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Oracle Cloud Infrastructure 2022 Developer Professional Sample Questions (Q30-Q35):
NEW QUESTION # 30
What is the open source engine for Oracle Functions?
- A. Knative
- B. OpenFaaS
- C. Apache OpenWhisk
- D. Fn Project
Answer: D
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.
NEW QUESTION # 31
You are developing a serverless application with Oracle Functions. Your function needs to store state in a database. Your corporate security Standards mandate encryption of secret information like database passwords.
As a function developer, which approach should you follow to satisfy this security requirement?
- A. All function configuration variables are automatically encrypted by Oracle Functions.
- B. Encrypt the password using Oracle Cloud Infrastructure Key Management. Decrypt this password in your function code with the generated key.
- C. Use the Oracle Cloud Infrastructure Console and enter the password in the function configuration section in the provided input field.
- D. Use Oracle Cloud Infrastructure Key Management to auto-encrypt the password. It will inject the auto-decrypted password inside your function container.
Answer: B
Explanation:
Oracle Functions: Using Key Management To Encrypt And Decrypt Configuration Variables Since this process involves multiple steps, I thought it would be helpful to give you an outline of the steps that we're going to take:
Create a KMS vault
Create a Master Encryption Key
Generate a Data Encryption Key (DEK) from the Master Encryption Key
Use the DEK plaintext return value to encrypt the sensitive value (offline) Store the encrypted sensitive value as a config variable in the serverless application Store the DEK ciphertext and the initVector used to encrypt the sensitive value as Function config variables Within the function, decrypt the DEK ciphertext back into plaintext using the OCID and Cryptographic Endpoint by invoking the OCI KMS SDK Decrypt the sensitive value using the decrypted DEK plaintext and the initVector
References:
https://blogs.oracle.com/developers/oracle-functions-using-key-management-to-encrypt-and-decrypt-configuration-variables
https://docs.oracle.com/en/database/other-databases/essbase/19.3/essad/encrypt-values-using-kms.html
NEW QUESTION # 32
You have two microservices, A and B running in production. Service A relies on APIs from service B.
You want to test changes to service A without deploying all of its dependencies, which includes service B.
Which approach should you take to test service A?
- A. Test using API mocks.
- B. Test against production APIs.
- C. There is no need to explicitly test APIs.
- D. Test the APIs in private environments.
Answer: A
Explanation:
Best Practices: API Mocking:
This is where mocking comes in: instead of developing code with actual external dependencies in place, a mock of those dependencies is created and used instead. Depending on your development needs this mock is made "intelligent" enough to allow you to make the calls you need and get similar results back as you would from the actual component, thus enabling development to move forward without being hindered by eventual unavailability of external systems you depend on The most common term for creating simulated components is mocking, but others are also used, and partly apply to different things; stubbing, simulation, and virtualization. The basic concept is the same - instead of using an actual software component (an API in our case) - a "replacement" version of that API is created and used instead. It behaves as the original API, but lacks many of the functional and non-functional characteristics of the original component. Which term is applicable depends on the degree to which the mock-up corresponds to the actual API:
Stubbing: mostly a placeholder without real functionality
Mocking: basic functionality required for a specific testing or development purpose Simulation: complete functionality for testing or development purposes Virtualization: imulation that is deployed into an operational, manageable and controllable environment
References:
https://docs.oracle.com/en/solutions/build-governance-app-oracle-paas/test-custom-apis.html
https://www.soapui.org/learn/mocking/what-is-api-mocking/
NEW QUESTION # 33
You are developing a serverless application with Oracle Functions. You have created a function in compartment named prod. When you try to invoke your function you get the following error.
Error invoking function. status: 502 message: dhcp options ocid1.dhcpoptions.oc1.phx.aaaaaaaac... does not exist or Oracle Functions is not authorized to use it How can you resolve this error?
- A. Deleting the function and redeploying it will fix the problem
- B. Create a policy:
Allow service FaaS to use virtual-network-family in compartment prod - C. Create a policy:
Allow function-family to use virtual-network-family in compartment prod - D. Create a policy:
Allow any-user to manage function-family and virtual-network-family in compartment prod
Answer: B
Explanation:
Troubleshooting Oracle Functions:
There are common issues related to Oracle Functions and how you can address them.
Invoking a function returns a FunctionInvokeSubnetNotAvailable message and a 502 error (due to a DHCP Options issue) When you invoke a function that you've deployed to Oracle Functions, you might see the following error message:
{"code":"FunctionInvokeSubnetNotAvailable","message":"dhcp options ocid1.dhcpoptions........ does not exist or Oracle Functions is not authorized to use it"} Fn: Error invoking function. status: 502 message: dhcp options ocid1.dhcpoptions........ does not exist or Oracle Functions is not authorized to use it If you see this error:
Double-check that a policy has been created to give Oracle Functions access to network resources.
Create Policies to Control Access to Network and Function-Related Resources:
Service Access to Network Resources
When Oracle Functions users create a function or application, they have to specify a VCN and a subnet in which to create them. To enable the Oracle Functions service to create the function or application in the specified VCN and subnet, you must create an identity policy to grant the Oracle Functions service access to the compartment to which the network resources belong.
To create a policy to give the Oracle Functions service access to network resources:
Log in to the Console as a tenancy administrator.
Create a new policy in the root compartment:
Open the navigation menu. Under Governance and Administration, go to Identity and click Policies.
Follow the instructions in To create a policy, and give the policy a name (for example, functions-service-network-access).
Specify a policy statement to give the Oracle Functions service access to the network resources in the compartment:
Allow service FaaS to use virtual-network-family in compartment <compartment-name> For example:
Allow service FaaS to use virtual-network-family in compartment acme-network Click Create.
Double-check that the set of DHCP Options in the VCN specified for the application still exists.
References:
https://docs.cloud.oracle.com/en-us/iaas/Content/Functions/Tasks/functionstroubleshooting.htm
https://docs.cloud.oracle.com/en-us/iaas/Content/Functions/Tasks/functionscreatingpolicies.htm
NEW QUESTION # 34
Which Oracle Cloud Infrastructure (OCI) load balancer shape is used by default in OCI container Engineer for Kubernetes?
- A. There is no default. The shape has to be specified.
- B. 100 Mbps
- C. 8000 Mbps
- D. 400 Mbps
Answer: B
Explanation:
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.
SHAPE
A template that determines the load balancer's total pre-provisioned maximum capacity (bandwidth) for ingress plus egress traffic. Available shapes include 10Mbps, 100 Mbps, 400 Mbps, and 8000 Mbps.
References:
https://docs.cloud.oracle.com/en-us/iaas/Content/ContEng/Tasks/contengcreatingloadbalancer.htm
https://docs.cloud.oracle.com/en-us/iaas/Content/Balance/Concepts/balanceoverview.htm
NEW QUESTION # 35
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