200-901 Application Deployment and Security Practice Question

A Docker container needs to be started in detached mode with port mapping from host port 8080 to container port 80. Which command accomplishes this?

Answer choices

Why each option matters

Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.

Correct answer & explanation

✓

docker run -d -p 8080:80 myapp

The -d flag runs container in detached mode, -p maps host port to container port.

Answer analysis

For each option: why learners choose it and why it is or isn't the right answer here.

✗
docker start -d -p 8080:80 myapp
Why it's wrong here
docker start does not accept -p; ports are set at run time.
✓
docker run -d -p 8080:80 myapp
Why this is correct
Correct detached mode and port mapping.
✗
docker run -it -p 8080:80 myapp
Why it's wrong here
-it runs interactively, not detached.
✗
docker run -d -p 80:8080 myapp
Why it's wrong here
Port mapping order is hostPort:containerPort. The mapping is reversed.

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