In my last post I wrote that gitleaks reported no leaks in my portfolio repository, while a manual review found a Gmail app password in the git history. A missed detection is a problem to fix, not...
My mentor will review my portfolio, so before sending it I ran a full audit on it. The goal was simple: a security person should not find easy problems on the site of someone who wants to work in s...
Today I moved from theory to the command line. I learned how Cisco switches and routers are configured, how to secure them, and how to test a network with ping and traceroute. Cisco IOS modes Cis...
Today was about the services that work quietly in the background every time a device joins a network or opens a website. ARP: from IP address to MAC address Inside a local network, devices actual...
Today I studied networking fundamentals: how networks are designed, how switches and routers move data, and how IP addresses work. The topic that stayed with me most was IP addressing, so this post...
Today’s topic brought a lot of this week together with something most of us use every day: a home or small office wireless network, and how to secure it. One box, many jobs The “Wi-Fi router” at ...
A switch moves data inside one network. A router moves data between networks. This post is about how that decision is made, first on my own laptop and then on the router. Step 1: my laptop’s decis...
Subnetting was the topic that took me the longest to feel comfortable with. This post is my attempt to explain it simply, the way I wish someone had explained it to me. What a subnet mask does An...
This post covers the bottom two layers: the physical layer (cables and signals) and the data link layer (Ethernet, MAC addresses and switches). This is where data actually moves inside a local netw...
Networking has a lot of moving parts. To make sense of them, people split the work into layers. Each layer has one job and only talks to the layer above and below it. There are two models everyone ...