Re: Way too simple.
honestly I probably couldn't (quickly) do multiple of those things without referring to previous examples I have used in the past. I feel I am adept at Linux having used it for almost 18 years now and well I just know I'm very good. I also know where to draw the line, I'm not going to go out on a half baked expedition to try to get some obscure open source project to work when I can get a commercial solution that does the job just fine (I used to do this back in the 90s, then I learned that was a bad approach oh how I remember the struggles of configuring linux to be a PPP dialup server what a pain that was).
But (like many I suppose) I don't have every little bit memorized (esp detailed configurations) if I'm not doing that every day (last time I really configured postfix was probably 3 years ago, it's just run since then). But I have all my docs, all my config examples. I also actively avoid doing things like rewrite rules in apache as well because they are PITA (prefer to do it at my real load balancers it's far easier).
And don't get me started on squid, that thing is a PITA. Always has been, I've set it up maybe 3 times in the past 14 years. Even with docs and examples it's a major PITA.
So I honestly, very honestly would probably not do so hot on this test, but I absolutely know that I am very good with Linux (having been tech lead on every project I've been involved with more or less since 2003) and have employers falling head over heels constantly trying to hire me (sorry, not interested I am happy where I am at now).
I've never put any faith in certs, generally they are not worth a whole lot. When I look at candidates I generally rank them lower the more certs they have, especially if they have really stupid ones like A+ type stuff. To-date my intuition on that has been accurate, generally candidates that have a lot of certs don't tend to know a whole lot. Same goes for candidates that have long resumes, the longer the resume the less they seem to know.
I never recall anyone ever asking me for a cert. I think it is more common if I was a dedicated network engineer. I do networking whether it's L2-L3 switching, or L4-L7 load balancing, (no dynamic routing), no certs though.
I suppose the biggest reason I don't recall every nitty bitty configuration detail, is really I have more valuable things to store in my brain.