Challenging troubles in Smart Crawler

As wide net structure grows at a very greatly pace, in this techniques interest has been increased potential to detect wide net structure connections. However, due to the large amount of net structure resources and the moveable nature of wide net structure to get wide coverage and high efficiency is a hard question under discussion. Rigorous research has been done on crawler and a large number of articles have been published on this topic during the last few decades. But lots of troubles are remaining, which are not worked on previously developed technique. In this paper we are surveying the ready techniques used for deep net structure crawling and also troubles which occurred in deep net structure crawling. There is one important trouble that crawler only support for single word i.e keyword, not for more than two keywords. Single word having multiple meaning that is big problem, at that time of searching. Second is Ranking process will take more time. In this paper, we discuss some challenging troubles which are faced by user.