Blog
Technical notes and articles on networking, security, and web development.
What Is a Firewall, and Why Does Every Network Need One?
What exactly does a firewall do, and how does it decide between good and bad traffic? A complete introduction to the firewall concept and its types.
6 min readSwitch vs. Router: A Simple Guide for Beginners
One of the first questions anyone entering the world of networking asks: what's the difference between a switch and a router? This article answers it with simple, real-world examples.
6 min readStep-by-Step: Configuring NAT on a Cisco Router
How do multiple computers with private IP addresses share a single public IP to reach the internet? A complete guide to PAT (NAT Overload) with real Cisco IOS commands.
7 min readStep-by-Step: Installing and Configuring WSUS for Centralized Windows Updates
How do you manage Windows updates for hundreds of organizational computers from one place, without hammering internet bandwidth? A complete guide to WSUS on Windows Server.
7 min readStep-by-Step: Configuring Access Control Lists (ACL) on a Cisco Router/Switch
How do you specify that only one particular subnet is allowed to access a server? A complete guide to Standard ACL with real Cisco IOS commands.
7 min readStep-by-Step: Configuring EtherChannel (Link Aggregation) on a Cisco Switch
How do you combine multiple physical cables between two switches into one faster logical link? A complete guide to EtherChannel with real Cisco IOS commands.
6 min readStep-by-Step: Understanding and Verifying Spanning Tree Protocol (STP) on a Cisco Switch
Why does a loop between switches paralyze an entire network, and how does STP prevent it? A complete guide to the STP concept and checking its status on Cisco.
6 min readStep-by-Step: Inter-VLAN Routing on Cisco (Router-on-a-Stick)
After creating VLANs, how do you let devices in two different VLANs talk to each other? A complete guide to Router-on-a-Stick with real Cisco IOS commands.
7 min readStep-by-Step: Configuring RAID and Storage Spaces on Windows Server
How do you protect server data from a single hard drive failure? A complete guide to RAID and Storage Spaces on Windows Server.
6 min read