Mulesoft MuleSoft Certified Architect MCIA-LEVEL-1-MAINTENANCE Questions & Answers

• Question 161:

  In one of the critical payment related mule application, transaction is being used . As an enhancement to implementation , scatter gather route is introduced which is also the part of transaction group. Scatter gather route has 4 routes.

  What will be the behavior of the Mule application in case of error occurs in 4th route of the scatter-gather router and transaction needs to be rolled back?

  A. Only errored route will be rolled back

  B. All routes will be rolled back

  C. Scatter Gather router cannot be part of transaction

  Correct Answer: B

  When running within a transaction, Scatter Gather does not execute in parallel. This means that the second route is executed after the first one is processed, the third after the second one, etc. In case of error, all routes will be rolled back

• Question 162:

  An organization is designing the following two Mule applications that must share data via a common persistent object store instance:

  - Mule application P will be deployed within their on-premises datacenter.

  -Mule application C will run on CloudHub in an Anypoint VPC.

  The object store implementation used by CloudHub is the Anypoint Object Store v2 (OSv2).

  what type of object store(s) should be used, and what design gives both Mule applications access to the same object store instance?

  A. Application P uses the Object Store connector to access a persistent object store Application C accesses this persistent object store via the Object Store REST API through an IPsec tunnel

  B. Application C and P both use the Object Store connector to access the Anypoint Object Store v2

  C. Application C uses the Object Store connector to access a persistent object Application P accesses the persistent object store via the Object Store REST API

  D. Application C and P both use the Object Store connector to access a persistent object store

  Correct Answer: C

  Correct answer is Application A accesses the persistent object store via the Object Store REST API Application B uses the Object Store connector to access a persistent object * Object Store v2 lets CloudHub applications store data and states across batch processes, Mule components and applications, from within an application or by using the Object Store REST API. * On-premise Mule applications cannot use Object Store v2. * You can select Object Store v2 as the implementation for Mule 3 and Mule 4 in CloudHub by checking the Object Store V2 checkbox in Runtime Manager at deployment time. * CloudHub Mule applications can use Object Store connector to write to the object store * The only way on- premises Mule applications can access Object Store v2 is via the Object Store REST API. * You can configure a Mule app to use the Object Store REST API to store and retrieve values from an object store in another Mule app.

• Question 163:

  49 of A popular retailer is designing a public API for its numerous business partners. Each business partner will invoke the API at the URL 58. https://api.acme.com/partnefs/vl. The API implementation is estimated to require deployment to 5 CloudHub workers.

  The retailer has obtained a public X.509 certificate for the name apl.acme.com, signed by a reputable CA, to be used as the server certificate.

  Where and how should the X.509 certificate and Mule applications be used to configure load balancing among the 5 CloudHub workers, and what DNS entries should be configured in order for the retailer to support its numerous business partners?

  A. Add the X.509 certificate to the Mule application's deployable archive, then configure a CloudHub Dedicated Load Balancer (DLB) for each of the Mule application's CloudHub workers Create a CNAME for api.acme.com pointing to the DLB's A record

  B. Add the X.509 certificate to the CloudHub Shared Load Balancer (SLB), not to the Mule application Create a CNAME for api.acme.com pointing to the SLB's A record

  C. Add the X.509 certificate to a CloudHub Dedicated Load Balancer (DLB), not to the Mule application Create a CNAME for api.acme.com pointing to the DLB's A record

  D. Add the x.509 certificate to the Mule application's deployable archive, then configure the CloudHub Shared Load Balancer (SLB) for each of the Mule application's CloudHub workers Create a CNAME for api.acme.com pointing to the SLB's A record

  Correct Answer: C

  *

  An X.509 certificate is a vital safeguard against malicious network impersonators. Without x.509 server authentication, man-in-the-middle attacks can be initiated by malicious access points, compromised routers, etc.

  *

  X.509 is most used for SSL/TLS connections to ensure that the client (e.g., a web browser) is not fooled by a malicious impersonator pretending to be a known, trustworthy website.

  *

  Coming to the question , we can not use SLB here as SLB does not allow to define vanity domain names. * Hence we need to use DLB and add certificate in there Hence correct answer is Add the X 509 certificate to the cloudhub Dedicated Load Balancer (DLB), not the Mule application. Create the CNAME for api.acme.com pointing to the DLB's record

• Question 164:

  Refer to the exhibit.

  

  A business process involves two APIs that interact with each other asynchronously over HTTP. Each API is implemented as a Mule application. API 1 receives the initial HTTP request and invokes API 2 (in a fire and forget fashion) while API

  2, upon completion of the processing, calls back into API l to notify about completion of the asynchronous process.

  Each API Is deployed to multiple redundant Mule runtimes and a separate load balancer, and is deployed to a separate network zone.

  In the network architecture, how must the firewall rules be configured to enable the above Interaction between API 1 and API 2?

  A. To authorize the certificate to be used both APIs

  B. To enable communication from each API's Mule Runtimes and Network zone to the load balancer of the other API

  C. To open direct two-way communication between the Mule Runtimes of both API's

  D. To allow communication between load balancers used by each API

  Correct Answer: B

  *

  If your API implementation involves putting a load balancer in front of your APIkit application, configure the load balancer to redirect URLs that reference the baseUri of the application directly. If the load balancer does not redirect URLs, any calls that reach the load balancer looking for the application do not reach their destination.

  *

  When you receive incoming traffic through the load balancer, the responses will go out the same way. However, traffic that is originating from your instance will not pass through the load balancer. Instead, it is sent directly from the public IP address of your instance out to the Internet. The ELB is not involved in that scenario.

  *

  The question says "each API is deployed to multiple redundant Mule runtimes", that seems to be a hint for self hosted Mule runtime cluster. Set Inbound allowed for the LB, outbound allowed for runtime to request out.

  *

  Hence correct way is to enable communication from each API's Mule Runtimes and Network zone to the load balancer of the other API. Because communication is asynchronous one Reference: https://docs.mulesoft.com/apikit/4.x/ configure-load-balancer-task

• Question 165:

  Anypoint Exchange is required to maintain the source code of some of the assets committed to it, such as Connectors, Templates, and API specifications.

  What is the best way to use an organization's source-code management (SCM) system in this context?

  A. Organizations should continue to use an SCM system of their choice, in addition to keeping source code for these asset types in Anypoint Exchange, thereby enabling parallel development, branching, and merging

  B. Organizations need to use Anypoint Exchange as the main SCM system to centralize versioning and avoid code duplication

  C. Organizations can continue to use an SCM system of their choice for branching and merging, as long as they follow the branching and merging strategy enforced by Anypoint Exchange

  D. Organizations need to point Anypoint Exchange to their SCM system so Anypoint Exchange can pull source code when requested by developers and provide it to Anypoint Studio

  Correct Answer: B

  *

  Organization should continue to use SCM system of their choice, in addition to keeping source code for these asset types in Anypoint Exchange, thereby enabling parallel development, branching.

  *

  Reason is that Anypoint exchange is not full fledged version repositories like GitHub.

  *

  But at same time it is tightly coupled with Mule assets

• Question 166:

  Refer to the exhibit.

  

  A Mule application is deployed to a cluster of two customer-hosted Mute runtimes. The Mute application has a flow that polls a database and another flow with an HTTP Listener.

  HTTP clients send HTTP requests directly to individual cluster nodes.

  What happens to database polling and HTTP request handling in the time after the primary (master) node of the cluster has railed, but before that node is restarted?

  A. Database polling continues Only HTTP requests sent to the remaining node continue to be accepted

  B. Database polling stops All HTTP requests continue to be accepted

  C. Database polling continues All HTTP requests continue to be accepted, but requests to the failed node Incur increased latency

  D. Database polling stops All HTTP requests are rejected

  Correct Answer: A

  Correct answer is Database polling continues Only HTTP requests sent to the remaining node continue to be accepted. : Architecture descripted in the question could be described as follows.When node 1 is down , DB polling will still continue via node 2 . Also requests which are coming directly to node 2 will also be accepted and processed in BAU fashion. Only thing that wont work is when requests are sent to Node 1 HTTP connector. The flaw with this architecture is HTTP clients are sending HTTP requests directly to individual cluster nodes. By default, clustering Mule runtime engines ensures high system availability. If a Mule runtime engine node becomes unavailable due to failure or planned downtime, another node in the cluster can assume the workload and continue to process existing events and messages

  

• Question 167:

  A project team uses RAML specifications to document API functional requirements and deliver API definitions. As per the current legal requirement, all designed API definitions to be augmented with an additional non-functional requirement to protect the services from a high rate of requests according to define service level agreements.

  Assuming that the project is following Mulesoft API governance and policies, how should the project team convey the necessary non-functional requirement to stakeholders?

  A. Create proxies in API manager for the non functional requirement and publish to exchange

  B. Add all non functional requirements as comments to RAML specification and publish to exchange

  C. Create various SLA's in API manager for the non functional requirement and publish to exchange

  D. Update API definitions with the fragment for the appropriate policy and publish to exchange

  Correct Answer: D

• Question 168:

  In which order are the API Client, API Implementation, and API interface components called in a typical REST request?

  A. API Client > API implementation > API Interface

  B. API interface > API Client > API Implementation

  C. API Client > API Interface > API implementation

  D. API Implementation > API Interface > API Client

  Correct Answer: A

• Question 169:

  A developer is examining the responses from a RESTful web service that is compliant with the Mypertext Transfer Protocol (HTTP/1.1) a8 defined by the Internet Engineering Task Force (IETF).

  In this HTTP/1.1-compliant web service, which class of HTTP response status codes should be specified to indicate when client requests are successfully received, understood, and accepted by the web service?

  A. 3xx

  B. 2xx

  C. 4xx

  D. 5xx

  Correct Answer: B

• Question 170:

  A company is designing an integration Mule application to process orders by submitting them to a back-end system for offline processing. Each order will be received by the Mule application through an HTTP5 POST and must be acknowledged immediately.

  Once acknowledged the order will be submitted to a back-end system. Orders that cannot be successfully submitted due to the rejections from the back-end system will need to be processed manually (outside the banking system).

  The mule application will be deployed to a customer hosted runtime and will be able to use an existing ActiveMQ broker if needed. The ActiveMQ broker is located inside the organization's firewall. The back-end system has a track record of unreliability due to both minor network connectivity issues and longer outages.

  Which combination of Mule application components and ActiveMQ queues are required to ensure automatic submission of orders to the back-end system while supporting but minimizing manual order processing?

  A. One or more On Error scopes to assist calling the back-end system An Untill successful scope containing VM components for long retries A persistent dead-letter VM queue configure in Cloud hub

  B. An Until Successful scope to call the back-end system One or more ActiveMQ long-retry queues One or more ActiveMQ dead-letter queues for manual processing

  C. One or more on-Error scopes to assist calling the back-end system one or more ActiveMQ long-retry queues A persistent dead-letter Object store configuration in the CloudHub object store service

  D. A batch job scope to call the back in system An Untill successful scope containing Object Store components for long retries. A dead-letter object store configured in the Mule application

  Correct Answer: B