Oracle 1Z0-1084-21 Online Practice Questions and Exam Preparation

Oracle 1Z0-1084-21 Online Questions & Answers

• Question 51:

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

  

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

  ---

  The shape of an Oracle Cloud Infrastructure load balancer specifies its maximum total bandwidth (that is, ingress plus egress). By default, load balancers are created with a shape of 100Mbps. Other shapes are available, including 400Mbps

  and 8000Mbps.

  To specify an alternative shape for a load balancer, add the following annotation in the metadata section of the manifest file:

  service.beta.kubernetes.io/oci-load-balancer-shape: where value is the bandwidth of the shape (for example, 100Mbps, 400Mbps, 8000Mbps).

  For example:

  apiVersion: v1

  kind: Service

  metadata:

  name: my-nginx-svc

  labels:

  app: nginx

  annotations:

  service.beta.kubernetes.io/oci-load-balancer-shape: 400Mbps spec:

  type: LoadBalancer

  ports:

  -port: 80 selector: app: nginx https://github.com/oracle/oci-cloud-controller-manager/blob/master/docs/load-balancer-annotations.md

• Question 52:

  You are tasked with developing an application that requires the use of Oracle Cloud Infrastructure (OCI) APIs to POST messages to a stream in the OCI Streaming service. Which statement is incorrect?

  A. The request must include an authorization signing string including (but not limited to) x-content- sha256, content-type, and content-length headers.
  B. The Content-Type header must be Set to application/j son
  C. An HTTP 401 will be returned if the client's clock is skewed more than 5 minutes from the server's.
  D. The request does not require an Authorization header.
  A. The request must include an authorization signing string including (but not limited to) x-content- sha256, content-type, and content-length headers.

  ---

  Emits messages to a stream. There's no limit to the number of messages in a request, but the total size of a message or request must be 1 MiB or less. The service calculates the partition ID from the message key and stores messages that share a key on the same partition. If a message does not contain a key or if the key is null, the service generates a message key for you. The partition ID cannot be passed as a parameter. POST /20180418/streams//messages Host: streaming-api.us-phoenix-1.oraclecloud.com { "messages": { { "key": null, "value": "VGhlIHF1aWNrIGJyb3duIGZveCBqdW1wZWQgb3ZlciB0aGUgbGF6eSBkb2cu" }, { "key": null, "value": "UGFjayBteSBib3ggd2l0aCBmaXZlIGRvemVuIGxpcXVvciBqdWdzLg==" } } } https://docs.cloud.oracle.com/en-us/iaas/api/#/en/streaming/20180418/Message/PutMessages

• Question 53:

  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 54:

  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

  ---

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

• Question 55:

  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

  ---

  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.

• Question 56:

  Which Oracle Cloud Infrastructure (OCI) load balancer shape is used by default in OCI container Engineer for Kubernetes?

  A. 400 Mbps
  B. 8000 Mbps
  C. There is no default. The shape has to be specified.
  D. 100 Mbps
  D. 100 Mbps

  ---

  Specifying Alternative Load Balancer Shapes The shape of an Oracle Cloud Infrastructure load balancer specifies its maximum total bandwidth (that is, ingress plus egress). By default, load balancers are created with a shape of 100Mbps. Other shapes are available, including 400Mbps and 8000Mbps. https://docs.cloud.oracle.com/en-us/iaas/Content/ContEng/Tasks/contengcreatingloadbalancer.htm

• Question 57:

  What are two of the main reasons you would choose to implement a serverless architecture?

  A. No need for integration testing
  B. Reduced operational cost
  C. Improved In-function state management
  D. Automatic horizontal scaling
  E. Easier to run long-running operations
  B. Reduced operational cost
  D. Automatic horizontal scaling

• Question 58:

  Which header is NOT required when signing GET requests to Oracle Cloud Infrastructure APIs?

  A. date or x-date
  B. (request-target)
  C. content-type
  D. host
  C. content-type

  ---

  For GET and DELETE requests (when there's no content in the request body), the signing string must include at least these headers: (request-target) (as described in draft-cavage-http-signatures-08) host date or x-date (if both are included, Oracle uses x-date)

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

• Question 59:

  Per CAP theorem, in which scenario do you NOT need to make any trade-off between the guarantees?

  A. when there are no network partitions
  B. when the system is running in the cloud
  C. when the system is running on-premise
  D. when you are using load balancers
  A. when there are no network partitions

  ---

  CAP THEOREM

  "CONSISTENCY, AVAILABILITY and PARTITION TOLERANCE are the features that we want in our distributed system together"

  Of three properties of shared-data systems (Consistency, Availability and tolerance to network Partitions) only two can be achieved at any given moment in time.

• Question 60:

  How do you perform a rolling update in Kubernetes?

  A. kubect1 rolling-update
  B. kubect1 upgrade --image=*image:v2
  C. kubect1 update -c
  D. kubect1 rolling-update --image=image
  A. kubect1 rolling-update

  ---

  https://docs.oracle.com/en/cloud/iaas/wercker-cloud/wercm/quickstarts/platforms/kubernetes/