Carving a network into equal-size subnets wastes addresses. A point-to-point link with two routers does not need the…
Most people who struggle with the CCNA do not freeze on OSPF or VLANs. They freeze on a…
DNS turns names into addresses, so you can reach server1.lab.example.com without memorizing 10.0.0.1. A Cisco router handles names…
When the default gateway on a subnet dies, every host on it loses the path off the LAN…
Most of the time you spend on a Cisco router or switch is spent typing in the IOS…
Telnet sends your username and enable password across the wire in cleartext. SSH does not, and on a…
A factory-fresh Cisco router or switch trusts whoever reaches the console, answers to the generic name Router or…
The CCNA 200-301 is a single exam that certifies you can install, configure, and troubleshoot a small enterprise…
The FreeRADIUS package in your distribution repository is almost always behind upstream. Ubuntu ships a 3.0.x or 3.2.x…
GNS3 is an open source network emulator used by hundreds of thousands of network engineers to design, configure,…
Ubiquiti shipped UniFi OS Server in 2024 as a way to self-host the UniFi stack on your own…
A single HAProxy box in front of your web servers solves load balancing, but the box itself is…
