Copilotfree, in-browser
Ask me anything about your lessons or your code.
“What is a port?” · “Why is my code erroring?”
Ask me anything about your lessons or your code.
“What is a port?” · “Why is my code erroring?”
Every connection starts with a name lookup you never see and rarely question.
How DNS Really Works
Every connection starts with a name lookup you never see and rarely question.
DNS Attacks
A protocol built on trust, running over UDP, caching everything. Attackers noticed.
Securing DNS
Sign the answers, encrypt the queries, and watch the traffic you cannot stop.
DHCP and NTP Risks
The services that hand out addresses and set the clock decide who you trust.
Monitoring Network Services
You cannot flag abnormal until you have written down what normal looks like.