ARC-730 시험 - Salesforce실제시험문제와 답 - 95문항

Question No : 1

Refer to the exhibit.

An organization uses one specific CloudHub (AWS) region for all CloudHub deployments.
How are CloudHub workers assigned to availability zones (AZs) when the organization's Mule applications are deployed to CloudHub in that region?

A.Workers belonging to a given environment are assigned to the same AZ within that region
B.AZs are selected as part of the Mule application's deployment configuration
C.Workers are randomly distributed across available AZs within that region
D.An AZ is randomly selected for a Mule application, and all the Mule application's CloudHub workers are assigned to that one AZ

정답:
Explanation:
Correct Answer Workers are randomly distributed across available AZs within that region.
>> Currently, we only have control to choose which AWS Region to choose but there is no control at all using any configurations or deployment options to decide what Availability Zone (AZ) to assign to what worker.
>> There are NO fixed or implicit rules on platform too w.r.t assignment of AZ to workers based on environment or application.
>> They are completely assigned in random. However, cloudhub definitely ensures that HA is achieved by assigning the workers to more than on AZ so that all workers are not assigned to same AZ for same application.
Reference: https://help.mulesoft.com/s/question/0D52T000051rqDj/one-cloudhub-aws-region-how-cloudhub-workers-are-assigned-to-availability-zones-azs-

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Question No : 2

When could the API data model of a System API reasonably mimic the data model exposed by the corresponding backend system, with minimal improvements over the backend system's data model?

A.When there is an existing Enterprise Data Model widely used across the organization
B.When the System API can be assigned to a bounded context with a corresponding data model
C.When a pragmatic approach with only limited isolation from the backend system is deemed appropriate
D.When the corresponding backend system is expected to be replaced in the near future

정답:
Explanation:
Correct Answer When a pragmatic approach with only limited isolation from the backend system is deemed appropriate.
General guidance w.r.t choosing Data Models:
>> If an Enterprise Data Model is in use then the API data model of System APIs should make use of data types from that Enterprise Data Model and the corresponding API implementation should translate between these data types from the Enterprise Data Model and the native data model of the backend system.
>> If no Enterprise Data Model is in use then each System API should be assigned to a Bounded Context, the API data model of System APIs should make use of data types from the corresponding Bounded Context Data Model and the corresponding API implementation should translate between these data types from the Bounded Context Data Model and the native data model of the backend system. In this scenario, the data types in the Bounded Context Data Model are defined purely in terms of their business characteristics and are typically not related to the native data model of the backend system. In other words, the translation effort may be significant.
>> If no Enterprise Data Model is in use, and the definition of a clean Bounded Context Data Model is considered too much effort, then the API data model of System APIs should make use of data types that approximately mirror those from the backend system, same semantics and naming as backend system, lightly sanitized, expose all fields needed for the given System API’s functionality, but not significantly more and making good use of REST conventions.
The latter approach, i.e., exposing in System APIs an API data model that basically mirrors that of the backend system, does not provide satisfactory isolation from backend systems through the System API tier on its own. In particular, it will typically not be possible to "swap out" a backend system without significantly changing all System APIs in front of that backend system and therefore the API implementations of all Process APIs that depend on those System APIs! This is so because it is not desirable to prolong the life of a previous backend system’s data model in the form of the API data model of System APIs that now front a new backend system. The API data models of System APIs following this approach must therefore change when the backend system is replaced.
On the other hand:
>> It is a very pragmatic approach that adds comparatively little overhead over accessing the backend system directly
>> Isolates API clients from intricacies of the backend system outside the data model (protocol, authentication, connection pooling, network address, …)
>> Allows the usual API policies to be applied to System APIs
>> Makes the API data model for interacting with the backend system explicit and visible, by exposing it in the RAML definitions of the System APIs
>> Further isolation from the backend system data model does occur in the API implementations of the Process API tier

Question No : 3

Mule applications that implement a number of REST APIs are deployed to their own subnet that is inaccessible from outside the organization.
External business-partners need to access these APIs, which are only allowed to be invoked from a separate subnet dedicated to partners - called Partner-subnet. This subnet is accessible from the public internet, which allows these external partners to reach it.
Anypoint Platform and Mule runtimes are already deployed in Partner-subnet. These Mule runtimes can already access the APIs.
What is the most resource-efficient solution to comply with these requirements, while having the least impact on other applications that are currently using the APIs?

A.Implement (or generate) an API proxy Mule application for each of the APIs, then deploy the API proxies to the Mule runtimes
B.Redeploy the API implementations to the same servers running the Mule runtimes
C.Add an additional endpoint to each API for partner-enablement consumption
D.Duplicate the APIs as Mule applications, then deploy them to the Mule runtimes

정답:

Question No : 4

An API has been updated in Anypoint Exchange by its API producer from version 3.1.1 to 3.2.0 following accepted semantic versioning practices and the changes have been communicated via the API's public portal.
The API endpoint does NOT change in the new version.
How should the developer of an API client respond to this change?

A.The update should be identified as a project risk and full regression testing of the functionality that uses this API should be run
B.The API producer should be contacted to understand the change to existing functionality
C.The API producer should be requested to run the old version in parallel with the new one
D.The API client code ONLY needs to be changed if it needs to take advantage of new features

정답:
Explanation:
Reference: https://docs.mulesoft.com/exchange/to-change-raml-version

Question No : 5

What is true about API implementations when dealing with legal regulations that require all data processing to be performed within a certain jurisdiction (such as in the USA or the EU)?

A.They must avoid using the Object Store as it depends on services deployed ONLY to the US East region
B.They must use a Jurisdiction-local external messaging system such as Active MQ rather than Anypoint MQ
C.They must te deployed to Anypoint Platform runtime planes that are managed by Anypoint Platform control planes, with both planes in the same Jurisdiction
D.They must ensure ALL data is encrypted both in transit and at rest

정답:
Explanation:
Correct Answer They must be deployed to Anypoint Platform runtime planes that are managed by Anypoint Platform control planes, with both planes in the same Jurisdiction. >> As per legal regulations, all data processing to be performed within a certain jurisdiction. Meaning, the data in USA should reside within USA and should not go out. Same way, the data in EU should reside within EU and should not go out.
>> So, just encrypting the data in transit and at rest does not help to be compliant with the rules. We need to make sure that data does not go out too.
>> The data that we are talking here is not just about the messages that are published to Anypoint MQ. It includes the apps running, transaction states, application logs, events, metric info and any other metadata. So, just replacing Anypoint MQ with a locally hosted ActiveMQ does NOT help.
>> The data that we are talking here is not just about the key/value pairs that are stored in Object Store. It includes the messages published, apps running, transaction states, application logs, events, metric info and any other metadata. So, just avoiding using Object Store does NOT help.
>> The only option left and also the right option in the given choices is to deploy application on runtime and control planes that are both within the jurisdiction.

Question No : 6

When must an API implementation be deployed to an Anypoint VPC?

A.When the API Implementation must invoke publicly exposed services that are deployed outside of CloudHub in a customer- managed AWS instance
B.When the API implementation must be accessible within a subnet of a restricted customer-hosted network that does not allow public access
C.When the API implementation must be deployed to a production AWS VPC using the Mule Maven plugin
D.When the API Implementation must write to a persistent Object Store

정답:

Question No : 7

An organization uses various cloud-based SaaS systems and multiple on-premises systems. The on-premises systems are an important part of the organization's application network and can only be accessed from within the organization's intranet.
What is the best way to configure and use Anypoint Platform to support integrations with both the cloud-based SaaS systems and on-premises systems?
A) Use CloudHub-deployed Mule runtimes in an Anypoint VPC managed by Anypoint Platform Private Cloud Edition control plane
B) Use CloudHub-deployed Mule runtimes in the shared worker cloud managed by the MuleSoft-hosted Anypoint Platform control plane
C) Use an on-premises installation of Mule runtimes that are completely isolated with NO external network access, managed by the Anypoint Platform Private Cloud Edition control plane
D) Use a combination of Cloud Hub-deployed and manually provisioned on-premises Mule runtimes managed by the MuleSoft-hosted Anypoint Platform control plane

A.Option A
B.Option B
C.Option C
D.Option D

정답:
Explanation:
Correct Answer Use a combination of CloudHub-deployed and manually provisioned on-premises Mule runtimes managed by the MuleSoft-hosted Platform control plane. Key details to be taken from the given scenario:
>> Organization uses BOTH cloud-based and on-premises systems
>> On-premises systems can only be accessed from within the organization's intranet
Let us evaluate the given choices based on above key details:
>> CloudHub-deployed Mule runtimes can ONLY be controlled using MuleSoft-hosted control plane. We CANNOT use Private Cloud Edition's control plane to control CloudHub Mule Runtimes. So, option suggesting this is INVALID
>> Using CloudHub-deployed Mule runtimes in the shared worker cloud managed by the MuleSoft-hosted Anypoint Platform is completely IRRELEVANT to given scenario and silly choice. So, option suggesting this is INVALID
>> Using an on-premises installation of Mule runtimes that are completely isolated with NO external network access, managed by the Anypoint Platform Private Cloud Edition control plane would work for On-premises integrations. However, with NO external access, integrations cannot be done to SaaS-based apps. Moreover CloudHub-hosted apps are best-fit for integrating with SaaS-based applications. So, option suggesting this is BEST WAY.
The best way to configure and use Anypoint Platform to support these mixed/hybrid integrations is to use a combination of CloudHub-deployed and manually provisioned on-premises Mule runtimes managed by the MuleSoft-hosted Platform control plane.

Question No : 8

How are an API implementation, API client, and API consumer combined to invoke and process an API?

A.The API consumer creates an API implementation, which receives API invocations from an API such that they are processed for an API client
B.The API client creates an API consumer, which receives API invocations from an API such that they are processed for an API implementation
C.The ApI consumer creates an API client, which sends API invocations to an API such that they are processed by an API implementation
D.The ApI client creates an API consumer, which sends API invocations to an API such that they are processed by an API implementation

정답:
Explanation:
Correct Answer The API consumer creates an API client, which sends API invocations to an API such
that they are processed by an API implementation
Terminology:
>> API Client - It is a piece of code or program the is written to invoke an API
>> API Consumer - An owner/entity who owns the API Client. API Consumers write API clients.
>> API - The provider of the API functionality. Typically an API Instance on API Manager where they are managed and operated.
>> API Implementation - The actual piece of code written by API provider where the functionality of the API is implemented. Typically, these are Mule Applications running on Runtime Manager.

Question No : 9

An API implementation is being designed that must invoke an Order API, which is known to repeatedly experience downtime.
For this reason, a fallback API is to be called when the Order API is unavailable.
What approach to designing the invocation of the fallback API provides the best resilience?

A.Search Anypoint Exchange for a suitable existing fallback API, and then implement invocations to this fallback API in addition to the Order API
B.Create a separate entry for the Order API in API Manager, and then invoke this API as a fallback API if the primary Order API is unavailable
C.Redirect client requests through an HTTP 307 Temporary Redirect status code to the fallback API whenever the Order API is unavailable
D.Set an option in the HTTP Requester component that invokes the Order API to instead invoke a fallback API whenever an HTTP 4xx or 5xx response status code is returned from the Order API

정답:
Explanation:
Correct Answer Search Anypoint exchange for a suitable existing fallback API, and then implement invocations to this fallback API in addition to the order API
>> It is not ideal and good approach, until unless there is a pre-approved agreement with the API
clients that they will receive a HTTP 3xx temporary redirect status code and they have to implement fallback logic their side to call another API.
>> Creating separate entry of same Order API in API manager would just create an another instance of it on top of same API implementation. So, it does NO GOOD by using clone od same API as a fallback API. Fallback API should be ideally a different API implementation that is not same as primary one.
>> There is NO option currently provided by Anypoint HTTP Connector that allows us to invoke a fallback API when we receive certain HTTP status codes in response.
The only statement TRUE in the given options is to Search Anypoint exchange for a suitable existing fallback API, and then implement invocations to this fallback API in addition to the order API.

Question No : 10

An Order API must be designed that contains significant amounts of integration logic and involves the invocation of the Product API.
The power relationship between Order API and Product API is one of "Customer/Supplier", because the Product API is used heavily throughout the organization and is developed by a dedicated development team located in the office of the CTO.
What strategy should be used to deal with the API data model of the Product API within the Order API?

A.Convince the development team of the Product API to adopt the API data model of the Order API such that the integration logic of the Order API can work with one consistent internal data model
B.Work with the API data types of the Product API directly when implementing the integration logic of the Order API such that the Order API uses the same (unchanged) data types as the Product API
C.Implement an anti-corruption layer in the Order API that transforms the Product API data model into internal data types of the Order API
D.Start an organization-wide data modeling initiative that will result in an Enterprise Data Model that will then be used in both the Product API and the Order API

정답:
Explanation:
Correct Answer Convince the development team of the product API to adopt the API data model of the Order API such that integration logic of the Order API can work with one consistent internal data model
Key details to note from the given scenario:
>> Power relationship between Order API and Product API is customer/supplier
So, as per below rules of "Power Relationships", the caller (in this case Order API) would request for features to the called (Product API team) and the Product API team would need to accomodate those requests.

Question No : 11

An organization is deploying their new implementation of the OrderStatus System API to multiple workers in CloudHub. This API fronts the organization's on-premises Order Management System, which is accessed by the API implementation over an IPsec tunnel.
What type of error typically does NOT result in a service outage of the OrderStatus System API?

A.A CloudHub worker fails with an out-of-memory exception
B.API Manager has an extended outage during the initial deployment of the API implementation
C.The AWS region goes offline with a major network failure to the relevant AWS data centers
D.The Order Management System is Inaccessible due to a network outage in the organization's on-premises data center

정답:
Explanation:
Correct Answer A CloudHub worker fails with an out-of-memory exception.
>> An AWS Region itself going down will definitely result in an outage as it does not matter how many workers are assigned to the Mule App as all of those in that region will go down. This is a complete downtime and outage.
>> Extended outage of API manager during initial deployment of API implementation will of course cause issues in proper application startup itself as the API Autodiscovery might fail or API policy templates and polices may not be downloaded to embed at the time of applicaiton startup etc...
there are many reasons that could cause issues.
>> A network outage onpremises would of course cause the Order Management System not accessible and it does not matter how many workers are assigned to the app they all will fail and cause outage for sure.
The only option that does NOT result in a service outage is if a cloudhub worker fails with an out-of-memory exception. Even if a worker fails and goes down, there are still other workers to handle the requests and keep the API UP and Running. So, this is the right answer.

Question No : 12

What correctly characterizes unit tests of Mule applications?

A.They test the validity of input and output of source and target systems
B.They must be run in a unit testing environment with dedicated Mule runtimes for the environment
C.They must be triggered by an external client tool or event source
D.They are typically written using MUnit to run in an embedded Mule runtime that does not require external connectivity

정답:
Explanation:
Correct Answer They are typically written using MUnit to run in an embedded Mule runtime that does not require external connectivity.
Below TWO are characteristics of Integration Tests but NOT unit tests:
>> They test the validity of input and output of source and target systems.
>> They must be triggered by an external client tool or event source.
It is NOT TRUE that Unit Tests must be run in a unit testing environment with dedicated Mule runtimes for the environment.
MuleSoft offers MUnit for writing Unit Tests and they run in an embedded Mule Runtime without needing any separate/ dedicated Runtimes to execute them. They also do NOT need any external
connectivity as MUnit supports mocking via stubs.
https://dzone.com/articles/munit-framework

Question No : 13

What is a typical result of using a fine-grained rather than a coarse-grained API deployment model to implement a given business process?

A.A decrease in the number of connections within the application network supporting the business process
B.A higher number of discoverable API-related assets in the application network
C.A better response time for the end user as a result of the APIs being smaller in scope and complexity
D.An overall tower usage of resources because each fine-grained API consumes less resources

정답:
Explanation:
Correct Answer A higher number of discoverable API-related assets in the application network. >> We do NOT get faster response times in fine-grained approach when compared to coarse-grained approach.
>> In fact, we get faster response times from a network having coarse-grained APIs compared to a network having fine-grained APIs model. The reasons are below.
Fine-grained approach:

Question No : 14

An organization has implemented a Customer Address API to retrieve customer address information. This API has been deployed to multiple environments and has been configured to enforce client IDs everywhere.
A developer is writing a client application to allow a user to update their address. The developer has found the Customer Address API in Anypoint Exchange and wants to use it in their client application.
What step of gaining access to the API can be performed automatically by Anypoint Platform?

A.Approve the client application request for the chosen SLA tier
B.Request access to the appropriate API Instances deployed to multiple environments using the client application's credentials
C.Modify the client application to call the API using the client application's credentials
D.Create a new application in Anypoint Exchange for requesting access to the API

정답:
Explanation:
Correct Answer Approve the client application request for the chosen SLA tier >> Only approving the client application request for the chosen SLA tier can be automated
>> Rest of the provided options are not valid
Reference: https://docs.mulesoft.com/api-manager/2.x/defining-sla-tiers#defining-a-tier

Question No : 15

What is typically NOT a function of the APIs created within the framework called API-led connectivity?

A.They provide an additional layer of resilience on top of the underlying backend system, thereby insulating clients from extended failure of these systems.
B.They allow for innovation at the user Interface level by consuming the underlying assets without being aware of how data Is being extracted from backend systems.
C.They reduce the dependency on the underlying backend systems by helping unlock data from backend systems In a reusable and consumable way.
D.They can compose data from various sources and combine them with orchestration logic to create higher level value.

정답:
Explanation:
Correct Answer They provide an additional layer of resilience on top of the underlying backend system, thereby insulating clients from extended failure of these systems. In API-led connectivity,
>> Experience APIs - allow for innovation at the user interface level by consuming the underlying assets without being aware of how data is being extracted from backend systems.
>> Process APIs - compose data from various sources and combine them with orchestration logic to create higher level value
>> System APIs - reduce the dependency on the underlying backend systems by helping unlock data from backend systems in a reusable and consumable way.
However, they NEVER promise that they provide an additional layer of resilience on top of the underlying backend system, thereby insulating clients from extended failure of these systems.
https://dzone.com/articles/api-led-connectivity-with-mule

Salesforce ARC-730 시험