Unable to connect to SQL Server instance by providing FQDN name

Today i got one of the errors in my environment, i am trying to access one of the sql server instances from another server.
For example  i have two servers one is NODE1 and another is NODE2. I am  trying connecting to NODE2 from NODE1. If i give a server name as NODE2 it is not working but if i give ip address of the respective instance it is working. My challenge here is how to connect to SQL Server instance by providing the name.  I am getting error as name is not available, but if we see the server name  is existing. At this stage i follwed below process.
I wen to below path in NODE1  the path is

C:\Windows\System32\drivers\etc 

and in etc folder i found "hosts" file. Right click on this file open with note pad. And add NODE2 ip along with FQDN name and save it. And then check now it will take server name, you can access SQL Server instance after you are adding the ip and FQDN name of that particular server.

192.168.10.11  NODE2.RAPS.COM




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