulus-linux/Building a lab is one thing; making two different networking "philosophies" talk to each other is another game entirelyWed, 11 Mar 2026 00:00:00 GMTData Centre & Clouddagera07@gmail.com (Kenneth Nnorom)https://kennethnnorom.com/articles/the-t-shaped-engineer-an-engineers-guide-to-law-in-nigeria/https://kennethnnorom.com/articles/the-t-shaped-engineer-an-engineers-guide-to-law-in-nigeria/The Day a Router Command Became a Civil Rights Issue In June 2021, ISPs received directives across Nigeria to block Twitter at the network layerMon, 17 Nov 2025 00:00:00 GMTEngineering & Lawdagera07@gmail.com (Kenneth Nnorom)https://kennethnnorom.com/articles/cost-of-cheap-it/https://kennethnnorom.com/articles/cost-of-cheap-it/In my experience, especially with Nigerian Small and Medium-sized Businesses (SMBs), there's a common "cost-saving" strategy that is, quite frankly, a persisten...Fri, 07 Nov 2025 00:00:00 GMTTechnical Strategydagera07@gmail.com (Kenneth Nnorom)https://kennethnnorom.com/labs/cumulus-linux-a-guide-to-l2-data-centre-fabrics/https://kennethnnorom.com/labs/cumulus-linux-a-guide-to-l2-data-centre-fabrics/In an era where infrastructure is code, some aspects of networking still feel like a black box? Proprietary networking platforms, such as Cisco's IOS, Juniper's...Thu, 30 Oct 2025 00:00:00 GMTData Centre & Clouddagera07@gmail.com (Kenneth Nnorom)https://kennethnnorom.com/articles/smartphone-design-philosophy-how-apple-google-and-samsung-differ/https://kennethnnorom.com/articles/smartphone-design-philosophy-how-apple-google-and-samsung-differ/In the high-stakes world of smartphones, three titans, Apple, Google, and Samsung, have taken starkly different paths to innovation, each with its own smartpho...Sun, 14 Sep 2025 00:00:00 GMTSystems & Hardwaredagera07@gmail.com (Kenneth Nnorom)https://kennethnnorom.com/labs/network-point-of-failure-a-definitive-guide-to-hsrp-and-stp/https://kennethnnorom.com/labs/network-point-of-failure-a-definitive-guide-to-hsrp-and-stp/Imagine you've built a sleek, high-performance network, only for a single router or switch to fail and bring the entire thing downMon, 08 Sep 2025 00:00:00 GMTNetwork Architecturedagera07@gmail.com (Kenneth Nnorom)https://kennethnnorom.com/articles/outsourcing-consulting-in-nigeria-a-security-engineers-view-from-the-inside/https://kennethnnorom.com/articles/outsourcing-consulting-in-nigeria-a-security-engineers-view-from-the-inside/As a Network Security Engineer, my day-to-day is a fight against cyber threatsFri, 27 Jun 2025 00:00:00 GMTGovernance & Policydagera07@gmail.com (Kenneth Nnorom)https://kennethnnorom.com/labs/ospf-routing-protocol-part-3-multi-area-ospf/https://kennethnnorom.com/labs/ospf-routing-protocol-part-3-multi-area-ospf/In this part of our OSPF troubleshooting series, I redesigned the topology to include three areas: Area 0 (the backbone), Area 1, and Area 2Mon, 19 May 2025 00:00:00 GMTRouting & Protocolsdagera07@gmail.com (Kenneth Nnorom)https://kennethnnorom.com/labs/ospf-routing-protocol-part-2/https://kennethnnorom.com/labs/ospf-routing-protocol-part-2/DOWNLOAD PACKET TRACER FILE To make this lesson easier to follow, I've included the Packet Tracer file for downloadThu, 15 May 2025 00:00:00 GMTRouting & Protocolsdagera07@gmail.com (Kenneth Nnorom)https://kennethnnorom.com/labs/how-to-configure-firewall-rules-on-pfsense/https://kennethnnorom.com/labs/how-to-configure-firewall-rules-on-pfsense/Having installed the pfSense firewall, it's crucial to establish firewall rules that safeguard your network's perimeterSat, 07 Dec 2024 00:00:00 GMTPerimeter Defensedagera07@gmail.com (Kenneth Nnorom)https://kennethnnorom.com/articles/budget-friendly-cybersecurity-tips-for-small-businesses-in-nigeria/https://kennethnnorom.com/articles/budget-friendly-cybersecurity-tips-for-small-businesses-in-nigeria/The landscape of global threats is ever-evolving, with cyberattacks becoming more frequent and sophisticatedThu, 26 Sep 2024 00:00:00 GMTCybersecurity Strategydagera07@gmail.com (Kenneth Nnorom)https://kennethnnorom.com/labs/ospf-routing-protocol-part-1/https://kennethnnorom.com/labs/ospf-routing-protocol-part-1/From the last session , we successfully configured all the router interfaces and the switch with the IP addresses we generated while learning about subnettingMon, 23 Sep 2024 00:00:00 GMTRouting & Protocolsdagera07@gmail.com (Kenneth Nnorom)https://kennethnnorom.com/articles/the-guide-to-wi-fi-network-design-strategies-for-success/https://kennethnnorom.com/articles/the-guide-to-wi-fi-network-design-strategies-for-success/Recall the days when our homes or offices were cluttered with tangled wires, restricting our movements and tying us to fixed locationsWed, 08 May 2024 00:00:00 GMTNetwork Architecturedagera07@gmail.com (Kenneth Nnorom)https://kennethnnorom.com/labs/connecting-the-switchs-to-the-routers-and-initial-configurations/https://kennethnnorom.com/labs/connecting-the-switchs-to-the-routers-and-initial-configurations/We're ready to start linking the switches to our networks, even though we have yet to configure the routes on the routersFri, 08 Mar 2024 00:00:00 GMTNetwork Designdagera07@gmail.com (Kenneth Nnorom)https://kennethnnorom.com/labs/how-to-configure-router-interface-ip-in-packet-tracer/https://kennethnnorom.com/labs/how-to-configure-router-interface-ip-in-packet-tracer/Building on the previous post, I trust you've successfully set up the infrastructure by linking the routers in Cisco Packet Tracer following the provided steps ...Wed, 27 Dec 2023 00:00:00 GMTNetwork Designdagera07@gmail.com (Kenneth Nnorom)https://kennethnnorom.com/labs/guide-to-choosing-and-setting-up-routers-in-packet-tracer/https://kennethnnorom.com/labs/guide-to-choosing-and-setting-up-routers-in-packet-tracer/Building upon the foundational concepts of Network design covered in the previous lesson , where we delved into the intricacies of subnetting IPv4 addresses to...Sat, 02 Dec 2023 00:00:00 GMTNetwork Designdagera07@gmail.com (Kenneth Nnorom)https://kennethnnorom.com/labs/how-to-install-pfsense-firewall-on-virtualbox/https://kennethnnorom.com/labs/how-to-install-pfsense-firewall-on-virtualbox/PfSense stands out as an open-source firewall based on FreeBSD, earning its reputation as my top choice for live deployment in medium to small-scale enterprises...Thu, 09 Nov 2023 00:00:00 GMTPerimeter Defensedagera07@gmail.com (Kenneth Nnorom)https://kennethnnorom.com/labs/how-to-design-a-campus-network-ipv4-subnetting/https://kennethnnorom.com/labs/how-to-design-a-campus-network-ipv4-subnetting/In this blog series, I will guide you through the steps of creating a campus network using Cisco Packet TracerWed, 08 Nov 2023 00:00:00 GMTNetwork Designdagera07@gmail.com (Kenneth Nnorom)