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

Oracle 1Z0-1084-20 Online Questions & Answers

• Question 61:

  What is one of the differences between a microservice and a serverless function?

  A. Microservices are used for long running operations and serverless functions for short running operations.
  B. Microservices always use a data store and serverless functions never use a data store.
  C. Microservices are stateless and serverless functions are stateful.
  D. Microservices are triggered by events and serverless functions are not.
  A. Microservices are used for long running operations and serverless functions for short running operations.

  ---

  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. 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. https://developer.oracle.com/java/fn-project-introduction.html

• Question 62:

  Which statement accurately describes Oracle Cloud Infrastructure (OCI) Load Balancer integration with OCI Container Engine for Kubernetes (OKE)?

  A. OKE service provisions an OCI Load Balancer instance for each Kubernetes service with LoadBalancer type in the YAML configuration.
  B. OCI Load Balancer instance provisioning is triggered by OCI Events service for each Kubernetes service with LoadBalancer type in the YAML configuration.
  C. OCI Load Balancer instance must be manually provisioned for each Kubernetes service that requires traffic balancing.
  D. OKE service provisions a single OCI Load Balancer instance shared with all the Kubernetes services with LoadBalancer type in the YAML configuration.
  D. OKE service provisions a single OCI Load Balancer instance shared with all the Kubernetes services with LoadBalancer type in the YAML configuration.

  ---

  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/

• Question 63:

  Which two are required to enable Oracle Cloud Infrastructure (OCI) Container Engine for Kubernetes (OKE) cluster access from the kubect1 CLI?

  A. An SSH key pair with the public key added to cluster worker nodes
  B. Install and configure the OCI CLI
  C. OCI Identity and Access Management Auth Token
  D. Tiller enabled on the OKE cluster
  E. A configured OCI API signing key pair
  B. Install and configure the OCI CLI
  E. A configured OCI API signing key pair

  ---

  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 the Kubernetes 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

• Question 64:

  Which two are benefits of distributed systems?

  A. Privacy
  B. Security
  C. Ease of testing
  D. Scalability
  E. Resiliency
  D. Scalability
  E. Resiliency

  ---

  distributed systems of native-cloud like functions that have a lot of benefit like Resiliency and availability Resiliency and availability refers to the ability of a system to continue operating, despite the failure or sub-optimal performance of some of its components. In the case of Oracle Functions: The control plane is a set of components that manages function definitions. The data plane is a set of components that executes functions in response to invocation requests. For resiliency and high availability, both the control plane and data plane components are distributed across different availability domains and fault domains in a region. If one of the domains ceases to be available, the components in the remaining domains take over to ensure that function definition management and execution are not disrupted. When functions are invoked, they run in the subnets specified for the application to which the functions belong. For resiliency and high availability, best practice is to specify a regional subnet for an application (or alternatively, multiple AD-specific subnets in different availability domains). If an availability domain specified for an application ceases to be available, Oracle Functions runs functions in an alternative availability domain. Concurrency and Scalability Concurrency refers to the ability of a system to run multiple operations in parallel using shared resources. Scalability refers to the ability of the system to scale capacity (both up and down) to meet demand. In the case of Functions, when a function is invoked for the first time, the function's image is run as a container on an instance in a subnet associated with the application to which the function belongs. When the function is executing inside the container, the function can read from and write to other shared resources and services running in the same subnet (for example, Database as a Service). The function can also read from and write to other shared resources (for example, Object Storage), and other Oracle Cloud Services. If Oracle Functions receives multiple calls to a function that is currently executing inside a running container, Oracle Functions automatically and seamlessly scales horizontally to serve all the incoming requests. Oracle Functions starts multiple Docker containers, up to the limit specified for your tenancy. The default limit is 30 GB of RAM reserved for function execution per availability domain, although you can request an increase to this limit. Provided the limit is not exceeded, there is no difference in response time (latency) between functions executing on the different containers.

• Question 65:

  In the sample Kubernetes manifest file below, what annotations should you add to create a private load balancer In oracle Cloud infrastructure Container Engine for Kubermetes?

  

  A. service.beta.kubernetes.io/oci-load-balancer-private:"true"
  B. service.beta.kubernetes.io/oci-load-balancer-private: "true" service.beta.kubernetes.io/oci-load-balancer-subnet1: "ocid1.subnet.oc1..aaaaa....vdfw"
  C. service.beta.kubernetes.io/oci-load-balancer-internal: "true"
  D. service.beta.kubernetes.io/oci-load-balancer-internal: "true" service.beta.kubernetes.io/oci-load-balancer-subnet1: "ocid1.subnet.oc1..aaaaa....vdfw"
  D. service.beta.kubernetes.io/oci-load-balancer-internal: "true" service.beta.kubernetes.io/oci-load-balancer-subnet1: "ocid1.subnet.oc1..aaaaa....vdfw"

  ---

  https://docs.cloud.oracle.com/en-us/iaas/Content/ContEng/Tasks/contengcreatingloadbalancer.htm?TocPath=Services%7CExample%2 0Network%20Resource%20Configuration%7CUpgrading%20the%20Version%20of%20Kubernetes%2

  0Running%20on%20a%20Master%20Node%7C_____2

  Creating Internal Load Balancers in Public and Private Subnets You can create Oracle Cloud Infrastructure load balancers to control access to services running on a cluster:

  When you create a 'custom' cluster, you select an existing VCN that contains the network resources to be used by the new cluster. If you want to use load balancers to control traffic into the VCN, you select existing public or private subnets in

  that VCN to host the load balancers. When you create a 'quick cluster', the VCN that's automatically created contains a public regional subnet to host a load balancer. If you want to host load balancers in private subnets, you can add private

  subnets to the VCN later.

  Alternatively, you can create an internal load balancer service in a cluster to enable other programs running in the same VCN as the cluster to access services in the cluster. You can host internal load balancers in public subnets and private

  subnets.

  To create an internal load balancer hosted on a public subnet, add the following annotation in the metadata section of the manifest file:

  service.beta.kubernetes.io/oci-load-balancer-internal: "true"

  To create an internal load balancer hosted on a private subnet, add both following annotations in the metadata section of the manifest file:

  service.beta.kubernetes.io/oci-load-balancer-internal: "true" service.beta.kubernetes.io/oci-load-balancer-subnet1: "ocid1.subnet.oc1..aaaaaa....vdfw" where ocid1.subnet.oc1..aaaaaa....vdfw is the OCID of the private subnet.

• Question 66:

  Which one of the statements describes a service aggregator pattern?

  A. It is implemented in each service separately and uses a streaming service
  B. It involves implementing a separate service that makes multiple calls to other backend services
  C. It uses a queue on both sides of the service communication
  D. It involves sending events through a message broker
  B. It involves implementing a separate service that makes multiple calls to other backend services

  ---

  this pattern isolates an operation that makes calls to multiple back-end microservices, centralizing its logic into a specialized microservice.

• Question 67:

  In order to effectively test your cloud-native applications, you might utilize separate environments (development, testing, staging, production, etc.). Which Oracle Cloud Infrastructure (OC1) service can you use to create and manage your infrastructure?

  A. OCI Compute
  B. OCI Container Engine for Kubernetes
  C. OCI Resource Manager
  D. OCI API Gateway
  C. OCI Resource Manager

  ---

  Resource Manager is an Oracle Cloud Infrastructure service that allows you to automate the process of provisioning your Oracle Cloud Infrastructure resources. Using Terraform, Resource Manager helps you install, configure, and manage resources through the "infrastructure-as-code" model.

• Question 68:

  A developer using Oracle Cloud Infrastructure (OCI) API Gateway must authenticate the API requests to their web application. The authentication process must be implemented using a custom scheme which accepts string parameters from the API caller. Which method can the developer use In this scenario?

  A. Create an authorizer function using request header authorization.
  B. Create an authorizer function using token-based authorization.
  C. Create a cross account functions authorizer.
  D. Create an authorizer function using OCI Identity and Access Management based authentication
  B. Create an authorizer function using token-based authorization.

  ---

  Having deployed the authorizer function, you enable authentication and authorization for an API deployment by including two different kinds of request policy in the API deployment specification:

  An authentication request policy for the entire API deployment that specifies:The OCID of the authorizer function that you deployed to Oracle Functions that will perform authentication and authorization.The request attributes to pass to the

  authorizer function.Whether unauthenticated callers can access routes in the API deployment.

  An authorization request policy for each route that specifies the operations a caller is allowed to perform, based on the caller's access scopes as returned by the authorizer function. Using the Console to Add Authentication and Authorization

  Request Policies To add authentication and authorization request policies to an API deployment specification using the Console:

  Create or update an API deployment using the Console, select the From Scratch option, and enter details on the Basic Information page. For more information, see Deploying an API on an API Gateway by Creating an API Deployment and

  Updating API Gateways and API Deployments. In the API Request Policies section of the Basic Information page, click the Add button beside Authentication and specify:

  Application in : The name of the application in Oracle Functions that contains the authorizer function. You can select an application from a different compartment. Function Name: The name of the authorizer function in

  Oracle Functions. Authentication Token: Whether the access token is contained in a request header or a query parameter.

  Authentication Token Value: Depending on whether the access token is contained in a request header or a query parameter, specify:

  Header Name: If the access token is contained in a request header, enter the name of the header. Parameter Name: If the access token is contained in a query parameter, enter the name of the query parameter.

  https://docs.cloud.oracle.com/en-us/iaas/Content/APIGateway/Tasks/apigatewayaddingauthzauthn.htm

• Question 69:

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

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

  ---

  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 to create, 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

• Question 70:

  Which statements is incorrect with regards to the Oracle Cloud Infrastructure (OCI) Notifications service?

  A. Notification topics may be assigned as the action performed by an OCI Events configuration.
  B. OCI Alarms can be configured to publish to a notification topic when triggered.
  C. An OCI function may subscribe to a notification topic.
  D. A subscription can forward notifications to an HTTPS endpoint.
  E. A subscription can integrate with PagerDuty events.
  F. It may be used to receive an email each time an OCI Autonomous Database backup is completed.
  F. It may be used to receive an email each time an OCI Autonomous Database backup is completed.