Cisco certification practice, one question at a time
Short daily practice questions for the CCNA and CCNP — each one written up here in full, so you can read the reasoning instead of rewatching a video to find it.
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UDP drops the safety net on purpose. Here's the one thing it buys you that TCP never can.
CCNAWhat actually happens to a frame crossing a trunk?802.1Q inserts a tag into the frame itself. Here's exactly where it goes.
CCNATwo routes to the same network. Which one wins?Administrative distance is the tiebreaker before metric ever gets a look in.
Recently published
| 2026-08-27 | Why would anyone choose the unreliable protocol? | Fundamentals & media |
| 2026-08-27 | What actually happens to a frame crossing a trunk? | Switching & VLANs |
| 2026-08-27 | Two routes to the same network. Which one wins? | Routing |
| 2026-08-24 | Why do packets secretly vanish over VPN tunnels? | Fundamentals & media |
| 2026-08-24 | Which OSPF area blocks both Type 3 and 5 LSAs? | Routing |
| 2026-08-24 | Do you actually know your DMVPN phases? | Routing |
| 2026-08-17 | Why your OSPF neighbor relationship is failing (CCNA drill) | Routing |
| 2026-08-17 | Why standard CBWFQ completely ruins voice calls | IP services & management |
| 2026-08-17 | Why do network engineers obsess over Wi-Fi channels 1, 6, and 11? | Wireless |
| 2026-08-17 | HSRP quick check: Do you actually know how failover works? | Routing |
About the content
Narration and visuals are AI-generated, and this is disclosed on every video. The material is checked against the published exam blueprints, but it is study support — not official Cisco training. Always verify configuration against Cisco's documentation and test in a lab before touching production.
Spotted an error? theragingnerd192@gmail.com — corrections are made and materially wrong videos removed.