What Is a VLAN? A Beginner's Guide to Network Segmentation
Learn how VLANs separate devices on one network, how access and trunk ports work, and what to check before deploying VLANs in a small business.
Networking, Linux and Infrastructure Guides
Practical guides to networking, Linux, FreeBSD, DNS, security, and infrastructure from FOO.XYZ, with commands and troubleshooting examples.
The Data Center Fight Is Mostly About AI Scale
The data center fight is growing as communities challenge AI projects. See why essential internet infrastructure deserves a separate debate.
Ransomware Costs in 2025: Corporate and SMB Impact
Compare reported ransomware losses in 2025, learn how double extortion and leak sites increase costs, and see the impact on corporations and SMBs.
What Is DNS and How Does It Work?
Learn how DNS turns domain names into IP addresses, how servers and caches handle a lookup, and why finding an address differs from loading a page.
The 3-2-1 Backup Rule for Small Businesses
Build a practical 3-2-1 backup plan for your small business. Learn what RAID and cloud sync miss, protect an off-site copy, and test a restore.
Dangling DNS Records, Placeholder Domains, and the Cost of Lazy IT
Forgotten DNS records and placeholder domains can expose sensitive information. Learn how misconfigurations lead to unexpected DNS traffic and email leaks.
What Is DNSSEC? A Simple Guide to Secure DNS
Learn what DNSSEC is, how it protects DNS records, and how to check signatures, public keys, and resolver validation with simple dig commands.
DNS Troubleshooting with Dig and Drill
Learn to use dig and drill on Linux and FreeBSD to inspect DNS records, compare resolvers, trace delegation, and troubleshoot DNSSEC failures.