Will this configuration achieve fault tolerance for managers in a swarm?
Solution: only two managers, one active and one passive.

Seven managers are in a swarm cluster.
Is this how should they be distributed across three datacenters or availability zones?
Solution: 3-3-1

Which of the following modes can be used for service discovery of a Docker swarm service (Pick 2 correct answers)

Will a DTR security scan detect this?
Solution: licenses for known third party binary components

In Docker Trusted Registry, is this how a user can prevent an image, such as 'nginx:latest', from being overwritten by another user with push access to the repository?
Solution: Use the DTR web Ul to make all tags in the repository immutable.