Nicole, a systems administrator, is seeking methods to defend her public DNS server from hackers. Which of these is her BEST solution?

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Domain 4: Communication and Network Security Practice Questions
Questions from the following topics are included in this domain:   
Assess secure network design principles.   
Implement secure network design principles.  
Secure network components using network access control devices.   
Implement secure design communication channels.  
Understand data communications and virtualized networks.    


Nicole, a systems administrator, is seeking methods to defend her public DNS server from hackers. Which of these is her BEST solution?