Correct Answer: A

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

Correct Answer: A

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

Correct Answer: C

Oracle Cloud Infrastructure provides a number of DevOps tools and plug-ins for working with Oracle Cloud Infrastructure services. These can simplify provisioning and managing infrastructure or enable automated testing and continuous delivery. A/B Testing While A/B testing can be combined with either canary or blue-green deployments, it is a very different thing. A/B testing really targets testing the usage behavior of a service or feature and is typically used to validate a hypothesis or to measure two versions of a service or feature and how they stack up against each other in terms of performance, discoverability and usability. A/B testing often leverages feature flags (feature toggles), which allow you to dynamically turn features on and off. Integration Testing Integration tests are also known as end-to-end (e2e) tests. These are long-running tests that exercise the system in the way it is intended to be used in production. These are the most valuable tests in demonstrating reliability and thus increasing confidence. Penetration Testing Oracle regularly performs penetration and vulnerability testing and security assessments against the Oracle cloud infrastructure, platforms, and applications. These tests are intended to validate and improve the overall security of Oracle Cloud Services.

Correct Answer: C

Having created an API gateway and deployed one or more APIs on it, you'll typically want to limit the rate at which front-end clients can make requests to back-end services. For example, to:

-maintain high availability and fair use of resources by protecting back ends from being overwhelmed by too many requests

-prevent denial-of-service attacks

-constrain costs of resource consumption

- restrict usage of APIs by your customers' users in order to monetize APIs You apply a rate limit globally to all routes in an API deployment specification. If a request is denied because the rate limit has been exceeded, the response header

specifies when the request can be retried.

You can add a rate-limiting request policy to an API deployment specification by:

using the Console editing a JSON file

Correct Answer: D

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.

Correct Answer: B

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. 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've deployed 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. Below are the oracle services that can trigger Oracle functions -Events Service -Notification Service -API Gateway Service -Oracle Integration service(using OCI Signature Version 1 security policy) so OCI Registry services cannot trigger your functions directly

Correct Answer: D

In the API Gateway service, there are two types of policy:

-

a request policy describes actions to be performed on an incoming request from a caller before it is sent to a back end

-

a response policy describes actions to be performed on a response returned from a back end before it is sent to a caller

You can use request policies to:

-limit the number of requests sent to back-end services

-enable CORS (Cross-Origin Resource Sharing) support

-provide authentication and authorization

Correct Answer: AB

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 a list 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 another Oracle 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

Correct Answer: D

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. With Resource Manager, you can use Terraform's remote exec functionality to execute scripts or commands on a remote computer. You can also use this technique for other provisioners that require access to the remote resource.

Correct Answer: A

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