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DCA · Question #162
DCA Question #162: Real Exam Question with Answer & Explanation
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Submitted by klara.se· Apr 18, 2026Image Creation, Management, and Registry
Question
You are pulling images from a Docker Trusted Registry installation configured to use self-signed certificates, and this error appears: 'x509: certificate signed by unknown authority'. You already downloaded the Docker Trusted Registry certificate authority certificate from https://dtr.example.com/ca. How do you trust it? (Select two.)
Options
- APlace the certificate in '/etc/docker/dtr/dtr.example.com.crt' and restart the Docker daemon on all
- BPlace the certificate in your OS certificate path, trust the certificate system-wide, and restart the
- CPass '-trust-certificate ca.crt' to the Docker client.
- DPass --insecure-registry to the Docker client.
- EPlace the certificate in '/etc/docker/certs.d/dtr.example com/ca.crt' on all cluster nodes.
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Topics
#Docker Registry#Certificates#Daemon Configuration#Troubleshooting