OSI vs TCP/IP Layer Mapping - A Cheat Sheet for the N10-009 Exam
OSI 7-layer model mapped to the TCP/IP 4-layer model with every protocol, PDU name, and exam-trap clarified. The cheat sheet that turns layer questions into …
Posts
Check Point VPN Zero-Day CVE-2026-50751 - Qilin Exploits
CVE-2026-50751 Check Point VPN IKEv1 auth bypass exploited by Qilin ransomware. Plus Chrome's fifth zero-day and a UniFi unauthenticated root chain.
Cisco ISE Read-Only Audit - Run It Yourself in 5 Minutes
Step-by-step quickstart for the read-only Cisco ISE audit tool - install uv, clone the repo, fill the form, get a downloadable PDF report with findings and …
Subnetting Without a Calculator - The Magic-Number Method
No, you can't use a calculator on the CompTIA Network+ N10-009 exam - you subnet by hand. Here's the magic-number method to subnet any IPv4 mask in under 30 …
Post-Incident Forensics vs Live Response - When to Use Which
Live response captures volatile evidence from a running system. Post-incident forensics captures the disk after the fact. They answer different questions and …
SolarWinds Serv-U Zero-Day Exploited - Patch Now
SolarWinds Serv-U zero-day exploited via unauthenticated POST. C0XMO botnet targets DD-WRT routers. Meta AI tool hijacks 20K Instagram accounts.
Containment Decisions Under Pressure - Why Network Isolation Isn't Always Right
Containment is a trade-off, not a reflex. When network isolation is wrong, when pulling the plug destroys your case, and the decision matrix for choosing the …
Building an Incident Response Playbook from Zero
A practical template for writing an incident response playbook from scratch - what to include, how to map it to NIST 800-61, roles and RACI, comms templates, …
Cisco SD-WAN Zero-Day CVE-2026-20245 - Exploited, No Patch
CVE-2026-20245 gives root on Cisco SD-WAN with no patch available. Plus IronWorm hits 36 npm packages and Five Eyes warns on Chinese recruiter ops.
Malware Triage in 5 Minutes - A First-Responder Checklist
A first-responder malware triage checklist - what to do in the first 5 minutes of finding a suspicious binary. Static-vs-dynamic decision tree, hashing, …