For a GSLB setup with two ADNS services, which DNS record must be added on the parent DNS server to delegate requests to Citrix ADC 1 and 2?

For a GSLB setup with two ADNS services, which DNS record must be added on the parent DNS server to delegate requests to Citrix ADC 1 and 2?

• A. Canonical Name (CNAME)
• B. Address (A) record
• C. Pointer Record (PTR)
• D. Name Server (NS) record

Answer: (D)

Delegating control of a subdomain to specific DNS servers is done with NS records on the parent zone. In a GSLB setup with two ADNS services, the parent DNS server must specify the two Citrix ADC devices as the authoritative name servers for the GSLB domain. The NS records tell resolvers which servers hold the official zone data for that subdomain, enabling requests to be directed to ADC1 and ADC2 and allowing proper load distribution and failover between them. Other record types don’t provide delegation: a CNAME creates an alias to another domain and can’t designate multiple authoritative servers; an A record maps a name to an IP but doesn’t indicate who is authoritative for the zone; a PTR is used for reverse DNS, not delegation.

Delegating control of a subdomain to specific DNS servers is done with NS records on the parent zone. In a GSLB setup with two ADNS services, the parent DNS server must specify the two Citrix ADC devices as the authoritative name servers for the GSLB domain. The NS records tell resolvers which servers hold the official zone data for that subdomain, enabling requests to be directed to ADC1 and ADC2 and allowing proper load distribution and failover between them. Other record types don’t provide delegation: a CNAME creates an alias to another domain and can’t designate multiple authoritative servers; an A record maps a name to an IP but doesn’t indicate who is authoritative for the zone; a PTR is used for reverse DNS, not delegation.