Comments by kulbhushan18 (Top 6 by date)

Example: user A has been recently assigned full permission for siteCollection S1, so a search for him would fetch results from S1. To take this change effect, what Crawl is required. Is incremental crawl sufficient or Full Crawl is mandatory.

and ofcourse user A, before being granted the permission, won't get result for search from S1.

I am sorry if my question was not elaborated, hope above example explains my query.

thanks for your answer Ryan, me too stumbled upon this article, my concern is:
If a new user/group is given permission to a web/siteCollection; Does it shown up using Incremental Crawl? (in SP2010)

It is known that item level permissions are reflected in incremental crawl, but what about site collection level permission.

I would not suggest to invest so much right now for the training(not sure how much that would do good for you). But you should start hands on (there are several virtual labs from Microsoft, even installing SharePoint in VM would help). And once you are little bit comfortable with the environment YOU SHOULD GO FOR MCTS CERTIFICATION 70-573