N10-005 Question #806: Real Exam Question with Answer & Explanation

The correct answer is A: Automatic registration of host records. Dynamic DNS (DDNS) allows hosts with dynamically assigned IP addresses to automatically update their DNS records, effectively providing automatic registration of host records. This ensures the hostname always resolves to the current IP address.

Question

Dynamic DNS provides which of the following services?

Options

AAutomatic registration of host records
BTranslates public host names to private host names
CProvides round robin load balancing for web servers
DProvides aliases for additional search suffixes

Explanation

Dynamic DNS (DDNS) allows hosts with dynamically assigned IP addresses to automatically update their DNS records, effectively providing automatic registration of host records. This ensures the hostname always resolves to the current IP address.

Common mistakes.

B. DNS translates hostnames to IP addresses, but Dynamic DNS does not perform public-to-private hostname translation; that function is associated with split-horizon DNS or NAT-based solutions.
C. Round-robin load balancing distributes queries across multiple A records for the same hostname and is a standard DNS feature unrelated to Dynamic DNS updates.
D. DNS search suffixes are configured in the client resolver settings or via DHCP option 119 to append domain names to unqualified queries, which is not a function of Dynamic DNS.

Concept tested. Dynamic DNS automatic host record registration

Reference. https://learn.microsoft.com/en-us/windows-server/networking/dns/what-s-new-in-dns-server#dynamic-dns-updates

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