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Docker DCA證照 - DCA考試大綱

順便提一下，可以從雲存儲中下載Testpdf DCA考試題庫的完整版：https://drive.google.com/open?id=1CNW8OWs5yWv9ufh0MR-q2PFbGP6Dxxh-

Testpdf長年以來一直向大家提供關于IT認證考試相關的學習資料。Docker的DCA題庫由世界各地的資深IT工程師組成的專業團隊制作完成，包含最新的考試試題，并附有全部正確的答案，幫助考生通過他們認為很難的DCA考試。這樣可以節約考生的時間和金錢，大多數的考生都選擇這樣的方式來獲得DCA認證，并節省了很多的時間和努力。您需要是在反復練習這份真題的基礎上，多思考，多總結，通過DCA考試就沒有問題了。

每個人都有自己的人生規劃，選擇不同得到的就不同，所以說選擇很重要。Testpdf Docker的DCA考試認證培訓資料是幫助每個IT人士實現自己人生宏偉目標的最好的方式方法，它包括了試題及答案，並且和真實的考試題目不相上下，真的是所謂稱得上是最好的別無二選的培訓資料。

>> Docker DCA證照 <<

免費PDF Docker DCA：Docker Certified Associate (DCA) Exam證照 - 最佳的Testpdf DCA考試大綱

不同的方式是可以達到相同的目的的，就看你選擇什麼樣的方式，走什麼樣的路。很多人都想通過Docker DCA 認證考試來使自己的工作和生活有所提升，但是參加過Docker DCA 認證考試的人都知道通過Docker DCA 認證考試不是很簡單。有的人為了能通過Docker DCA 認證考試花費了很多寶貴的時間和精力卻沒有成功。

最新的 Docker Certified Associate DCA 免費考試真題 (Q28-Q33):

問題 #28
Does this describe the role of Control Groups (cgroups) when used with a Docker container?
Solution: role-based access control to clustered resources

• A. Yes
• B. No

答案：B

解題說明：
Explanation
= The role of Control Groups (cgroups) when used with a Docker container is not role-based access control to clustered resources. Cgroups are a feature of the Linux kernel that allow you to limit, manage, and isolate resource usage of collections of processes running on a system1. Resources are CPU time, system memory, network bandwidth, or combinations of these resources, and so on2. Cgroups allow Docker Engine to share available hardware resources to containers and optionally enforce limits and constraints3. Cgroups can help avoid "noisy neighbor" issues and improve the performance and security of containers4. Role-based access control (RBAC) is a different conceptthat refers to controlling access to resources based on the roles of individual users within an organization5.
References: : Lab: Control Groups (cgroups) | dockerlabs : Container security fundamentals part 4: Cgroups | Datadog Security Labs : Docker Namespace Vs Cgroup. Namespace and Cgroup | by MrDevSecOps - Medium : Role-based access control - Wikipedia : Control groups (cgroups) - Learn Docker - Fundamentals of Docker 18.x ...

 

問題 #29
A Kubernetes node is allocated a /26 CIDR block (64 unique IPs) for its address space.
If every pod on this node has exactly two containers in it, how many pods can this address space support on this node?

• A. 0
• B. 64 for every service routing to pods on this node
• C. 1
• D. 2
• E. 32 in every Kubernetes namespace

答案：A

解題說明：
A Kubernetes node is allocated a /26 CIDR block (64 unique IPs) for its address space. This means that the node can assign up to 64 IP addresses to its resources, such as pods and containers. If every pod on this node has exactly two containers in it, then each pod will need two IP addresses, one for each container. Therefore, the node can support up to 32 pods, since 64 / 2 = 32. The other options are incorrect because they either exceed the available IP addresses or do not account for the number of containers per pod. Reference:
* CIDR Blocks and Container Engine for Kubernetes - Oracle
* How kubernetes assigns podCIDR for nodes? - Stack Overflow

 

問題 #30
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"

• A. Yes
• B. No

答案：B

解題說明：
Explanation
The command docker service create -name dns-cache -p 53:53 -constraint networking.protocol.udp=true dns-cache will not create a swarm service that only listens on port 53 using the UDP protocol. This command has several syntax errors and invalid options. The correct syntax for creating a swarm service is docker service create [OPTIONS] IMAGE [COMMAND] [ARG...]1. The correct options for specifying the service name, port mapping, and network mode are --name, --publish, and --network respectively1. The option -constraint is not a valid option for the docker service create command. To create a swarm service that only listens on port
53 using the UDP protocol, you need to use the --publish option with
the protocol=udp and mode=host parameters, and the --network option with the host value23. For example, the following command creates a global service using host mode and bypassing the routing mesh2:
docker service create --name dns-cache
--publish published=53,target=53,protocol=udp,mode=host
--mode global
--network host
dns-cache
References:
* 1: docker service create | Docker Docs
* 2: Use swarm mode routing mesh | Docker Docs
* 3: Manage swarm service networks | Docker Docs

 

問題 #31
Will this configuration achieve fault tolerance for managers in a swarm?
Solution: an odd number of manager nodes, totaling more than two

• A. Yes
• B. No

答案：A

 

問題 #32
The Kubernetes yaml shown below describes a networkPolicy.

Will the networkPolicy BLOCK this trafftc?
Solution. a request issued from a pod bearing only the tier: frontend label, to a pod bearing the tier: backend label

• A. Yes
• B. No

答案：A

解題說明：
The provided Kubernetes NetworkPolicy YAML configuration indicates that the policy applies to pods with the label tier: backend in the default namespace1. The ingress rule allows traffic from pods with the label tier:
api1. Therefore, a request issued from a pod bearing only the tier: frontend label to a pod bearing the tier:
backend label will be blocked by this networkPolicy1. This is because the networkPolicy does not have a rule allowing ingress from pods with the tier: frontend label1. For more information on Kubernetes NetworkPolicies, you can refer to the Kubernetes Documentation on Network Policies.

 

問題 #33
......

我們Testpdf不僅僅提供優質的產品給每位DCA考生，而且提供完善的售後服務給每位考生，如果你使用了我們的產品，我們將讓你享受一年免費的更新，並且在第一時間回饋給每位考生，讓你及時得到更新的最新的考試資料，以最大效益的服務給每位DCA考生。

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Docker Certified Associate (DCA) Exam 的官方解释是：Docker Certified Associate (DCA) Exam 是一项全球认证，DCA可验证您执行核心安全功能和追求IT安全职业所需的基本技能，畢業的壓力，讓每位學生都糾心，在現今這個社會中唯有讓自己手中的證書更多一些，才能有很多的機遇。

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