Which of the following descriptions of smart DNS is incorrect?

Question

Options

• ABy configuring the smart DNS function, the firewall can intelligently modify the resolution address
• BIntelligent DNS supports weighted polling to achieve link load balancing
• CSmart DNS does not need to be combined with other technologies and can be used alone
• DSmart DNS is divided into two scenarios: single-server smart DNS and multi-server smart DNS.

• A
  10% (5)
• B
  4% (2)
• C
  71% (34)
• D
  15% (7)

Explanation

Option C is incorrect because Smart DNS is specifically designed to work in conjunction with other technologies - such as NAT, routing policies, or link load balancing - to function effectively; it cannot operate as a standalone solution. Option A is a true statement: Smart DNS allows a firewall to intelligently modify DNS resolution responses based on configured rules, directing traffic to different servers or links. Option B is also accurate: Smart DNS supports weighted round-robin polling, distributing DNS resolution across multiple links proportionally to achieve load balancing. Option D is equally correct: Smart DNS does have two deployment scenarios - single-server (one server handles all resolution) and multi-server (multiple servers, often across different ISPs or regions).

Memory tip: Think of Smart DNS as a "traffic director" - it can't stand alone at the intersection directing cars without roads (other technologies) already being in place. The word "alone" in option C is your red flag.

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