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CV0-004
Troubleshooting
hard
Question 2 of 15

A cloud engineer is troubleshooting an application that suddenly stopped resolving external domain names, but internal VPC DNS resolution still works. Instance internet connectivity through a NAT gateway is also functioning correctly for IP-based traffic. What is the most likely cause?

AThe VPC's DNS resolver is configured to forward external DNS queries but the external DNS forwarder is unavailable or misconfigured
BThe NAT gateway has failed
CThe instances' security groups are blocking all outbound traffic
DThe TLS certificates on the application have expired

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