i want building a wifi network for 30 rooms holiday hotel in srilanka

[farsanadam]

• 
  internet must be accessible anywhere within the premises regardless the devices.
  • everyone gets a fair amount of access
  • unauthorized access are not allowed
  • user privacy should be protected
  

 

[kanewolf]

Hire a consultant to design it. Hire someone that can do a physical survey. You will end up with several WIFI access points going back to a POE switch which will then go to a router and the internet.

Since you are in SriLanka, the availability of any specific brand of small business hardware is hard to recommend.