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Docker DCA (Docker Certified Associate) is a certification exam that validates a candidate's skills and knowledge in managing and deploying Docker containers. The DCA certification is an industry-recognized credential that demonstrates a professional's ability to work with Docker technologies and tools. It is designed for IT professionals, developers, and DevOps engineers who want to demonstrate their proficiency in Docker and containerization.

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Docker Certified Associate (DCA) Exam Sample Questions (Q34-Q39):

NEW QUESTION # 34
A users attempts to set the system time from inside a Docker container are unsuccessful. Could this be blocking this operation?
Solution: Linux capabilities

A. Yes
B. No

Answer: A

Explanation:
Explanation
Linux capabilities are blocking this operation. Linux capabilities are a partitioning of the privileges traditionally associated with superuser into distinct units, known as capabilities, which can be independently enabled and disabled. Capabilities are used by Docker to restrict the operations that a container can perform on the host system. By default, Docker drops all capabilities except those needed for common operations, such as binding to ports below 1024 or mounting filesystems. One of the capabilities that is dropped by default is CAP_SYS_TIME, which allows setting the system clock. Therefore, a user cannot set the system time from inside a Docker container unless this capability is explicitly added. References:
https://docs.docker.com/engine/security/security/#linux-kernel-capabilities,
https://man7.org/linux/man-pages/man7/capabilities.7.html

NEW QUESTION # 35
Which networking drivers allow you to enable multi-host network connectivity between containers?

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

Answer: D

Explanation:
The networking drivers that allow you to enable multi-host network connectivity between containers are bridge, macvlan, ipvlan, and overlay. These drivers create networks that can span multiple Docker hosts, and therefore enable containers on different hosts to communicate with each other. The other drivers, such as host, user-defined, and none, create networks that are either isolated or limited to a single host. Here is a brief overview of each driver and how it supports multi-host networking:
*bridge: The bridge driver creates a network that connects containers on the same host using a Linux bridge.
However, it can also be used to create a network that connects containers across multiple hosts using an external key-value store, such as Consul, Etcd, or ZooKeeper. This feature is deprecated and not recommended, as it requires manual configuration and has some limitations. The preferred driver for multi-host networking is overlay1.
*macvlan: The macvlan driver creates a network that assigns a MAC address to each container, making it appear as a physical device on the network. This allows the containers to communicate with other devices on the same network, regardless of the host they are running on. The macvlan driver can also use 802.1q trunking to create sub-interfaces and isolate traffic between different networks2.
*ipvlan: The ipvlan driver creates a network that assigns an IP address to each container, making it appear as a logical device on the network. This allows the containers to communicate with other devices on the same network, regardless of the host they are running on. The ipvlan driver can also use different modes, such as l2, l3, or l3s, to control the routing and isolation of traffic between different networks3.
*overlay: The overlay driver creates a network that connects multiple Docker daemons together using VXLAN tunnels. This allows the containers to communicate across different hosts, even if they are on different networks. The overlay driver also supports encryption, load balancing, and service discovery. The overlay driver is the default and recommended driver for multi-host networking, especially for Swarm services4.
References:
*Use bridge networks
*Use macvlan networks
*Use ipvlan networks
*Use overlay networks

NEW QUESTION # 36
Will this action upgrade Docker Engine CE to Docker Engine EE?
Solution. Disable the Docker service via 'chkconfig' or 'systemctl'.

A. No
B. Yes

Answer: A

Explanation:
The action will not upgrade Docker Engine CE to Docker Engine EE. Disabling the Docker service via chkconfig or systemctl will only stop the Docker daemon from running, but it will not change the version or edition of the Docker engine1. To upgrade Docker Engine CE to Docker Engine EE, you need to follow these steps2:
* Download your Docker Enterprise license from the Docker Store).
* Install the docker-ee package from the Docker repository.
* Restart the Docker service and verify the version and edition. References: Start or stop the Docker daemon), How to upgrade Docker 18.09 Community Edition to Docker Enterprise 18.09)

NEW QUESTION # 37
Is this a Linux kernel namespace that is disabled by default and must be enabled at Docker engine runtime to be used?
Solution: user

A. Yes
B. No

Answer: A

Explanation:
The user namespace is a Linux kernel namespace that is disabled by default and must be enabled at Docker engine runtime to be used. The user namespace allows the host system to map its own uid and gid to some different uid and gid for containers' processes. This improves the security of Docker by isolating the user and group ID number spaces, so that a process's user and group ID can be different inside and outside of a user namespace1. To enable the user namespace, the daemon must start with --userns-remap flag with a parameter that specifies base uid/gid2. All containers are run with the same mapping range according to /etc/subuid and /etc/subgid3. Reference:
Isolate containers with a user namespace
Using User Namespaces on Docker
Docker 1.10 Security Features, Part 3: User Namespace

NEW QUESTION # 38
Is this a type of Linux kernel namespace that provides container isolation?
Solution: Authentication

A. No
B. Yes

Answer: A

Explanation:
= Authentication is not a type of Linux kernel namespace that provides container isolation. Namespaces are a feature of the Linux kernel that partitions kernel resources such that one set of processes sees one set of resources and another set of processes sees a different set of resources. Docker uses six different namespaces to isolate containersfrom the host and from each other: PID, USER, UTS, IPC, MNT, and NET12. Authentication is not one of them. Authentication is a process of verifying the identity of a user or a system, which is usually done by using credentials such as passwords, tokens, or certificates. Authentication does not directly affect the isolation of containers, although it can be used to control access to them. Reference:
Docker security | Docker Docs
Securing Docker Containers with Linux Kernel Features | Infosec

NEW QUESTION # 39
......

Getting the Docker Certified Associate (DCA) Exam certification exam is necessary in order to get a job in your desired tech company. Success in the Docker Certified Associate (DCA) Exam (DCA) certification exam gives you an edge over the others because you will have certified skills. The Docker Certified Associate (DCA) Exam certification exam badge will make a good impression on the interviewer. Most of the people planning to attempt the DCA Exam are confused that how will they prepare and pass DCA exam with good grades.

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100% Pass Quiz Docker - DCA The Best Reliable Source

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Docker Certified Associate (DCA) Exam Sample Questions (Q34-Q39):

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