Exam 350-901 topic 1 question 314 discussion

Actual exam question from Cisco's 350-901

Question #: 314
Topic #: 1

An application is made up of multiple microservices, each communicating via APIs. One service is beginning to be a bottleneck for the application because it can take a lot of time to complete requests. An engineer tried adding additional instances of this service behind the load balancer, but it did not have any effect. Which application design change must be implemented in this scenario?

A. Deploy an API gateway to centralize all inbound communication requests and offload authentication.
B. Vendor all dependencies into the service that is causing delays to remove external dependency checks.
C. Move from synchronous to asynchronous interactions with the service and implement a message queue.
D. Leverage serverless architecture instead of containers to gain the advantage of event driven APIs.

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Suggested Answer: C 🗳️

by lancejack2021 at April 30, 2023, 6:52 p.m.

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whipmuffin

6 months, 1 week ago

Selected Answer: C

I agree that the best answer is **C. Move from synchronous to asynchronous interactions with the service and implement a message queue**¹²³⁴⁵. This is because synchronous communication creates a **chain** of requests between microservices that can cause **delays** and **bottlenecks**¹²⁴. Asynchronous communication allows microservices to use **messages** or **polling** to communicate with other microservices without waiting for a response¹²³⁴. A message queue is a mechanism that enables asynchronous communication by storing and delivering messages between microservices³⁵. This can improve the **performance**, **scalability**, and **resilience** of the application¹²⁵.

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