1Z0-1084-21 Questions - Truly Beneficial For Your Oracle Exam (Updated 75 Questions)
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NEW QUESTION 32
With the volume of communication that can happen betweendifferent components in cloud-native applications, it is vital to not only test functionality, but also service resiliency.
Which statement is true with regards to service resiliency?
- A. Resiliency testing can be only done in a test environment.
- B. Resiliency is about recovering from failures without downtime or dataloss.
- C. A goal of resiliency is not to bring a service to a functioning state after a failure.
- D. Resiliency is about avoiding failures.
Answer: B
Explanation:
Explanation
Implement resilient applications:
Resiliency is the ability to (recover) from failures and continue to function. It isn't about avoiding failures but accepting the fact that failures will happen and responding to them in a way that avoids downtime or data loss. The goal of resiliency is to return the application to a fully functioning state after a failure.
References:
https://docs.microsoft.com/en-us/dotnet/architecture/microservices/implement-resilient-applications/
NEW QUESTION 33
What is the minimum of storage that a persistent volume claim can obtain in Oracle Cloud Infrastructure Container Engine for Kubernetes (OKE)?
- A. 1 GB
- B. 1 TB
- C. 10 GB
- D. 50 GB
Answer: D
Explanation:
Explanation
The minimum amount of persistent storage that a PVC can request is 50 gigabytes. If the request is for less than 50 gigabytes, the request is rounded up to 50 gigabytes.
https://docs.cloud.oracle.com/en-us/iaas/Content/ContEng/Tasks/contengcreatingpersistentvolumeclaim.htm
NEW QUESTION 34
You encounter an unexpected error when invoking the Oracle Function named "myfunction" in application
"myapp". Which can you use to get more information on the error?
- A. fn --verbose invoke myapp myfunction
- B. DEBOG=1 fn invoke myapp myfunction
- C. Call Oracle support with your error message
- D. fn --debug invoke myapp myfunction
Answer: B
Explanation:
Explanation
Troubleshooting Oracle Functions
If you encounter an unexpected error when using an Fn Project CLI command, you can find out more about the problem by starting the command with the string DEBUG=1 and running the command again. For example:
$ DEBUG=1 fn invoke helloworld-app helloworld-func
Note that DEBUG=1 must appear before the command, and that DEBUG must be in upper case.
NEW QUESTION 35
Which is NOT a supported SDk Oracle Cloud Infrastructure (OCI)?
- A. Go SDK
- B. NET SDK
- C. Ruby SDK
- D. Java SDK
- E. Python SDK
Answer: B
Explanation:
Explanation
https://docs.cloud.oracle.com/en-us/iaas/Content/API/Concepts/sdks.htm
* Software Development Kits (SDKs)Build and deploy apps that integrate with Oracle Cloud Infrastructure services. Each SDK provides the tools you need to develop an app, including code samples and documentation tocreate, test, and troubleshoot. In addition, if you want to contribute to the development of the SDKs, they are all open source and available on GitHub.
* SDK for Java
* Python SDK
* Ruby SDK
* Go SDK
https://docs.cloud.oracle.com/en-us/iaas/Content/API/Concepts/sdkconfig.htm
NEW QUESTION 36
What is one of the differences between a microservice and a serverless function?
- A. Microservices always use a data storeand serverless functions never use a data store.
- B. Microservices are stateless and serverless functions are stateful.
- C. Microservices are used for long running operations and serverless functions for short running operations.
- D. Microservices are triggered by events and serverless functions are not.
Answer: C
Explanation:
Explanation
microservice is larger and can do more than a function. A function is a relatively small bit of code that performs only one action in response to an event.
Many microservices can run on several servers, and different instances of a specific microservice can run on several servers.
In many cases, microservices can be decomposed into a number of smaller stateless functions. The difference between microservices and functions is not simply the size. Functions are stateless, and they require no knowledge about or configuration of the underlying server-hence, the term serverless.
Microservices are best suited for long-running, complex applications that have significant resource and management requirements. You can migrate an existing monolithic application to microservices, which makes it easier to modularly develop features for the application and deploy it in the cloud. Microservices are also a good choice for building e-commerce sites, as they can retain information throughout a transaction and meet the needs of a 24/7 customer base.
On the other hand, serverless functions only execute when needed. Once the execution is over, the computing instance that runs the code decommissions itself. Serverless aligns with applications that are event driven, especially when the events are sporadic and the event processingis not resource-intensive. Serverless is a good choice when developers need to deploy fast and there are minimal application scaling concerns. For example, a good use of serverless computing is a scheduled task that needs to perform some data aggregation and will execute for just a few seconds.
References:
https://www.cloudflare.com/learning/serverless/glossary/serverless-microservice/
https://developer.oracle.com/java/fn-project-introduction.html
https://searchapparchitecture.techtarget.com/answer/When-should-I-choose-between-serverless-and-microservice
NEW QUESTION 37
Which statement accurately describes Oracle Cloud Infrastructure (OCI) Load Balancer integration with OCI Container Engine for Kubernetes (OKE)?
- A. OKE service provisions a single OCI Load Balancer instance shared with all the Kubernetes services with LoadBalancer type in the YAML configuration.
- B. OKE service provisions an OCI Load Balancer instance for each Kubernetes service with LoadBalancer type in the YAML configuration.
- C. OCI Load Balancer instance must be manually provisioned for each Kubernetesservice that requires traffic balancing.
- D. OCI Load Balancer instance provisioning is triggered by OCI Events service for each Kubernetes service with LoadBalancer type in the YAML configuration.
Answer: A
Explanation:
Explanation
If you are running your Kubernetes cluster on Oracle Container Engine for Kubernetes (commonly known as OKE), you can have OCI automatically provision load balancers for you by creating a Service of type LoadBalancer instead of (or in addition to) installing an ingress controller like Traefik or Voyage YAML file
When you apply this YAML file to your cluster, you will see the new service is created. After a short time (typically less than a minute) the OCI Load Balancer will be provisioned.
https://oracle.github.io/weblogic-kubernetes-operator/faq/oci-lb/
NEW QUESTION 38
Which two handle Oracle Functionsauthentication automatically?
- A. Oracle Cloud Infrastructure SDK
- B. Signed HTTP Request
- C. Fn Project CLI
- D. cURL
- E. Oracle Cloud Infrastructure CLl
Answer: C,E
Explanation:
Explanation
If you use the Fn Project CLI or the Oracle Cloud Infrastructure CLI to invoke a function, authentication is handled for you. See Using the Fn Project CLI to Invoke Functions and Using the Oracle Cloud Infrastructure CLI to Invoke Functions.
If you use an Oracle Cloud Infrastructure SDK to invoke a function, you can use the SDK to handle authentication. See Using SDKs to Invoke Functions.
If you make a signed HTTP request to a function's invoke endpoint, you'll have to handleauthentication yourself by including a signature and the OCID of the compartment to which the function belongs in the request header Fn Project CLI you can create an Fn Project CLI Context to Connect to Oracle Cloud Infrastructure and specify --provider oracle This option enables Oracle Functions to perform authentication and authorization using Oracle Cloud Infrastructure request signing, private keys, user groups, and policies that grant permissions to those user groups.
References:
https://blogs.oracle.com/developers/oracle-functions-invoking-functions-automatically-with-cloud-events
https://docs.cloud.oracle.com/en-us/iaas/Content/Functions/Tasks/functionsinvokingfunctions.htm
NEW QUESTION 39
How can you find details of the tolerations field for the sample YAML file below?
- A. kubectl describe pod.spec tolerations
- B. kubectl get pod.spec.tolerations
- C. kubectl list pod.spec.tolerations
- D. kubectl explain pod.spec.tolerations
Answer: D
Explanation:
kubectl explain to List the fields for supported resources
explainkubectl explain [--recursive=false] [flags]Get documentation of various resources. For instance pods, nodes, services, etc.
References:
https://kubernetes.io/docs/reference/generated/kubectl/kubectl-commands#explain
https://kubernetes.io/docs/reference/kubectl/cheatsheet/
NEW QUESTION 40
You have deployed a Python application on Oracle Cloud Infrastructure Container Engine for Kubernetes.
However, during testing you found a bug that you rectified and created a new Docker image. You need to make sure that if this new Image doesn't work then you can roll back to the previous version.
Using kubectl, which deployment strategies should you choose?
- A. Blue/Green Deployment
- B. Canary Deployment
- C. A/B Testing
- D. Rolling Update
Answer: A
Explanation:
Explanation
Using Blue-Green Deployment to Reduce Downtime and Risk:
>Blue-green deployment is a technique that reduces downtime and risk by running two identical production environments called Blue and Green. At any time, only one of the environments is live, with the live environment serving all production traffic. For this example, Blue is currently live and Green is idle.
This technique can eliminate downtime due to app deployment. In addition, blue-green deployment reduces risk: if something unexpected happens with your new version on Green, you can immediately roll back to the last version by switching back to Blue.
>Canary deployments are a pattern for rolling out releases to a subset of users or servers. The idea is to first deploy the change to a small subset of servers, test it, and then roll the change out to the rest of the servers.
The canary deployment serves as an early warning indicator with less impact on downtime: if the canary deployment fails, the rest of the servers aren't impacted.
>A/B testing is a way to compare two versions of a singlevariable, typically by testing a subject's response to variant A against variant B, and determining which of the two variants is more effective
>Rolling update offers a way to deploy the new version of your application gradually across your cluster.
References:
https://docs.cloudfoundry.org/devguide/deploy-apps/blue-green.html
NEW QUESTION 41
You are developing a polyglot serverless application using Oracle Functions. Which language cannot be used to write your function code?
- A. Python
- B. PL/SQL
- C. Java
- D. Node.js
Answer: B
Explanation:
Explanation
Overviewof Functions:
The serverless and elastic architecture of Oracle Functions means there's no infrastructure administration or software administration for you to perform. You don't provision or maintain compute instances, and operating system softwarepatches and upgrades are applied automatically. Oracle Functions simply ensures your app is highly-available, scalable, secure, and monitored. With Oracle Functions, you can write code in Java, Python, Node, Go, and Ruby (and for advanced use cases, bringyour own Dockerfile, and Graal VM). You can then deploy your code, call it directly or trigger it in response to events, and get billed only for the resources consumed during the execution.
References:
https://docs.cloud.oracle.com/en-us/iaas/Content/Functions/Concepts/functionsoverview.htm
NEW QUESTION 42
How do you perform a rolling update in Kubernetes?
- A. kubect1 update -c <container>
- B. kubect1 upgrade <deployment-name> -image=*image:v2
- C. kubect1 rolling-update
- D. kubect1 rolling-update <deployment-name> -image=image
Answer: B
Explanation:
Explanation
https://docs.oracle.com/en/cloud/iaas/wercker-cloud/wercm/quickstarts/platforms/kubernetes/
NEW QUESTION 43
You are working on a cloud native e-commerce application on Oracle Cloud Infrastructure (OCI). Your application architecture has multiple OCI services, including Oracle Functions. You need to trigger these functions directly from other OCI services, without having to run custom code.
Which OCI service cannot trigger your functions directly?
- A. OCI Events Service
- B. OCI Registry
- C. OCI API Gateway
- D. Oracle Integration
Answer: B
Explanation:
Explanation
Overview of Functions:
Oracle Functions is a fully managed, multi-tenant, highly scalable, on-demand, Functions-as-a-Service platform. It is built on enterprise-gradeOracle Cloud Infrastructure and powered by the Fn Project open source engine. Use Oracle Functions (sometimes abbreviated to just Functions) when you want to focus on writing code to meet business needs.
The serverless and elastic architecture of Oracle Functions means there's no infrastructure administration or software administration for you to perform. You don't provision or maintain compute instances, and operating system software patches and upgrades are applied automatically. Oracle Functions simply ensures your app is highly-available, scalable, secure, and monitored. With Oracle Functions, you can write code in Java, Python, Node, Go, and Ruby (and for advanced use cases, bring your own Dockerfile, and Graal VM).
You can invoke a function that you'vedeployed to Oracle Functions from:
- The Fn Project CLI.
- The Oracle Cloud Infrastructure SDKs.
- Signed HTTP requests to the function's invoke endpoint. Every function has an invoke endpoint.
- Other Oracle Cloud services (for example, triggered by an event in the Events service) or from external services.
so You can then deploy your code, call it directly or trigger it in response to events, and get billed only for the resources consumed during the execution.
Invoking Oracle Functions from Other OracleCloud Infrastructure Services:
You can invoke functions in Oracle Functions from other Oracle Cloud Infrastructure services. Typically, you'll want an event in another service to trigger a request to invoke a function defined in Oracle Functions.
This functionality is currently available in:
A:The Events service. For more information, see Overview of Events.
B:The Notifications service. For more information, see Notifications Overview. For a scenario, see Scenario A: Automatically Resize VMs.
C:The API Gateway service. For more information, see Adding a Function in Oracle Functions as an API Gateway Back End.
D:The Oracle Integration service, using the OCI Signature Version 1 security policy. For more information, see Configure Oracle Integration to CallOracle Cloud Infrastructure Functions with the REST Adapter in Using the REST Adapter with Oracle Integration.
so OCI Registry services cannot trigger yourfunctions directly
References:
https://docs.cloud.oracle.com/en-us/iaas/Content/Functions/Tasks/functionsintegratingwithother.htm
https://docs.cloud.oracle.com/en-us/iaas/Content/Functions/Concepts/functionsoverview.htm
https://blogs.oracle.com/cloud-infrastructure/announcing-notifications-triggers-for-serverless-functions
NEW QUESTION 44
You are developing a serverless application with Oracle Functions and Oracle Cloud Infrastructure Object Storage- Your function needs to read a JSON file object from an Object Storage bucket named"input-bucket" in compartment "qa-compartment". Your corporate security standards mandate the use of Resource Principals for this use case.
Which two statements are needed to implement this use case?
- A. No policies are needed. By default, every function has read access to Object Storage buckets in the tenancy
- B. Set up a policy to grant all functions read access to the bucket:
allow all functions in compartment qa-compartment to read objects in target.bucket.name='input-bucket' - C. Set up a policy to grant your user account read access to the bucket:
allow user XYZ to read objects in compartment qa-compartment where target .bucket, name-'input-bucket' - D. Set up a policy with the following statement to grant read access to the bucket:
allow dynamic-group read-file-dg to read objects in compartment qa-compartment where target .bucket
.name=' input-bucket * - E. Set up the following dynamic group for your function's OCID: Name: read-file-dg Rule: resource. id = ' ocid1. f nf unc. ocl -phx. aaaaaaaakeaobctakezj z5i4uj j 7g25q7sx5mvr55pms6f
4da !
Answer: D,E
Explanation:
Explanation
When a function you've deployed to Oracle Functions is running, it can access other Oracle Cloud Infrastructure resources. For example:
- You might want a function to get alist of VCNs from the Networking service.
- You might want a function to read data from an Object Storage bucket, perform some operation on the data, and then write the modified data back to the Object Storage bucket.
To enable a function to access anotherOracle Cloud Infrastructure resource, you have to include the function in a dynamic group, and then create a policy to grant the dynamic group access to that resource.
https://docs.cloud.oracle.com/en-us/iaas/Content/Functions/Tasks/functionsaccessingociresources.htm
NEW QUESTION 45
Which header is NOT required when signing GET requests to Oracle Cloud Infrastructure APIs?
- A. host
- B. date or x-date
- C. content-type
- D. (request-target)
Answer: C
Explanation:
Explanation
Authorization Header
The Oracle Cloud Infrastructure signature uses the "Signature"Authentication scheme (with an Authorization header), and not the Signature HTTP header.
This section describes the headers that must be included in the signing string:
For GET and DELETE requests (when there's no content in the request body), the signingstring must include at least these headers:
(request-target)
host
date or x-date (if both are included, Oracle uses x-date)
For PUT and POST requests (when there's content in the request body), the signing string must include at least these headers:
(request-target)
host
date or x-date (if both are included, Oracle uses x-date)
x-content-sha256 (except for Object Storage PUT requests; see the next section) content-type content-length References:
https://docs.cloud.oracle.com/en-us/iaas/Content/API/Concepts/signingrequests.htm
NEW QUESTION 46
You created a pod called "nginx" and its state is set to Pending.
Which command can you run to see the reason why the "nginx" pod is in the pending state?
- A. kubect2 get pod nginx
- B. kubect2 describe pod nginx
- C. kubect2 logs pod nginx
- D. Through the Oracle Cloud Infrastructure Console
Answer: B
Explanation:
Explanation
Debugging Pods
The first step in debugging a pod is taking a look at it. Check the current state of the pod and recent events with the following command:
kubectl describe pods ${POD_NAME}
Look at the state of the containers in the pod. Are they all Running? Have therebeen recent restarts?
Continue debugging depending on the state of the pods.
My pod stays pending
If a pod is stuck in Pending it means that it can not be scheduled onto a node. Generally this is because there are insufficient resources of one type oranother that prevent scheduling. Look at the output of the kubectl describe ... command above. There should be messages from the scheduler about why it can not schedule your pod.
https://kubernetes.io/docs/tasks/debug-application-cluster/debug-pod-replication-controller/
NEW QUESTION 47
Which two arerequired to enable Oracle Cloud Infrastructure (OCI) Container Engine for Kubernetes (OKE) cluster access from the kubect1 CLI?
- A. A configured OCI API signing key pair
- B. OCI Identity and Access Management Auth Token
- C. Install and configure the OCI CLI
- D. An SSH key pair with the public key added to cluster worker nodes
- E. Tiller enabled on the OKE cluster
Answer: A,C
Explanation:
Explanation
Setting Up Local Access to Clusters
To set up a kubeconfig file to enable access to a cluster using a local installation of kubectl and theKubernetes Dashboard:
Step 1: Generate an API signing key pair
Step 2: Upload the public key of the API signing key pair
Step 3: Install and configure the Oracle Cloud Infrastructure CLI
Step 4: Set up the kubeconfig file
Step 5: Verify that kubectl can access the cluster
References:
https://docs.cloud.oracle.com/en-us/iaas/Content/ContEng/Tasks/contengdownloadkubeconfigfile.htm
NEW QUESTION 48
Which concepthe following steps reference Console instructionsCloud Infrastructure Resource Manager?
- A. Stack
- B. Plan
- C. Queue
- D. Job
Answer: C
Explanation:
Explanation
https://docs.cloud.oracle.com/en-us/iaas/Content/ResourceManager/Concepts/resourcemanager.htm Following are brief descriptions of key concepts and the main components of Resource Manager.
CONFIGURATION
Information to codify your infrastructure. A Terraform configuration can be either a solution or a file that you write and upload.
JOB
Instructions to perform the actions defined in your configuration. Only one job at a time can run on a given stack; further, you can have only one set of Oracle Cloud Infrastructure resources on a given stack. To provision a different set of resources, you must create a separate stack and use a different configuration.
Resource Manager provides the following job types:
Plan: Parses your Terraform configuration and creates an execution plan for the associated stack. The execution plan lists the sequence of specific actions planned to provision your Oracle Cloud Infrastructure resources. The execution plan is handed off to the apply job, which then executes the instructions.
Apply. Applies the execution plan to theassociated stack to create (or modify) your Oracle Cloud Infrastructure resources. Depending on the number and type of resources specified, a given apply job can take some time. You can check status while the job runs.
Destroy. Releases resources associated with a stack. Released resources are not deleted. For example, terminates a Compute instance controlled by a stack. The stack's job history and state remain after running a destroy job. You can monitor the status and review the results of a destroy job by inspecting the stack's log files.
Import State. Sets the provided Terraform state file as the current state of the stack. Use this job to migrate local Terraform environments to Resource Manager.
STACK
The collection of Oracle Cloud Infrastructure resources corresponding to a given Terraform configuration.
Each stack resides in the compartment you specify, in a single region;however, resources on a given stack can be deployed across multiple regions. An OCID is assigned to each stack.
the following steps reference Console instructions
Create a Terraform configuration.
Create a stack.
Run a plan job, which produces an executionplan.
Review the execution plan.
If changes are needed in the execution plan, update the configuration and run a plan job again.
Run an apply job to provision resources.
Review state file and log files, as needed.
You can optionally reapply your configuration, with or without making changes, by running an apply job again.
Optionally, to release the resources running on a stack, run a destroy job.
NEW QUESTION 49
Which one of the statements describes a service aggregator pattern?
- A. It isimplemented in each service separately and uses a streaming service
- B. It involves sending events through a message broker
- C. It uses a queue on both sides of the service communication
- D. It involves implementing a separate service that makes multiple calls to other backend services
Answer: D
Explanation:
Explanation
Service Aggregator Pattern
Another option for eliminating microservice-to-microservice coupling is an Aggregator microservice, shown in purple in Figure 4-10.
The pattern isolates an operation that makes calls to multiple back-end microservices, centralizing its logic into a specialized microservice.The purple checkout aggregator microservice in the previous figure orchestrates the workflow for the Checkout operation. It includes calls to several back-end microservices in a sequenced order. Data from the workflow is aggregated and returned to the caller. While it still implements direct HTTP calls, the aggregator microservice reduces direct dependencies among back-end microservices.
References:
https://docs.microsoft.com/en-us/dotnet/architecture/cloud-native/service-to-service-communication#:~:text=Ser
NEW QUESTION 50
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