I used to “know” DNS.

Meaning:

I could say “it translates domain names to IP addresses.”

But if you asked me what actually happens after typing google.com…

I had no idea.

No resolver. No root server. No TLD. Nothing.

Just a memorized sentence.

That’s how most people study cybersecurity.

Memorize → forget → panic in interviews.

Understanding starts when you admit:

“I don’t actually get this.”

Then fix it.

Start with DNS.