Developing Applications using Cisco Core Platforms and APIs (DEVCOR)385 questions across 39 pages are complete and free, with no account or card.
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Which telemetry transport option allows the desired configuration of metrics to be centrally maintained on the collector?
Answer: D
MDT has dial-in and dial-out session types and dial-in is used from the collector to dynamically subscribe to desired resource
Source: Adapted from community discussion — razvan999
DRAG DROP - Drag and drop the code snippets from the bottom onto the blanks in the code on the RESTCONF request to retrieve a list of configured interfaces on a Cisco IOS XE device. Not all options are used.
This is an interactive task on the real exam — a drag-and-drop, hotspot or ordering question. There is nothing to select here, so the answer is shown below for reference.
Answer: See figure below
A developer is developing a microservices code to manage REST API errors. Which two approaches must the developer take to manage the HTTP 429 "Too Many Requests" status code in the microservices code? (Choose two.)
Answer: AC
A. Implement subsequent retry with the same interval window. C. Consecutive retries should truncate exponential backup. HTTP 429 "Too Many Requests" response status code indicates that the user has sent too many requests in a given amount of time ("rate limiting"). In response to this, the developer can implement subsequent retries with the same interval window, which means the code should try to resend the request after a specific period of time. The developer can also use an approach known as "exponential backoff", where the delay between subsequent retries increases exponentially, rather than linearly, to give the server more room to recover. However, to prevent the delay from becoming too large, the exponential increase should be truncated at a certain point, which is what is meant by "consecutive retries should truncate exponential backup".
Source: Adapted from community discussion — 1a63556
A new monitoring solution has these requirements: • Collect real-time telemetry. • Pull SNMP data from all network devices. • Visualize data in graphs. Which type of database should be used to store the data?
Answer: C
An engineer needs to improve the responsiveness of an application by implementing client-side HTTP caching. The cached data must be cacheable by everyone and must be validated during each request. Which value must the engineer set in the Cache-Control header to meet these requirements?
Answer: B
B. no-cache The no-cache directive in the Cache-Control HTTP header allows the data to be cached but requires that the cached version is revalidated with the server before being served to the client in response to subsequent requests. This ensures that the client always receives the most up-to-date data while still benefiting from caching to improve performance. It's worth mentioning that the term no-cache might be a bit misleading as it does not prevent caching; it only requires revalidation of the cache.
Source: Adapted from community discussion — 1a63556
Refer to the exhibit. A devops engineer activates an intent-based policy in the Cisco DNA Center using the asynchronous API, which returns an HTTP 202 status code. How does the engineer validate that the policy has eventually succeeded or failed?
Answer: A
A and B are both an option. {url} is the same as /dna/intent/api/v1/task/{taskId} I vote A thought since it is easier and less likely to have an error.
Source: Adapted from community discussion — Ch33s3y
A developer deployed a web application in a local data center that is experiencing high traffic load from users that access data through REST API calls. Caching helps to enhance the responsiveness and performance of the API usage. Which approach must be used to improve cache performance?
Answer: B
B. Implement surrogate key tagging to purge requests. Surrogate key tagging can significantly improve cache performance. It involves associating each cache item with a surrogate key. When an item is updated, instead of invalidating each cache item individually, you can invalidate all cache items associated with the surrogate key in one action, which is much more efficient. This approach is particularly useful when the same data is cached in multiple ways or when data is nested or complex.
Source: Adapted from community discussion — 1a63556
An engineer is developing an application to use across organizations. The application will process sensitive data and access will be allowed from the internet. The application will need to store the session ID of the users. This must be implemented using a secure management mechanism. Which secret storage approach must the engineer take to meet these requirements?
Answer: D
D. Non-persistent cookie A non-persistent cookie is a more secure method for storing session IDs because these cookies are stored only in temporary memory, and they are deleted when the user closes the browser. They do not record any information on the user's hard drive and therefore cannot be used to gather data about the user or to deliver viruses or other harmful payloads. In addition, they are more resilient to cross-site scripting (XSS) attacks because they do not persist across sessions. This makes them a suitable choice for storing sensitive data such as session IDs in a secure manner.
Source: Adapted from community discussion — 1a63556
Which action reduces latency in a microservices application?
Answer: A
A. Run microservices at the edge, on the periphery of the network. Running microservices at the edge of the network, also known as edge computing, reduces latency by bringing data processing closer to the source of the data. This shortens the distance that data has to travel, resulting in faster response times. This is particularly beneficial for applications that require real-time or near real-time processing. Edge computing also can reduce traffic in the network core by processing data locally, rather than sending it back and forth across the network.
Source: Adapted from community discussion — 1a63556
A developer must apply a new feature on a live project. After the commit, it was discovered that the wrong file was applied. The developer must undo the single commit and apply the file with the name feat-EXP453928854DPS. Which command must the developer use?
Answer: C
C. git revert In this case, the developer would want to use the `git revert` command. This command creates a new commit that undoes the changes made in the previous commit. This is a safe way to undo changes, as it doesn't alter the existing history. The `git reset` command does undo changes, but it does so by discarding commits in a way that is potentially unsafe, as you can lose changes permanently. The `git checkout` command is used to switch branches or restore working tree files, among its other uses. The `git clean` command is used to remove untracked files from the working directory.
Source: Adapted from community discussion — 1a63556
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