Category Core IT

Network Troubleshooting: A Structured Method to Find and Fix Connectivity Issues Network troubleshooting can look a bit intimidating at first, because problems rarely come with a clear error message. A user says “the internet is down,” but the internet is…

Network Planning and Infrastructure: How to Design, Cable and Document a Reliable Network From the outside, network planning can look like “run cables, place a switch, get the internet working.” But once you look a bit deeper, you realize this:…

WLAN Explained: How Wi-Fi Works, Which Band to Use, and How to Secure It Wi-Fi is often seen as “set up the modem, type the password, done.” At home, for most people, it really is like that. But once you…

Firewall, NAT and DMZ: How Network Security Really Works in Practical Setups When you’re just starting to build a network, the goal is usually simple: devices should get internet access, servers should run, and everyone should be able to do…

DHCP and DNS Basics: How Devices Get IP Addresses and Resolve Names in Real Networks When we first check whether a network is working, we usually measure it by the cable, Wi-Fi, and the question “Is it getting an IP?”…

Routing and WAN: How Routers Choose the Best Path Across Networks Once you’ve somewhat internalized IP and subnetting, the next question naturally appears: “Okay, devices in the same subnet can find each other. But how does traffic travel between different…

IP Addressing and Subnetting: How IPv4/IPv6 and CIDR Define Network Boundaries As someone new to networking, IP addresses can initially feel like something you just memorize: numbers starting with 192.168… and then expressions like /24, /26 on top of that.…

From Switching to VLANs: How Trunks, Tagging and STP Keep Networks Organized As someone new to switching, the confusion usually starts at this point: “I plugged in the cable, the devices can see each other… so is the job done?”…

How Data Really Moves in a Network: MAC Addresses, ARP, Broadcast Domains and the Logic Behind It When you start building or managing a network, everything looks simple at first: there is a cable, a switch, an IP address –…