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 Guides and Tutorials
Practical FOO.XYZ guides in the Networking category, with commands and troubleshooting examples.
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.
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.