MCTS 70-640 DNS & Name Resolution for Active Directory 1 — Questions and Answers
Question 1: Which DNS record type is required for domain controllers to be located by clients in Active Directory?
- A record
- SRV record (Correct answer)
- MX record
- PTR record
Correct answer: SRV record
SRV (Service Locator) records are registered by domain controllers so clients can locate AD services like LDAP and Kerberos.
Question 2: Which tool is used to manually register DNS SRV records for a domain controller on Windows Server 2008?
- ipconfig /registerdns (Correct answer)
- nltest /dsregdns
- net logon restart
- dcdiag /fix
Correct answer: ipconfig /registerdns
Running 'ipconfig /registerdns' forces the DNS client and Netlogon service to re-register all DNS records for the domain controller.
Question 3: What is the purpose of a stub zone in DNS?
- To cache all records from a primary zone
- To contain only NS, SOA, and A records for a zone to resolve names in that zone (Correct answer)
- To block external DNS queries
- To replicate all DNS records to all domain controllers
Correct answer: To contain only NS, SOA, and A records for a zone to resolve names in that zone
A stub zone holds only NS, SOA, and glue A records so the DNS server knows the authoritative servers for that zone.
Question 4: Which DNS zone type automatically replicates zone data to all DNS servers running on domain controllers in the forest?
- Standard primary zone
- Standard secondary zone
- Active Directory-integrated zone with ForestDNSZones scope (Correct answer)
- Active Directory-integrated zone with DomainDNSZones scope
Correct answer: Active Directory-integrated zone with ForestDNSZones scope
Forest-wide AD-integrated zones replicate through the ForestDNSZones application partition to all DNS-enabled DCs across the entire forest.
Question 5: What command verifies that a domain controller has registered its DNS SRV records correctly?
- nslookup -type=SRV _ldap._tcp.<domain> (Correct answer)
- ping <domain>
- tracert <dc>
- netstat -an
Correct answer: nslookup -type=SRV _ldap._tcp.<domain>
Using nslookup with the SRV type query against _ldap._tcp.<domain> confirms that the DC's LDAP SRV records are present and resolving.
Question 6: Which DNS feature prevents clients from receiving stale cached records by enforcing a maximum record age?
- Dynamic updates
- Scavenging (Correct answer)
- Forwarders
- Conditional forwarding
Correct answer: Scavenging
DNS scavenging removes stale resource records based on configurable no-refresh and refresh intervals to keep the zone clean.
MCTS 70-640 DNS & Name Resolution for Active Directory 1
Which DNS record type is required for domain controllers to be located by clients in Active Directory?