CCIE lab exam - failed twice before figuring out what the scoring actually tests
Took two CCIE lab attempts before passing on my third. Not writing this to brag - I want to save someone the specific mistake that cost me the first two attempts. The CCIE lab isn't testing whether your configurations work in isolation. It's testing whether your configurations work while coexisting with everything else in the topology. That sounds obvious but it took failing twice for it to actually change how I studied.
First attempt: scored 62% (pass is 80%). I had solid individual technology knowledge but couldn't troubleshoot fast enough when my BGP route filtering was breaking OSPF redistribution in a scenario I hadn't specifically practiced. Second attempt: scored 74%. Got the topology integration concept but time management was wrong - I spent 40% of my time on 25% of the marks. Third attempt: 83%.
What changed for the third attempt was lab simulation strategy. I started practicing full 8-hour simulations at least twice a week for the final 3 months. Not individual technology labs - complete topologies from scratch with time pressure. The mental endurance factor in an 8-hour lab exam is real and you can't fake your way through it.
Study timeline total: about 18 months from decision to pass, working full time as a senior network engineer. 2-3 hours daily on weekdays, 6-8 hours on Saturdays. Total investment is roughly 1,800-2,000 hours for someone already at CCNP level. Don't let anyone tell you this is a 6-month exam if you have a day job.
What track did you pursue? The topology complexity is different between Routing/Switching, Data Center, and Security tracks. Just want to calibrate whether the 18-month estimate applies to my situation too.
8-hour simulation labs twice a week for 3 months is a serious commitment. That's 48+ hours of full simulation runs. But the mental endurance point is real - I've seen people with strong technical knowledge fall apart in hour 6 just from fatigue.
The coexistence point is the most important thing you've said. Every CCIE I've talked to describes the same thing - passing configurations breaking each other under full topology conditions.
18 months working full time is about right. I'm 14 months in and not close to ready yet.
The time management issue on the second attempt is something I'm actively working on. I have a tendency to over-perfect early tasks and run out of time on later sections. Practicing with hard time boxes per section has helped a lot.
Quick update from my end -- I've been grinding through rack rentals for the past three weeks and just hit an 82% on my last full practice run, which honestly surprised me given how much I was struggling with the TS section two months ago. Still not where I want to be but it finally feels like the topology is clicking.
Planning to sit the real thing in mid-August, which gives me about eight more weeks to tighten up my BGP policy configs and stop second-guessing myself on the verification side. If you're at that stage where your configs work but you keep failing, seriously take what OP said to heart -- I wasted so much time troubleshooting in isolation before I started testing everything together as a single running network.