MCPA-Level 1 exam 実際試験問題と解答 - 模擬練習 - 受験自信を増やす

Question No : 1
What best describes the Fully Qualified Domain Names (FQDNs), also known as DNS entries, created when a Mule application is deployed to the CloudHub Shared Worker Cloud?

A.A fixed number of FQDNs are created, IRRESPECTIVE of the environment and VPC design
B.The FQDNs are determined by the application name chosen, IRRESPECTIVE of the region
C.The FQDNs are determined by the application name, but can be modified by an administrator after deployment
D.The FQDNs are determined by both the application name and the Anypoint Platform organization

正解:
Explanation:
Correct Answer. The FQDNs are determined by the application name chosen,
IRRESPECTIVE of the region
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>> When deploying applications to Shared Worker Cloud, the FQDN are always determined by application name chosen.
>> It does NOT matter what region the app is being deployed to.
>> Although it is fact and true that the generated FQDN will have the region included in it (Ex: exp-salesorder-api.au-s1.cloudhub.io), it does NOT mean that the same name can be used when deploying to another CloudHub region.
>> Application name should be universally unique irrespective of Region and Organization and solely determines the FQDN for Shared Load Balancers.

Question No : 2
Central IT owns and focuses on System Layer APIs

正解: C
Explanation:
Correct Answer:

Question No : 3
A system API is deployed to a primary environment as well as to a disaster recovery (DR) environment, with different DNS names in each environment. A process API is a client to the system API and is being rate limited by the system API, with different limits in each of the environments. The system API's DR environment provides only 20% of the rate limiting offered by the primary environment .
What is the best API fault-tolerant invocation strategy to reduce overall errors in the process API, given these conditions and constraints?

A.Invoke the system API deployed to the primary environment; add timeout and retry logic to the process API to avoid intermittent failures; if it still fails, invoke the system API deployed to the DR environment
B.Invoke the system API deployed to the primary environment; add retry logic to the process API to handle intermittent failures by invoking the system API deployed to the DR environment
C.In parallel, invoke the system API deployed to the primary environment and the system API deployed to the DR environment; add timeout and retry logic to the process API to avoid intermittent failures; add logic to the process API to combine the results
D.Invoke the system API deployed to the primary environment; add timeout and retry logic to the process API to avoid intermittent failures; if it still fails, invoke a copy of the process API deployed to the DR environment

正解:
Explanation:
Correct Answer. Invoke the system API deployed to the primary environment; add timeout and retry logic to the process API to avoid intermittent failures; if it still fails, invoke the system API deployed to the DR environment
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There is one important consideration to be noted in the question which is - System API in DR environment provides only 20% of the rate limiting offered by the primary environment. So, comparitively, very less calls will be allowed into the DR environment API opposed to its primary environment. With this in mind, lets analyse what is the right and best fault-tolerant invocation strategy.

Question No : 4
A REST API is being designed to implement a Mule application.
What standard interface definition language can be used to define REST APIs?

A.Web Service Definition Language(WSDL)
B.OpenAPI Specification (OAS)
C.YAML
D.AsyncAPI Specification

正解:

Question No : 5
An API implementation is deployed to CloudHub.
What conditions can be alerted on using the default Anypoint Platform functionality, where the alert conditions depend on the end-to-end request processing of the API implementation?

A.When the API is invoked by an unrecognized API client
B.When a particular API client invokes the API too often within a given time period
C.When the response time of API invocations exceeds a threshold
D.When the API receives a very high number of API invocations

正解:
Explanation:
Correct Answer. When the response time of API invocations exceeds a threshold
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>> Alerts can be setup for all the given options using the default Anypoint Platform functionality
>> However, the question insists on an alert whose conditions depend on the end-to-end request processing of the API implementation.
>> Alert w.r.t "Response Times" is the only one which requires end-to-end request
processing of API implementation in order to determine if the threshold is exceeded or not.
Reference: https://docs.mulesoft.com/api-manager/2.x/using-api-alerts

Question No : 6
The responses to some HTTP requests can be cached depending on the HTTP verb used in the request. According to the HTTP specification, for what HTTP verbs is this safe to do?

A.PUT, POST, DELETE
B.GET, HEAD, POST
C.GET, PUT, OPTIONS
D.GET, OPTIONS, HEAD

正解:
Explanation:
Correct Answer. GET, OPTIONS, HEAD

http://restcookbook.com/HTTP%20Methods/idempotency/

Question No : 7
A company uses a hybrid Anypoint Platform deployment model that combines the EU control plane with customer-hosted Mule runtimes. After successfully testing a Mule API implementation in the Staging environment, the Mule API implementation is set with environment-specific properties and must be promoted to the Production environment .
What is a way that MuleSoft recommends to configure the Mule API implementation and automate its promotion to the Production environment?

A.Bundle properties files for each environment into the Mule API implementation's deployable archive, then promote the Mule API implementation to the Production environment using Anypoint CLI or the Anypoint Platform REST APIs
B.Modify the Mule API implementation's properties in the API Manager Properties tab, then promote the Mule API implementation to the Production environment using API Manager
C.Modify the Mule API implementation's properties in Anypoint Exchange, then promote the Mule API implementation to the Production environment using Runtime Manager
D.Use an API policy to change properties in the Mule API implementation deployed to the Staging environment and another API policy to deploy the Mule API implementation to the Production environment

正解:
Explanation:
Correct Answer. Bundle properties files for each environment into the Mule API implementation's deployable archive, then promote the Mule API implementation to the Production environment using Anypoint CLI or the Anypoint Platform REST APIs
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>> Anypoint Exchange is for asset discovery and documentation. It has got no provision to modify the properties of Mule API implementations at all.
>> API Manager is for managing API instances, their contracts, policies and SLAs. It has also got no provision to modify the properties of API implementations.
>> API policies are to address Non-functional requirements of APIs and has again got no provision to modify the properties of API implementations.
So, the right way and recommended way to do this as part of development practice is to bundle properties files for each environment into the Mule API implementation and just point and refer to respective file per environment.

Question No : 8
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

正解:
Explanation:
Correct Answer. They are typically written using MUnit to run in an embedded Mule runtime that does not require external connectivity.
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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 : 9
A company requires Mule applications deployed to CloudHub to be isolated between non-production and production environments. This is so Mule applications deployed to non-production environments can only access backend systems running in their customer-hosted non-production environment, and so Mule applications deployed to production environments can only access backend systems running in their customer-hosted production environment .
How does MuleSoft recommend modifying Mule applications, configuring environments, or changing infrastructure to support this type of per-environment isolation between Mule applications and backend systems?

A.Modify properties of Mule applications deployed to the production Anypoint Platform environments to prevent access from non-production Mule applications
B.Configure firewall rules in the infrastructure inside each customer-hosted environment so that only IP addresses from the corresponding Anypoint Platform environments are allowed to communicate with corresponding backend systems
C.Create non-production and production environments in different Anypoint Platform business groups
D.Create separate Anypoint VPCs for non-production and production environments, then configure connections to the backend systems in the corresponding customer-hosted environments

正解:
Explanation:
Correct Answer. Create separate Anypoint VPCs for non-production and production environments, then configure connections to the backend systems in the corresponding customer-hosted environments.
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>> Creating different Business Groups does NOT make any difference w.r.t accessing the non-prod and prod customer-hosted environments. Still they will be accessing from both Business Groups unless process network restrictions are put in place.
>> We need to modify or couple the Mule Application Implementations with the environment. In fact, we should never implements application coupled with environments by binding them in the properties. Only basic things like endpoint URL etc should be bundled in properties but not environment level access restrictions.
>> IP addresses on CloudHub are dynamic until unless a special static addresses are assigned. So it is not possible to setup firewall rules in customer-hosted infrastrcture. More over, even if static IP addresses are assigned, there could be 100s of applications running on cloudhub and setting up rules for all of them would be a hectic task, non-maintainable and definitely got a good practice.
>> The best practice recommended by Mulesoft (In fact any cloud provider), is to have your Anypoint VPCs seperated for Prod and Non-Prod and perform the VPC peering or VPN tunneling for these Anypoint VPCs to respective Prod and Non-Prod customer-hosted
environment networks.
https://docs.mulesoft.com/runtime-manager/virtual-private-cloud
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Question No : 10
Due to a limitation in the backend system, a system API can only handle up to 500 requests per second .
What is the best type of API policy to apply to the system API to avoid overloading the backend system?

A.Rate limiting
B.HTTP caching
C.Rate limiting - SLA based
D.Spike control

正解:
Explanation:
Correct Answer. Spike control
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>> First things first, HTTP Caching policy is for purposes different than avoiding the backend system from overloading. So this is OUT.
>> Rate Limiting and Throttling/ Spike Control policies are designed to limit API access, but have different intentions.
>> Rate limiting protects an API by applying a hard limit on its access.
>> Throttling/ Spike Control shapes API access by smoothing spikes in traffic.
That is why, Spike Control is the right option.

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

正解:
Explanation:
Correct Answer. A CloudHub worker fails with an out-of-memory exception.
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>> 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
An organization makes a strategic decision to move towards an IT operating model that emphasizes consumption of reusable IT assets using modern APIs (as defined by MuleSoft).
What best describes each modern API in relation to this new IT operating model?

A.Each modern API has its own software development lifecycle, which reduces the need for documentation and automation
B.Each modem API must be treated like a product and designed for a particular target audience (for instance, mobile app developers)
C.Each modern API must be easy to consume, so should avoid complex authentication mechanisms such as SAML or JWT D
D.Each modern API must be REST and HTTP based

正解:
Explanation:
Correct Answers:

Question No : 13
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

正解:
Explanation:
Correct Answer. Workers are randomly distributed across available AZs within that region.
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>> 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.
https://help.mulesoft.com/s/question/0D52T000051rqDj/one-cloudhub-aws-region-how-cloudhub-workers-are-assigned-to-availability-zones-azs-
Graphical user interface, application
Description automatically generated
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Question No : 14
Which of the following sequence is correct?

A.API Client implementes logic to call an API >> API Consumer requests access to API >> API Implementation routes the request to >> API
B.API Consumer requests access to API >> API Client implementes logic to call an API >> API routes the request to >> API Implementation
C.API Consumer implementes logic to call an API >> API Client requests access to API >> API Implementation routes the request to >> API
D.API Client implementes logic to call an API >> API Consumer requests access to API >> API routes the request to >> API Implementation

正解:
Explanation:
Correct Answer. API Consumer requests access to API >> API Client implementes logic to call an API >> API routes the request to >> API Implementation
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>> API consumer does not implement any logic to invoke APIs. It is just a role. So, the option stating "API Consumer implementes logic to call an API" is INVALID.
>> API Implementation does not route any requests. It is a final piece of logic where
functionality of target systems is exposed. So, the requests should be routed to the API implementation by some other entity. So, the options stating "API Implementation routes the request to >> API" is INVALID
>> The statements in one of the options are correct but sequence is wrong. The sequence is given as "API Client implementes logic to call an API >> API Consumer requests access to API >> API routes the request to >> API Implementation". Here, the statements in the options are VALID but sequence is WRONG.
>> Right option and sequence is the one where API consumer first requests access to API on Anypoint Exchange and obtains client credentials. API client then writes logic to call an API by using the access client credentials requested by API consumer and the requests will be routed to API implementation via the API which is managed by API Manager.

Question No : 15
Make consumption of assets at the rate of production

正解: C
Explanation:
Correct Answer.

Mulesoft MCPA-Level 1 exam 問題練習