Cisco
200-301 · Question #1676
How does a DNS server improve network efficiency when resolving domain names?
The correct answer is C. by caching DNS records to reduce the number of external queries. DNS servers cache previously looked-up records so that repeat requests can be answered locally without querying upstream servers, reducing external traffic and lookup latency.
Submitted by ricky.ec· Mar 5, 2026
Question
How does a DNS server improve network efficiency when resolving domain names?
Options
- Aby using round-robin scheduling to balance the load across multiple servers
- Bby permanently storing all DNS records for faster access
- Cby caching DNS records to reduce the number of external queries
- Dby compressing DNS records to decrease their size
How the community answered
(41 responses)- A2% (1)
- C95% (39)
- D2% (1)
Explanation
DNS servers cache previously looked-up records so that repeat requests can be answered locally without querying upstream servers, reducing external traffic and lookup latency.
Topics
#DNS#DNS caching#Network efficiency
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