The cert is done — and the site got its biggest two weeks ever.
Two months of home-lab nights and daily streaks came down to one word on the screen: PASS.
So this issue is part celebration, part changelog — because the last two weeks were the busiest this site has ever had.
THE LEAD: THE TRANSPORT LAYER, MADE OBVIOUS
TCP vs UDP is one of those topics the textbook makes harder than it needs to be. So I wrote the explainer I wish I'd had: TCP vs UDP — The Transport Layer for the CCNA.
The 3-Way Handshake: Why SYN / SYN-ACK / ACK exists, in plain English.
Ports & Sockets: How one IP address juggles a hundred conversations at once.
When UDP Wins: Voice, video, DNS, and why "unreliable" is sometimes the right call.
And because reading about a packet isn't the same as watching one move, there's a companion lab — the Packet Flow & Encapsulation Lab — where you trace a single packet down the stack, across the wire, and back up the other side.
THE ARCADE: STUDYING THAT DOESN'T FEEL LIKE STUDYING
The biggest build of the last two weeks. The site now has a full retro arcade of CCNA games — and yes, they keep score.
Port Guesser: Name the service behind the port before the clock runs out.
Subnet Survivor: Back-to-back subnetting under pressure.
Three More Drills: Command Guesser, Route Guesser, and STP Root Battle cover IOS commands, routing decisions, and spanning-tree elections.
Badges & Sound: Every game has a badge ladder (50 / 75 / 100 and a 12-streak shield), combo counters, and proper retro sound effects.
There's also a new site-wide XP layer — ranks, streak shields, and a weekly challenge — so the drills, games, and daily questions all feed one progress bar.
THE TECH DESK: TWO NEW VISUALIZERS
If you learn by seeing, these two are for you.
Packet Flow Visualizer: Watch a packet glide hop-by-hop through a topology, with attack and diagnostic tracks for when things go wrong.
Subnetting Visualizer: See the host/network split happen bit by bit instead of doing it on faith.
SYSTEM MAINTENANCE: TRACK YOUR OWN PROGRESS
All of it — drills, games, XP, and streaks — now rolls up into one place. My Progress is now in the top nav on every page: one dashboard for your streak, your rank, and your badges.
Pro Tip: Your progress saves in your browser, so do your drilling on the same device you'll keep coming back to.
FROM MY DESK (The Personal Bit)
Last issue I told you I was writing the exam that Sunday. Here's how it went: I passed. The CCNA 200-301 is officially done.
I'm not going to pretend it was easy or that I'm a natural. The hardest part was never the material — it was showing up on the nights I didn't feel like it. The daily streaks I kept nagging you about? I was keeping them too. The same discipline that gets me out the door for a long run is the one that carried me to exam day: show up, do the reps, don't negotiate with yourself. The habit beat the cram.
And remember that tech startup I teased last time? It's switchlab.dev. I've been pulled deep into the project, and the team has already done a fair amount of heavy lifting behind the scenes.
I'm not stopping here, either. I've already started down the CCNP Enterprise road, and a lot of what I learn both at SwitchLab and on the wire is going to land on this site as I go. The textbook-to-real-world gap doesn't close at the CCNA — it just gets more interesting.
IF YOU ONLY HAVE 5 MINUTES THIS WEEK: Read the TCP vs UDP article, then go lose three rounds of Port Guesser. You'll remember the ports forever.
WHAT'S NEXT More transport-layer and CCNA & CCNP-flavored material, and answer keys for the labs. Hit reply and tell me the exact networking concept messing with your head right now — I read every single response, and it tells me what to build and write next.
— Dylan Burlington, ON
P.S. — Know someone else grinding through their Cisco studies? Forward this their way. The streak's a lot more fun when you have a buddy's to defend.