DNS aging and scavenging serve what purpose in DNS management?

• A. They create new DNS zones automatically.
• B. They remove stale DNS records to keep the DNS zone accurate and reduce stale data.
• C. They enforce dynamic updates only.
• D. They accelerate DNS query times.

Answer: (C)

Aging and scavenging manage the lifecycle of dynamically updated DNS records. They ensure that records which haven’t been refreshed in a defined period are considered stale and then removed by the scavenger. This automatic cleanup keeps the DNS zone accurate by eliminating outdated mappings, such as A records for hosts that have left the network or changed addresses, and it helps prevent stale data from being returned in lookups. They don’t create zones, they don’t enforce updates, and they don’t directly affect query speed—their purpose is data correctness and cleanliness in dynamic environments, especially where DHCP or hosts frequently come and go.