Correct Answer: A

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.

Correct Answer: A

https://blogs.oracle.com/cloud-infrastructure/introducing-service-broker-for-kubernetes OCI Service Broker for Kubernetes is an implementation of the Open Service Broker API. OCI Service Broker for Kubernetes is specifically for interacting with Oracle Cloud Infrastructure services from Kubernetes clusters. It includes three service broker adapters to bind to the following Oracle Cloud Infrastructure services: Object Storage Autonomous Transaction Processing Autonomous Data Warehouse

Correct Answer: B

kubectl explain to List the fields for supported resources

https://kubernetes.io/docs/reference/generated/kubectl/kubectl-commands#explain

Correct Answer: D

Oracle Cloud Infrastructure Web Application Firewall (WAF) is a cloud-based, Payment Card Industry (PCI) compliant, global security service that protects applications from malicious and unwanted internet traffic. WAF can protect any internet facing endpoint, providing consistent rule enforcement across a customer's applications. WAF provides you with the ability to create and manage rules for internet threats including Cross- Site Scripting (XSS), SQL Injection and other OWASP-defined vulnerabilities. Unwanted bots can be mitigated while tactically allowed desirable bots to enter. Access rules can limit based on geography or the signature of the request.

Correct Answer: C

Pulling Images from Registry during Deployment During the deployment of an application to a Kubernetes cluster, you'll typically want one or more images to be pulled from a Docker registry. In the application's manifest file you specify the images to pull, the registry to pull them from, and the credentials to use when pulling the images. The manifest file is commonly also referred to as a pod spec, or as a deployment.yaml file (although other filenames are allowed). If you want the application to pull images that reside in Oracle Cloud Infrastructure Registry, you have to perform two steps:

-

You have to use kubectl to create a Docker registry secret. The secret contains the Oracle Cloud Infrastructure credentials to use when pulling the image. When creating secrets, Oracle strongly

recommends you use the latest version of kubectl To create a Docker registry secret: 1- If you haven't already done so, follow the steps to set up the cluster's kubeconfig configuration file and (if necessary) set the KUBECONFIG environment variable to point to the file. Note that you must set up your own kubeconfig file. You cannot access a cluster using a kubeconfig file that a different user set up. 2- In a terminal window, enter: $ kubectl create secret docker-registry --docker-server=.ocir.io --dockerusername='/' --docker-password='' --dockeremail='' where: is a name of your choice, that you will use in the manifest file to refer to the secret . For example, ocirsecret is the key for the Oracle Cloud Infrastructure Registry region you're using. For example, iad. See Availability by Region. ocir.io is the Oracle Cloud Infrastructure Registry name. is the auto-generated Object Storage namespace string of the tenancy containing the repository from which the application is to pull the image (as shown on the Tenancy Information page). For example, the namespace of the acme-dev tenancy might be ansh81vru1zp. Note that for some older tenancies, the namespace string might be the same as the tenancy name in all lower-case letters (for example, acmedev). is the username to use when pulling the image. The username must have access to the tenancy specified by . For example, jdoe@acme.com . If your tenancy is federated with Oracle Identity Cloud Service, use the format oracleidentitycloudservice/ is the auth token of the user specified by . For example, k]j64r{1sJSSF-;)K8 is an email address. An email address is required, but it doesn't matter what you specify. For example, jdoe@acme.com

-

You have to specify the image to pull from Oracle Cloud Infrastructure Registry, including the repository location and the Docker registry secret to use, in the application's manifest file.

Correct Answer: D

Deleting an Image When you no longer need an old image or you simply want to clean up the list of image tags in a repository, you can delete images from Oracle Cloud Infrastructure Registry. Your permissions control the images in Oracle Cloud Infrastructure Registry that you can delete. You can delete images from repositories you've created, and from repositories that the groups to which you belong have been granted access by identity policies. If you belong to the Administrators group, you can delete images from any repository in the tenancy. Note that as well deleting individual images , you can set up image retention policies to delete images automatically based on selection criteria you specify (see Retaining and Deleting Images Using Retention Policies). Note: In each region in a tenancy, there's a global image retention policy. The global image retention policy's default selection criteria retain all images so that no images are automatically deleted.

However, you can change the global image retention policy so that images are deleted if they meet the criteria you specify. A region's global image retention policy applies to all repositories in the region, unless it is explicitly overridden by one or more custom image retention policies. You can set up custom image retention policies to override the global image retention policy with different criteria for specific repositories in a region. Having created a custom image retention policy, you apply the custom retention policy to a repository by adding the repository to the policy. The global image retention policy no longer applies to repositories that you add to a custom retention policy.

Correct Answer: BE

https://www.techjini.com/blog/microservices/

Correct Answer: B

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.

Correct Answer: AD

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/enus/iaas/Content/Database/Tasks/adbtools.htm

Correct Answer: C

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/gettingstarted-with-microservices-part-three