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| Section | Weight | Objectives |
|---|---|---|
| Full Virtualization | 25% | - Virtual Machine Disk Image Management - Virtualization Concepts and Theory - Libvirt Virtual Machine Management - Xen - QEMU |
| VM Deployment and Provisioning | 12% | - cloud-init - Cloud Management Tools - Packer - Vagrant |
| Container Virtualization | 25% | - LXC - Container Orchestration Platforms - Container Virtualization Concepts - Docker |
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NEW QUESTION # 72
What is the purpose of capabilities in the context of container virtualization?
Answer: B
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 # 73
What is the primary benefit of using Packer for creating machine images?
Answer: C
Explanation:
Packer is an image automation tool whose primary benefit is ensuring consistency across environments.
According to virtualization and DevOps documentation, Packer allows administrators to create identical machine images for development, testing, and production from a single configuration.
By using the same base image and build process, Packer eliminates configuration drift and ensures that environments behave consistently. This significantly reduces deployment issues caused by environmental differences and supports Infrastructure as Code best practices.
Packer does not monitor virtual machines or directly speed up application development. While it can indirectly simplify deployments, its main advantage is image consistency and repeatability.
Therefore, the correct answer is B.
NEW QUESTION # 74
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: C
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 # 75
Which of the following statements are true about sparse images in the context of virtual machine storage?
(Choose two.)
Answer: B,E
Explanation:
Explanation
Sparse images are a type of virtual disk images that grow in size as data is written to them, but do not shrink when data is deleted from them. Sparse images may consume an amount of space different from their nominal size, which is the maximum size that the image can grow to. For example, a sparse image with a nominal size of 100 GB may only take up 20 GB of physical storage if only 20 GB of data is written to it. Sparse images allocate backend storage at the first usage of a block, which means that the physical storage is only used when the virtual machine actually writes data to a block. This can save storage space and improve performance, as the image does not need to be pre-allocated or zeroed out.
Sparse images are not automatically shrunk when files within the image are deleted, because the virtual machine does not inform the host system about the freed blocks. To reclaim the unused space, a special tool such as virt-sparsify1 or qemu-img2 must be used to compact the image. Sparse images can be used with both full virtualization and paravirtualization, as the type of virtualization does not affect the format of the disk image. Sparse images are not automatically resized when their maximum capacity is about to be exceeded, because this would require changing the partition table and the filesystem of the image, which is not a trivial task. To resize a sparse image, a tool such as virt-resize3 or qemu-img2 must be used to increase the nominal size and the filesystem size of the image. References: 1 (search for "virt-sparsify"), 2 (search for
"qemu-img"), 3 (search for "virt-resize").
NEW QUESTION # 76
What is the purpose of capabilities in the context of container virtualization?
Answer: B
Explanation:
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 # 77
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