A company's end users are reporting that they are unable to reach external websites. After reviewing the
performance data for the DNS severs, the analyst discovers that the CPU, disk, and memory usage are
minimal, but the network interface is flooded with inbound traffic. Network logs show only a small number of
DNS queries sent to this server. Which of the following best describes what the security analyst is seeing?


A. Concurrent session usage
B. Secure DNS cryptographic downgrade
C. On-path resource consumption
D. Reflected denial of service