Will this command ensure that overlay traffic between service tasks is encrypted? Solution: docker network create -d overlay --secure

The correct answer is B. No. The docker network create -d overlay --secure command does not encrypt overlay traffic; instead, the --opt encrypted flag must be used with overlay networks.

Submitted by klara.se· Apr 18, 2026Networking

Question

Options

AYes
BNo

How the community answered

(22 responses)

A
9% (2)
B
91% (20)

Why each option

The `docker network create -d overlay --secure` command does not encrypt overlay traffic; instead, the `--opt encrypted` flag must be used with overlay networks.

AYes

The `--secure` flag does not enable encryption for Docker overlay networks.

BNoCorrect

The `--secure` flag is not a valid option for `docker network create` to enable encryption. To encrypt overlay traffic in Docker Swarm, the `docker network create --opt encrypted` flag must be explicitly passed when creating the overlay network.

Concept tested: Docker Swarm overlay network encryption

Source: https://docs.docker.com/network/overlay/

Topics

#Docker Networking#Overlay Networks#Network Encryption#docker network create

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