DCA Exam PDF [2024] Tests Free Updated Today with Correct 169 Questions [Q36-Q55]

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DCA Exam PDF [2024] Tests Free Updated Today with Correct 169 Questions

Docker DCA Exam Preparation Guide and PDF Download

QUESTION 36
Is this an advantage of multi-stage builds?
Solution: better caching when building Docker images

Yes

QUESTION 37
A company’s security policy specifies that development and production containers must run on separate nodes in a given Swarm cluster.
Can this be used to schedule containers to meet the security policy requirements?
Solution: label contraints

Yes

QUESTION 38
You are troubleshooting a Kubernetes deployment called api, and want to see the events table for this object.
Does this command display it?
Solution: kubectl describe deployment api

Yes

QUESTION 39
Does this describe the role of Control Groups (cgroups) when used with a Docker container?
Solution: accounting and limiting of resources

Yes

QUESTION 40
The following Docker Compose file is deployed as a stack:

Is this statement correct about this health check definition?
Solution: Health checks test for app health ten seconds apart. If the test fails, the container will be restarted three times before it gets rescheduled.

Yes

QUESTION 41
Does this command create a swarm service that only listens on port 53 using the UDP protocol?
Solution. ‘docker service create -name dns-cache -p 53:53 -constraint networking.protocol.udp=true dns-cache”

Yes

QUESTION 42
Is this statement correct?
Solution: A Dockerfile stores the Docker daemon’s configuration options.

Yes

QUESTION 43
Does this describe the role of Control Groups (cgroups) when used with a Docker container?
Solution: role-based access control to clustered resources

Yes

QUESTION 44
In the context of a swarm mode cluster, does this describe a node?
Solution: a physical machine participating in the swarm

Yes

QUESTION 45
Is this a type of Linux kernel namespace that provides container isolation?
Solution.Process ID

Yes

QUESTION 46
The Kubernetes yaml shown below describes a clusterIP service.

Is this a correct statement about how this service routes requests?
Solution: Traffic sent to the IP of this service on port 8080 will be routed to port 80 in a random pod with the label aPP: nginx.

Yes

QUESTION 47
Can this set of commands identify the published port(s) for a container?
Solution. ‘docker container inspect”, docker port’

Yes

QUESTION 48
Which networking drivers allow you to enable multi-host network connectivity between containers?

macvlan, ipvlan, and overlay

bridge, user-defined, host

bridge, macvlan, ipvlan, overlay

host, macvlan, overlay, user-defined

QUESTION 49
Is this statement correct?
Solution.A Dockerfile stores persistent data between deployments of a container

Yes

QUESTION 50
Will this command ensure that overlay traffic between service tasks is encrypted?
Solution.docker network create -d overlay –secure <network-name>

Yes

QUESTION 51
Will this command display a list of volumes for a specific container?
Solution: docker volume logs nginx –containers’

Yes

QUESTION 52
Which networking drivers allow you to enable multi-host network connectivity between containers?

macvlan, ipvlan, and overlay

bridge, user-defined, host

host, macvlan, overlay, user-defined

bridge, macvlan, ipvlan, overlay

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 usedifferent 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

QUESTION 53
You are troubleshooting a Kubernetes deployment called api, and want to see the events table for this object. Does this command display it?
Solution: kubectl describe deployment api

Yes

QUESTION 54
Can this set of commands identify the published port(s) for a container?
Solution. ‘docker container inspect”, docker port’

Yes

QUESTION 55
Will this configuration achieve fault tolerance for managers in a swarm?
Solution: an odd number of manager nodes, totaling more than two

Yes