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| Section | Weight | Objectives |
|---|---|---|
| Container Virtualization | 25% | - Container Orchestration Platforms - LXC - Docker - Container Virtualization Concepts |
| Full Virtualization | 25% | - Libvirt Virtual Machine Management - Virtual Machine Disk Image Management - QEMU - Virtualization Concepts and Theory - Xen |
| VM Deployment and Provisioning | 12% | - cloud-init - Packer - Vagrant - Cloud Management Tools |
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NEW QUESTION # 72
What is the primary advantage of container virtualization compared to traditional virtualization?
Answer: C
Explanation:
The primary advantage of container virtualization isfaster startup times. Containers share the host OS kernel and do not require booting a full guest operating system, allowing them to start in seconds or milliseconds.
While containers also use fewer resources, the most commonly cited primary benefit in documentation is rapid startup and scalability, makingBthe correct answer.
NEW QUESTION # 73
Which of the following mechanisms are used by LXC and Docker to create containers? (Choose three.)
Answer: A,B,D
Explanation:
Explanation
LXC and Docker are both container technologies that use Linux kernel features to create isolated environments for running applications. The main mechanisms that they use are:
* Linux Capabilities: These are a set of privileges that can be assigned to processes to limit their access to certain system resources or operations. For example, a process with the CAP_NET_ADMIN capability can perform network administration tasks, such as creating or deleting network interfaces. Linux
* capabilities allow containers to run with reduced privileges, enhancing their security and isolation.
* Kernel Namespaces: These are a way of creating separate views of the system resources for different processes. For example, a process in a mount namespace can have a different file system layout than the host or other namespaces. Kernel namespaces allow containers to have their own network interfaces, process IDs, user IDs, and other resources, without interfering with the host or other containers.
* Control Groups: These are a way of grouping processes and applying resource limits and accounting to them. For example, a control group can limit the amount of CPU, memory, disk I/O, or network bandwidth that a process or a group of processes can use. Control groups allow containers to have a fair share of the system resources and prevent them from exhausting the host resources.
POSIX ACLs and file system permissions are not mechanisms used by LXC and Docker to create containers.
They are methods of controlling the access to files and directories on a file system, which can be applied to any process, not just containers.
References:
* LXC vs Docker: Which Container Platform Is Right for You?
* LXC vs Docker: Why Docker is Better in 2023 | UpGuard
* What is the Difference Between LXC, LXD and Docker Containers
* lxc - Which container implementation docker is using - Unix & Linux Stack Exchange
NEW QUESTION # 74
Which of the following statements are true regarding IaaS computing instances? (Choose TWO correct answers.)
Answer: B,D
Explanation:
Infrastructure as a Service (IaaS) provides on-demand virtual computing resources that can be dynamically created and destroyed. According to cloud computing documentation, IaaS instances are designed to be ephemeral, allowing users to launch instances when needed and terminate them when no longer required. This makes statement A correct.
Additionally, IaaS platforms expose APIs and service interfaces that enable full automation of instance lifecycle management. Instances can be created, modified, and deleted programmatically using scripts, orchestration tools, or cloud SDKs, making statement B correct.
Statement C is incorrect because root disks are often ephemeral unless explicitly configured as persistent volumes. Statement D contradicts the elastic nature of IaaS, and statement E is false because users may have zero, one, or many instances.
Therefore, the correct answers are A and B.
NEW QUESTION # 75
If aDockerfilecontains the following lines:
WORKDIR /
RUN cd /tmp
RUN echo test > test
where is the filetestlocated?
Answer: A
Explanation:
Explanation
The WORKDIR instruction sets the working directory for any subsequent RUN, CMD, ENTRYPOINT, COPY and ADD instructions that follow it in the Dockerfile1. The RUN instruction executes commands in a new layer on top of the current image and commits the results2. The RUN cd command does not change the working directory for the next RUN instruction, because each RUN command runs in a new shell and a new environment3. Therefore, the file test is created in the root directory (/) of the container image, not in the /tmp directory. References:
* Dockerfile reference: WORKDIR
* Dockerfile reference: RUN
* difference between RUN cd and WORKDIR in Dockerfile
NEW QUESTION # 76
FILL BLANK
What LXC command lists containers sorted by their CPU, block I/O or memory consumption? (Specify ONLY the command without any path or parameters.)
Answer:
Explanation:
lxc-top
Explanation
LXD supports the following network interface types for containers: macvlan, bridged, physical, sriov, and ovn1. Macvlan creates a virtual interface on the host that is connected to the same network as the parent interface2. Bridged connects the container to a network bridge that acts as a virtual switch3. Physical attaches the container to a physical network interface on the host2. Ipsec and wifi are not valid network interface types for LXD containers. References:
* 1: Bridge network - Canonical LXD documentation
* 2: How to create a network - Canonical LXD documentation
* 4: LXD containers and networking with static IP - Super User
NEW QUESTION # 77
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