DNS and DHCP Infrastructure Flashcards

Which DHCP failover mode designates one server as active and one as standby, with the standby taking over automatically if the active server fails?

Answer: Hot Standby mode

Hot Standby mode keeps one DHCP server active while the other remains ready to take over immediately upon detecting a failure of the active server.

Which DNS zone type contains only SOA, NS, and glue A records sufficient to locate the authoritative name servers for a zone?

Answer: Stub Zone

A stub zone contains the minimal records needed (SOA, NS, and associated A records) to find the authoritative servers for a zone without hosting all records.

What Windows Server DNS feature enables administrators to control DNS responses based on client subnet, allowing traffic management by network location?

Answer: DNS Policies

DNS Policies allow administrators to define rules that return different DNS responses based on client subnet, time of day, or query type.

Which DHCP option provides clients with the DNS domain name suffix to append during unqualified DNS name resolution?

Answer: Option 015

DHCP Option 015 (DNS Domain Name) provides the domain suffix that clients use when resolving unqualified hostnames via DNS suffix search.

What Windows Server DNS process automatically removes resource records that have not been refreshed within the configured no-refresh and refresh intervals?

Answer: DNS Scavenging

DNS Scavenging deletes stale resource records whose timestamps exceed the sum of the no-refresh and refresh intervals, keeping zones clean.

Which type of DNS query requires the DNS server to provide a complete final answer and not merely refer the client to another server?

Answer: Recursive query

In a recursive query, the DNS server takes full responsibility for resolving the name and must return either the answer or an error — not a referral.