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| Section | Weight | Objectives |
|---|---|---|
| Container Virtualization | 25% | - Docker - LXC - Container Virtualization Concepts - Container Orchestration Platforms |
| VM Deployment and Provisioning | 12% | - Cloud Management Tools - cloud-init - Packer - Vagrant |
| Full Virtualization | 25% | - QEMU - Virtualization Concepts and Theory - Libvirt Virtual Machine Management - Xen - Virtual Machine Disk Image Management |
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NEW QUESTION # 19
Which of the following values would be valid in the FROM statement in aDockerfile?
Answer: C
Explanation:
The FROM statement in a Dockerfile specifies the base image from which the subsequent instructions are executed1. The value of the FROM statement can be either an image name, an image name with a tag, or an image ID1. The image name can be either a repository name or a repository name with a registry prefix2. For example, ubuntu is a repository name, and docker.io/ubuntu is a repository name with a registry prefix2. The tag is an optional identifier that can be used to specify a particular version or variant of an image1. For example, ubuntu:focal refers to the image with the focal tag in the ubuntu repository2. The image ID is a unique identifier that is automatically generated when an image is built or pulled1. For example, sha256:
9b0dafaadb1cd1d14e4db51bd0f4c0d56b6b551b2982b2b7c637ca143ad605d2 is an image ID3.
Therefore, the only valid value in the FROM statement among the given options is ubuntu:focal, which is an image name with a tag. The other options are invalid because:
* docker://ubuntu:focal is not a valid image name format. The docker:// prefix is used to specify a transport protocol, not a registry prefix4.
* registry:ubuntu:focal is not a valid image name format. The registry prefix should be a valid hostname or IP address, not a generic term2.
* file:/tmp/ubuntu/Dockerfile is not a valid image name format. The file: prefix is used to specify a local file path, not an image name5.
* http://docker.example.com/images/ubuntu-focal.iso
is not a valid image name format.
The
http:// prefix is used to specify a web URL, not an image name
5.
References:
1: Dockerfile reference | Docker Docs
2: docker - Using FROM statement in dockerfile - Stack Overflow
3: How to get the image id from a docker image - Stack Overflow
4: skopeo - Docker Registry v2 API tool - Linux Man Pages (1)
5: How to build a Docker image from a local Dockerfile? - Stack Overflow
NEW QUESTION # 20
Which of the following values would be valid in the FROM statement in aDockerfile?
Answer: C
NEW QUESTION # 21
What is the purpose of capabilities in the context of container virtualization?
Answer: E
Explanation:
Capabilities are a way of implementing fine-grained access control in Linux. They are a set of flags that define the privileges that a process can have. By default, a process inherits the capabilities of its parent, but some capabilities can be dropped or added by the process itself or by the kernel. In the context of container virtualization, capabilities are used to prevent processes from performing actions that might infringe the container, such as accessing the host's devices, mounting filesystems, changing the system time, or killing other processes. Capabilities allow containers to run with a reduced set of privileges, enhancing the security and isolation of the container environment. For example, Docker uses a default set of capabilities that are granted to the processes running inside a container, and allows users to add or drop capabilities as needed12.
References:
* Capabilities | Docker Documentation1
* Linux Capabilities: Making Them Work in Containers2
NEW QUESTION # 22
After creating a new Docker network using the following command:
docker network create --driver bridge isolated_nw
which parameter must be added todocker createin order to attach a container to the network?
Answer: A
Explanation:
Explanation
To attach a container to a network when creating it, the --network flag must be used with the name of the network as the argument. The --network flag specifies the network mode for the container. By default, the network mode is bridge, which means the container is connected to the default bridge network. However, if a custom network is created, such as isolated_nw in this case, the container must be explicitly attached to it using the --network flag. For example, to create a container named web1 and attach it to the isolated_nw network, the command would be:
docker create --name web1 --network isolated_nw nginx
The other options are not valid parameters for docker create. The --eth0, --ethernet, and --attach flags do not exist. The --alias flag is used to specify an additional network alias for the container on a user-defined network, but it does not attach the container to the network. References:
* docker network create | Docker Documentation1
* docker create | Docker Documentation
* Networking overview | Docker Docs2
NEW QUESTION # 23
Which of the following statements are true regarding hardware-based virtualization? (Choose TWO correct answers.)
Answer: A,D
Explanation:
Hardware-based virtualization usesCPU-assisted virtualization featuresto improve performance and isolation when running virtual machines. According to virtualization documentation, modern processors such asIntel VT-xandAMD-Vprovide special CPU instructions that allow the processor totrap and transfer control to the hypervisorwhen sensitive or privileged instructions are executed by a guest virtual machine.
This behavior makes statementAcorrect.
Additionally, hardware-based virtualizationrequires explicit CPU and chipset support, which is now standard in most modern x86-based systems. These hardware extensions reduce the need for complex software emulation and enable near-native performance for virtual machines. Therefore, statementCis also correct.
StatementBdescribes full software emulation rather than hardware-assisted virtualization and is incorrect in this context. StatementDis false because hardware-based virtualization is widely available and heavily used on x86 architectures in enterprise, cloud, and desktop environments.
Virtualization notes consistently highlight that hardware-based virtualization is the foundation for platforms such asKVM, Xen, VMware ESXi, and Hyper-V, making it a critical technology in modern computing.
Thus, the correct answers areA and C.
NEW QUESTION # 24
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