All peoples on this Worlds know That Joomla have Default administrator links as www.domain.com/folder or without folder/administrator and can easily navigate the admin folder so must of joomla site has been hacked through this reason also.Now How To protect The admin directory,Very simple process Just download and install Admin Tools from https://www.akeebabackup.com/software/admin-tools.html and,go to Component-admin tools-on security section click on Password protect administrator type required user and password then on yours joomla admin folder there is an extra layer of security to access it. Note:Your server must support this type of password protection.
Well I've just tried accessing /administrator on your website ijoome and I have to agree that it's a good way of preventing people from reaching your administrator page. Doesn't this mean that you'd have to have 2 different usernames and passwords to access the back-end of the website though?
And You can also used Joomla Security module If some spammer accessing administrator directory then more then 3 miss user and pass Then Spammers Ip will Band Premantely this also Help from Hacking an Sites.