two ADNS services named Citrix ADC 1 and Citrix ADC 2 in the setup. Which record does the administrator need to add on the parent DNS server to delegate requests

Question

Options

• ACanonical Name (CNAME)
• BPointer Record (PTR)
• CName Server (NS) record
• DAddress (A) record

• A
  3% (1)
• C
  3% (1)
• D
  95% (35)

Explanation

When delegating DNS queries to Citrix ADC ADNS services, the parent DNS server must have Address (A) records - also called glue records - that map each ADNS service's hostname to its IP address. Without these A records, the parent server has no way to resolve where to physically send the delegated requests, since the ADNS server names themselves fall within the zone being delegated.

Why the distractors are wrong:

• (C) NS record - NS records declare which servers are authoritative for a zone, but an NS record alone is unresolvable if the name server lives within the delegated zone; the A glue record is what makes the delegation functional.
• (A) CNAME - CNAMEs are aliases for existing hostnames and are explicitly prohibited on name server entries per DNS standards; they cannot be used for delegation.
• (B) PTR - PTR records are for reverse DNS lookups (IP → hostname) and play no role in forward delegation.

Memory tip: Think "A is for Address, and you need an Address to actually reach the ADNS server." The NS record names the authority, but the A record is the phone number that gets you there - without it, delegation is a dead end.

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