Oracle 1Z0-1084-20 Online Practice Questions and Exam Preparation

Oracle 1Z0-1084-20 Online Questions & Answers

• Question 1:

  Which pattern can help you minimize the probability of cascading failures in your system during partial loss of connectivity or a complete service failure?

  A. Retry pattern
  B. Anti-corruption layer pattern
  C. Circuit breaker pattern
  D. Compensating transaction pattern
  C. Circuit breaker pattern

  ---

  explanation:

  A cascading failure is a failure that grows over time as a result of positive feedback. It can occur when a portion of an overall system fails, increasing the probability that other portions of the system fail. the circuit breaker pattern prevents the service from performing an operation that is likely to fail. For example, a client service can use a circuit breaker to prevent further remote calls over the network when a downstream service is not functioning properly. This can also prevent the network from becoming congested by a sudden spike in failed retries by one service to another, and it can also prevent cascading failures. Self-healing circuit breakers check the downstream service at regular intervals and reset the circuit breaker when the downstream service starts functioning properly. https://blogs.oracle.com/developers/getting-started-with-microservices-part-three

• Question 2:

  Which two statements accurately describe Oracle SQL Developer Web on Oracle Cloud Infrastructure (OCI) Autonomous Database?

  A. It is available for databases with dedicated Exadata infrastructure only.
  B. After provisioning into an OCI compute Instance, it can automatically connect to the OCI Autonomous Databases instances.
  C. It is available for databases with both dedicated and shared Exadata infrastructure.
  D. It provides a development environment and a data modeler interface for OCI Autonomous Databases.
  E. It must be enabled via OCI Identity and Access Management policy to get access to the Autonomous Databases instances.
  A. It is available for databases with dedicated Exadata infrastructure only.
  D. It provides a development environment and a data modeler interface for OCI Autonomous Databases.

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  explanation:

  Oracle SQL Developer Web in Autonomous Data Warehouse provides a development environment and a data modeler interface for Autonomous Databases. SQL Developer Web is available for databases with both dedicated Exadata infrastructure and shared Exadata infrastructure. https://docs.cloud.oracle.com/en-us/iaas/Content/Database/Tasks/adbtools.htm

• Question 3:

  Which is NOT a supported SDK on Oracle Cloud Infrastructure (OCI)?

  A. Ruby SDK
  B. Java SDK
  C. Python SDK
  D. Go SDK
  E. .NET SDK
  E. .NET SDK

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  explanation:

  https://docs.cloud.oracle.com/en-us/iaas/Content/API/Concepts/sdks.htm

• Question 4:

  Given a service deployed on Oracle Cloud Infrastructure Container Engine far Kubernetes (OKE), which annotation should you add in the sample manifest file below to specify a 400 Mbps load balancer?

  

  A. service.beta.kubernetes.io/oci-load-balancer-value: 400Mbps
  B. service.beta.kubernetes.io/oci-load-balancer-size: 400Mbps
  C. service.beta.kubernetes.io/oci-load--balancer-shape: 4 00Mbps
  D. service, beta, kubernetes . io/oci-load--balancer-kind: 400Mbps
  C. service.beta.kubernetes.io/oci-load--balancer-shape: 4 00Mbps

• Question 5:

  What is the minimum amount of storage that a persistent volume claim can obtain In Oracle Cloud Infrastructure Container Engine for Kubemetes (OKE)?

  A. 1 TB
  B. 10 GB
  C. 1 GB
  D. 50 GB
  D. 50 GB

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  explanation:

  https://docs.cloud.oracle.com/en-us/iaas/Content/ContEng/Concepts/contengprerequisites.htm

• Question 6:

  What is the difference between blue/green and canary deployment strategies?

  A. In blue/green, application Is deployed In minor increments to a select group of people. In canary, both old and new applications are simultaneously in production.
  B. In blue/green, both old and new applications are in production at the same time. In canary, application is deployed Incrementally to a select group of people.
  C. In blue/green, current applications are slowly replaced with new ones. In < MW y, Application ll deployed incrementally to a select group of people.
  D. In blue/green, current applications are slowly replaced with new ones. In canary, both old and new applications are In production at the same time.
  B. In blue/green, both old and new applications are in production at the same time. In canary, application is deployed Incrementally to a select group of people.

  ---

  explanation:

  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. https://docs.cloudfoundry.org/devguide/deploy-apps/blue-green.html 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. ... Canaries were once regularly used in coal mining as an early warning system. https://octopus.com/docs/deployment-patterns/canary-deployments

• Question 7:

  What is the open source engine for Oracle Functions?

  A. Apache OpenWhisk
  B. OpenFaaS
  C. Fn Project
  D. Knative
  C. Fn Project

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  explanation:

  https://www.oracle.com/webfolder/technetwork/tutorials/FAQs/oci/Functions-FAQ.pdf Oracle Functions is a fully managed, multi-tenant, highly scalable, on-demand, Functions-as-a- Service platform. It is built on enterprise-grade Oracle 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.

• Question 8:

  Which one of the following is NOT a valid backend-type supported by Oracle Cloud Infrastructure (OCI) API Gateway?

  A. STOCK_RESPONSE_BACKEND
  B. ORACLE_FUNCTIONS_BACKEND
  C. ORACLE_STREAMS_BACKEND
  D. HTTP_BACKEND
  C. ORACLE_STREAMS_BACKEND

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  explanation:

  In the API Gateway service, a back end is the means by which a gateway routes requests to the back- end services that implement APIs. If you add a private endpoint back end to an API gateway, you give the API gateway access to the VCN associated with that private endpoint. You can also grant an API gateway access to other Oracle Cloud Infrastructure services as back ends. For example, you could grant an API gateway access to Oracle Functions, so you can create and deploy an API that is backed by a serverless function. API Gateway service to create an API gateway, you can create an API deployment to access HTTP and HTTPS URLs. https://docs.cloud.oracle.com/en-us/iaas/Content/APIGateway/ Tasks/apigatewayusinghttpbackend.htm API Gateway service to create an API gateway, you can create an API deployment that invokes serverless functions defined in Oracle Functions. https://docs.cloud.oracle.com/en-us/iaas/Content/APIGateway/Tasks/apigatewayusingfunctionsbackend.htm API Gateway service, you can define a path to a stock response back end https://docs.cloud.oracle.com/en-us/iaas/Content/ APIGateway/Tasks/apigatewayaddingstockresponses.htm

• Question 9:

  What can you use to dynamically make Kubernetes resources discoverable to public DNS servers?

  A. ExternalDNS
  B. CoreDNS
  C. DynDNS
  D. kubeDNS
  A. ExternalDNS

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  explanation:

  ExternalDNS allows you to control DNS records dynamically via Kubernetes resources in a DNS provider-agnostic way https://github.com/kubernetes-sigs/external-dns/blob/master/README.md https://github.com/kubernetes-sigs/external-dns/blob/master/docs/tutorials/oracle.md

• Question 10:

  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. Rolling Update
  B. Canary Deployment
  C. Blue/Green Deployment
  D. A/B Testing
  C. Blue/Green Deployment

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  explanation:

  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. 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. A/B testing is a way to compare two versions of a single variable, typically by testing a subject's response to variant A against variant B, and determining which of the two variants is more effective A rolling update offers a way to deploy the new version of your application gradually across your cluster.