(Here I explain, why he can't post it anywhere)
Well, this is a hard thing. The main problem that SE sites tend to interpret their topicality as narrow as possible, and it tends to worsen with time. Although sometimes there are also possitive changes, I suspect mainly CM effect behind that and not the "natural" change of the community.
Your question seems to me a border case on many sites, which means it can be accepted manywhere, but nowhere has a big chance. The sites I would suggest:
- http://networkengineering.stackexchange.com . They have very strict and narrow topicality, despite their urge to grow. But maybe a little bit of previous consultation on their meta could help.
- http://programmers.stackexchange.com . Here the main problem is that it is not a programming question, maybe with programming-related certificates you would have more chance.
- http://serverfault.com . They also have a similarly strict policy as the networkengineering.
- http://academia.stackexchange.com . Here the main problem that they are focusing to post-grad matters and not to out-of-academia certifications as yours.
- http://workplace.stackexchange.com . Here you can find answer on workplace and jobsearch-related things, I suspect maybe at least some of your questions would fall in this category.
(From here I explain, what possible roundabouts and partial solutions I can see)
There is also the surprisingly unused chat, most of the sites have one. On the chatrooms, you can get answers to questions which are considered offtopic on the main site, but seem answerable by their power users. Most SE sites have a dedicated chat room for that.
Chat can be used also to consultation before or after the question, often it is possible that actually you can ask the question on a form, which passes the site review mechanism while you also get an answer to your question. For example, most sites actually allow asking your homework questions there, but the requirements in this matter are hard to pass. If the homework OPs would consult about this on the meta or in the chat, most of them could formulate their question to an acceptable form (or even get an answer there). Most of them simply won't do this. Maybe you can find a similar way also in your case.
It would be also possible to initiate a new site in the Area51, but it will be slow and it hasn't a quite high chance. From the other side, it would make possible for many people with similar problems as you to get their answers to their questions similar to yours.
It is also very important: the topic of the sites results, that you will get your answers in their viewpoint. Thus, for example, "What can I learn on a course of an XXX Cisco cert" can be more near to the topic of the networkengineering, while a question like "How the HR estimate the worth of an XXX Cisco cert in the selection process" may match much better the workplace SE. Thus, fragmenting your question and ask them differently on different sites is an useful strategy. You can also link your related questions on other sites in comments.
Most of the meta sites tend to behave like a fight club between the question closer community and the asker/defender community, thus initiating something on the meta will most likely result a long thread in negative tone. Remain always polite, and don't forget: your goal is to know, how can you ask your question in an acceptable form. Don't react to the attacks, it is much better if you try to move the discussion into a consultant line: how could it be asked on a conform way, what is the part of your question which is acceptable, etc.