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DCA New Real Exam - New DCA Exam Sample

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Docker Certified Associate (DCA) Exam Sample Questions (Q170-Q175):

NEW QUESTION # 170
The Kubernetes yaml shown below describes a networkPolicy.

Will the networkPolicy BLOCK this traffic?
Solution: a request issued from a pod bearing the tier: backend label, to a pod bearing the tier: frontend label

A. No
B. Yes

Answer: A

Explanation:
The networkPolicy shown in the image is a Kubernetes yaml file that describes a networkPolicy. This networkPolicy will not block traffic from a pod bearing the tier: backend label, to a pod bearing the tier:
frontend label. This is because the networkPolicy is configured to allow ingress traffic from pods with the tier:
backend label to pods with the tier: frontend label. References:
* Content trust in Docker | Docker Docs
* Docker Content Trust: What It Is and How It Secures Container Images
* Automation with content trust | Docker Docs

NEW QUESTION # 171
Which networking drivers allow you to enable multi-host network connectivity between containers?

A. bridge, macvlan, ipvlan, overlay
B. macvlan, ipvlan, and overlay
C. bridge, user-defined, host
D. host, macvlan, overlay, user-defined

Answer: B

NEW QUESTION # 172
You want to provide a configuration file to a container at runtime. Does this set of Kubernetes tools and steps accomplish this?
Solution: Turn the configuration file into a configMap object and mount it directly into the appropriate pod and container using the .spec.containers.configMounts key.

A. No
B. Yes

Answer: A

NEW QUESTION # 173
Is this a type of Linux kernel namespace that provides container isolation?
Solution.Host

A. No
B. Yes

Answer: A

Explanation:
= Host is not a type of Linux kernel namespace that provides container isolation. Linux namespaces are a feature of the Linux kernel that partitions kernel resources such thatone set of processes sees one set of resources while another set of processes sees a different set of resources1. There are eight kinds of namespaces available: Mount, Process, User, Network, UTS, IPC, Cgroup, and Time1. Host is a parameter that can be used to run a container in the host's network namespace, which means the container shares the same network interfaces and configuration as the host2. Reference:
Linux namespaces - Wikipedia
Network settings | Docker Documentation

NEW QUESTION # 174
Will this Linux kernel facility limit a Docker container's access to host resources, such as CPU or memory?
Solution: seccomp

A. Yes
B. No

Answer: A

Explanation:
= Seccomp is a Linux kernel feature that allows you to restrict the actions available within the container. By using a seccomp profile, you can limit the system calls that a container can make, thus enhancing its security and isolation. Docker has a default seccomp profile that blocks some potentially dangerous system calls, such as mount, reboot, or ptrace. You can also pass a custom seccomp profile for a container using the --security-opt option. Seccomp can limit a container's access to host resources, such as CPU or memory, by blocking or filtering system calls that affect those resources, such as setpriority, sched_setaffinity, or mlock. Reference:
Seccomp security profiles for Docker
Hardening Docker Container Using Seccomp Security Profile

NEW QUESTION # 175
......

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