oracle 1z0-1084-21 practice test
Oracle Cloud Infrastructure Developer 2021 Associate Exam
Question 1
What is the communication method between different Cloud native applications services?
- A. Complex and asynchronous
- B. Basic and synchronous
- C. Complex and synchronous
- D. Basic and asynchronous
Answer:
D
Explanation:
What Is Cloud Native?
Cloud native technologies are characterized by the use of containers, microservices, serverless
functions, development pipelines, infrastructure expressed as code, event-driven applications, and
Application Programming Interfaces (APIs). Cloud native enables faster software development and
the ability to build applications that are resilient, manageable, observable, and dynamically scalable
to global enterprise levels.
When constructing a cloud-native application, you'll want to be sensitive to how back-end services
communicate with each other. Ideally, the less inter-service communication, the better. However,
avoidance isn't always possible as back-end services often rely on one another to complete an
operation.
While direct HTTP calls between microservices are relatively simple to implement, care should be
taken to minimize this practice. To start, these calls are alwayssynchronousand will block the
operation until a result is returned or the request times outs. What were once self-contained,
independent services, able to evolve independently and deploy frequently, now become coupled to
each other. As coupling among microservices increase, their architectural benefits diminish.
Executing an infrequent request that makes a single direct HTTP call to another microservice might
be acceptable for some systems. However, high-volume calls that invoke direct HTTP calls to multiple
microservices aren't advisable. They can increase latency and negatively impact the performance,
scalability, and availability of your system. Even worse, along series of direct HTTP communication
can lead to deep and complex chains of synchronous microservices calls,shown in Figure 4-9:
A message queue is an intermediary construct through which a producer and consumer pass a
message. Queuesimplement an asynchronous, point-to-point messaging pattern.
Events
Message queuingis an effective way to implement communication where a producer
canasynchronouslysend a consumer a message.
Reference:
https://www.xenonstack.com/blog/cloud-native-architecture/
https://www.oracle.com/sa/cloud/cloud-native/
https://www.oracle.com/technetwork/topics/entarch/cloud-native-app-development-wp-
3664668.pdf
Question 2
In a Linux environment, what is the default location of the configuration file that Oracle Cloud
Infrastructure CLI uses for profile information? (Choose the best answer.)
- A. $HOME/.oci/con
- B. /usr/local/bin/con
- C. /usr/bin/oci/con
- D. /etc/.oci/con
Answer:
A
Explanation:
Before using Oracle Functions, you must have an Oracle Cloud Infrastructure CLI configuration file
that contains the credentials of the user account that you will be using to create and deploy
functions. These user account credentials are referred to as a 'profile'.
By default, the Oracle Cloud Infrastructure CLI configuration file is located at~/.oci/config. You might
already have a configuration file as a result of installing the Oracle Cloud Infrastructure CLI. However,
you don't need to have installed the Oracle Cloud Infrastructure CLI in order to use Oracle Functions.
Reference:
https://docs.cloud.oracle.com/en-
us/iaas/Content/Functions/Tasks/functionsconfigureocicli.htm#:~:text=By%20default%2C%20the%2
0Oracle%20Cloud,file%20is%20located%20at%20~%2F.
https://docs.cloud.oracle.com/en-us/iaas/Content/API/SDKDocs/cliconfigure.htm
Question 3
Which pattern can help you minimize the probability of cascading failures in your system during
partial loss of connectivity or a complete service failure?
- A. Retry pattern
- B. Anti-corruption layer pattern
- C. Circuit breaker pattern
- D. Compensating transaction pattern
Answer:
C
Explanation:
Acascading 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
alsoprevent 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/getting-started-with-microservices-part-three
Question 4
Which two statements accurately describe Oracle SQL Developer Web on Oracle Cloud Infrastructure
(OCI) Autonomous Database?
- A. It is available for databases with dedicated Exadata infrastructure only.
- B. After provisioning into an OCI compute Instance, it can automatically connect to the OCI Autonomous Databases instances.
- C. It is available for databases with both dedicated and shared Exadata infrastructure.
- D. It provides a development environment and a data modeler interface for OCI Autonomous Databases.
- E. It must be enabled via OCI Identity and Access Management policy to get access to the Autonomous Databases instances.
Answer:
AD
Explanation:
Oracle SQLDeveloper Web
Oracle SQL Developer Web in Autonomous Data Warehouse provides a development environment
and a data modeler interface forAutonomous Databases. SQLDeveloper Web is available for
databases with both
dedicated Exadata infrastructure
and
shared Exadata infrastructure
.
https://docs.cloud.oracle.com/en-us/iaas/Content/Database/Tasks/adbtools.htm
Question 5
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
Answer:
E
Explanation:
https://docs.cloud.oracle.com/en-us/iaas/Content/API/Concepts/sdks.htm
Question 6
Given a service deployed on Oracle Cloud Infrastructure Container Engine far Kubernetes (OKE),
which annotation should you add in the sample manifest file below to specify a 400 Mbps load
balancer?
- A. service.beta.kubernetes.io/oci-load-balancer-value: 400Mbps
- B. service.beta.kubernetes.io/oci-load-balancer-size: 400Mbps
- C. service.beta.kubernetes.io/oci-load-balancer-shape: 400Mbps
- D. service, beta, kubernetes . io/oci-load—balancer-kind: 400Mbps
Answer:
C
Explanation:
Overview of Load Balancing:
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.
oci-load-balancer-shape:A template that determines the load balancer's total pre-provisioned
maximum capacity (bandwidth) for ingress plus egress traffic. Available shapes include 100Mbps,
400Mbps, and 8000Mbps. Cannot be modified after load balancer creation.
All annotations are prefixed withservice.beta.kubernetes.io/. For example:
kind: Service
apiVersion: v1
metadata:
name: nginx-service
annotations:
service.beta.kubernetes.io/oci-load-balancer-shape: "400Mbps"
service.beta.kubernetes.io/oci-load-balancer-subnet1: "ocid..."
service.beta.kubernetes.io/oci-load-balancer-subnet2: "ocid..."
spec:
...
Reference:
https://docs.cloud.oracle.com/en-us/iaas/Content/Balance/Concepts/balanceoverview.htm
https://github.com/oracle/oci-cloud-controller-manager/blob/master/docs/load-balancer-
annotations.md
Question 7
What is the minimum amount of storage that a persistent volume claim can obtain In Oracle Cloud
Infrastructure Container Engine for Kubemetes (OKE)?
- A. 1 TB
- B. 10 GB
- C. 1 GB
- D. 50 GB
Answer:
D
Explanation:
Provisioning Persistent Volume Claims on the Block Volume Service:
Block volume quota: If you intend to create Kubernetes persistent volumes, sufficient block volume
quota must be available in each availability domain to meet the persistent volume claim. Persistent
volume claims must request aminimum of 50 gigabytes.
Reference:
https://docs.cloud.oracle.com/en-
us/iaas/Content/ContEng/Tasks/contengcreatingpersistentvolumeclaim.htm
https://docs.cloud.oracle.com/en-us/iaas/Content/ContEng/Concepts/contengprerequisites.htm
Question 8
What is the difference between blue/green and canary deployment strategies?
- A. In blue/green, application Is deployed In minor increments to a select group of people. In canary, both old and new applications are simultaneously in production.
- B. In blue/green, both old and new applications are in production at the same time. In canary, application is deployed Incrementally to a select group of people.
- C. In blue/green, current applications are slowly replaced with new ones. In < MW y, Application ll deployed incrementally to a select group of people.
- D. In blue/green, current applications are slowly replaced with new ones. In canary, both old and new applications are In production at the same time.
Answer:
B
Explanation:
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.
https://docs.cloudfoundry.org/devguide/deploy-apps/blue-green.html
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. ... Canaries were once regularly used in coal mining as an early warning system.
https://octopus.com/docs/deployment-patterns/canary-deployments
Question 9
What is the open source engine for Oracle Functions?
- A. Apache OpenWhisk
- B. OpenFaaS
- C. Fn Project
- D. Knative
Answer:
C
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 theFn
Projectopen source engine. Use Oracle Functions (sometimes abbreviated to just Functions) when
you want to focus on writing code to meet business needs.
Question 10
Which one of the following is NOT a valid backend-type supported by Oracle Cloud Infrastructure
(OCI) API Gateway?
- A. STOCK_RESPONSE_BACKEND
- B. ORACLE_FUNCTIONS_BACKEND
- C. ORACLE_STREAMS_BACKEND
- D. HTTP_BACKEND
Answer:
C
Explanation:
In the API Gateway service, a back end is the means by which a gateway routes requests to the back-
end services that implement APIs. If you add a private endpoint back end to an API gateway, you give
the API gateway access to the VCN associated with that private endpoint.
You can also grant an API gateway access to other Oracle Cloud Infrastructure services as back ends.
For example, you could grant an API gateway access to Oracle Functions, so you can create and
deploy an API that is backed by a serverless function.
API Gateway service to create an API gateway, you can create an API deployment to access HTTP and
HTTPS URLs.
https://docs.cloud.oracle.com/en-
us/iaas/Content/APIGateway/Tasks/apigatewayusinghttpbackend.htm
API Gateway service to create an API gateway, you can create an API deployment that invokes
serverless functions defined in Oracle Functions.
https://docs.cloud.oracle.com/en-
us/iaas/Content/APIGateway/Tasks/apigatewayusingfunctionsbackend.htm
API Gateway service, you can define a path to a stock response back end
https://docs.cloud.oracle.com/en-
us/iaas/Content/APIGateway/Tasks/apigatewayaddingstockresponses.htm