200-901 Timed Practice Test 1 — 10 Questions

Question 1

A company uses a CI/CD pipeline to deploy network configurations. The pipeline includes a stage that runs automated tests against a simulated network environment. Which testing strategy does this represent?

Accepted Answer

Integration testing. Option C is correct because running automated tests against a simulated network environment validates how multiple network components (e.g., routers, switches, firewalls) interact as a whole. This is integration testing, which focuses on detecting interface and communication failures between integrated units, not on individual components or end-to-end system behavior. In a CI/CD pipeline for network configurations, this stage ensures that the combined changes work together before deployment to production.

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Regression testing

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Unit testing

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Smoke testing

Question 2

Which TWO statements about REST API design best practices are correct?

Accepted Answer

Resources should be represented using nouns in the URI. Option C is correct because REST API best practices dictate that URIs should represent resources (nouns), not actions. For example, '/users' or '/orders' clearly identifies the resource being manipulated, while verbs like '/getUsers' or '/createOrder' are discouraged as they conflate the resource with the operation.

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API versioning should be implemented using query parameters only

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HTTP PUT method should be used for partial updates to a resource

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Responses should return only HTTP status codes without a body

Question 3

A network engineer is using the Cisco Meraki API to retrieve a list of SSIDs for a specific network. The API returns an HTTP 200 status but an empty array for the SSIDs. Which of the following is the most likely cause?

Accepted Answer

The network exists but has no SSIDs configured.. An HTTP 200 status indicates the request was successfully processed by the Meraki API, meaning the API key, network ID, and request format were all valid. An empty array for SSIDs specifically means the network exists and the API queried it correctly, but no SSIDs have been configured on that network. This is the expected behavior when a network has no wireless profiles defined.

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The network ID is incorrect.

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The API key is invalid.

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The request body is malformed.

Question 4

When designing a REST API client for a Cisco DNA Center deployment, which authentication method should be used to obtain a token for subsequent API calls?

Accepted Answer

HTTP Basic authentication to obtain a token.. Cisco DNA Center uses HTTP Basic authentication to obtain a token. The client sends a POST request to the /dna/system/api/v1/auth/token endpoint with a Base64-encoded string of the username and password in the Authorization header. The server returns a token that must be included in subsequent API calls via the X-Auth-Token header.

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OAuth 2.0 client credentials grant.

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API key in the request header.

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Client certificate in the request.

Question 5

A Python script uses the Cisco Meraki API to create a new network and then immediately attempts to configure an SSID on that network. The SSID creation fails with a 400 error indicating 'network is not ready'. What is the most likely cause?

Accepted Answer

The network is not fully provisioned yet; a delay is needed.. The Meraki API returns a 400 error with 'network is not ready' because creating a network is an asynchronous operation. The network's underlying infrastructure (e.g., virtual LANs, DHCP scopes, firewall rules) must be fully provisioned before it can accept SSID configurations. Attempting to configure an SSID immediately after creation fails because the network is still in a 'pending' or 'provisioning' state, requiring a polling delay or retry logic.

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The API rate limit has been exceeded.

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The API key does not have write access to networks.

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The SSID name contains invalid characters.

Question 6

A DevOps team manages a multi-site Cisco Meraki network with 50 MX appliances and 200 MR access points. They use a Python script that calls the Meraki API to collect device utilization data every hour and stores it in a CSV file. Recently, the script started failing intermittently with HTTP 429 status codes. The team suspects rate limiting but notices that the failures occur even when only one script instance runs. The script uses a single API key and makes requests to the /devices/{serial}/uplink endpoint for each MX and the /devices/{serial}/wireless/status endpoint for each MR. The script is scheduled via cron and runs sequentially. The team wants to resolve the rate limiting while minimizing changes to the script. Which course of action should the team take?

Accepted Answer

Introduce a delay between API calls to stay within the rate limit.. The intermittent HTTP 429 errors indicate the script is exceeding the Meraki API rate limit, which applies per API key. Since the script runs sequentially with a single key, introducing a delay between API calls (e.g., using time.sleep()) is the simplest fix that stays within the rate limit without requiring architectural changes. This directly addresses the root cause while minimizing modifications to the existing script.

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Distribute the API requests across multiple API keys.

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Switch to a webhook-based approach to receive data instead of polling.

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Use the bulk API request feature to collect data in fewer calls.

Question 7

Refer to the exhibit. A network engineer applies this JSON-based QoS policy to a Cisco device using NETCONF/YANG. Which statement best describes the expected behavior for traffic from 10.0.0.0/24 with DSCP EF?

Accepted Answer

Traffic from 10.0.0.0/24 with DSCP EF is re-marked to AF41 and limited to 100 Mbps; excess is dropped.. Option C is correct because the JSON-based QoS policy uses a class map matching traffic from source 10.0.0.0/24 with DSCP EF, then applies a police action that re-marks exceeding traffic to AF41 and drops it when the rate exceeds 100 Mbps. This is a standard two-rate policer behavior in Cisco IOS QoS, where conforming traffic is transmitted unchanged and exceeding traffic is re-marked and dropped.

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Traffic with DSCP EF from any source is re-marked to AF41 and dropped if exceeding 100 Mbps.

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The policy is invalid because DSCP values cannot be changed in a QoS policy.

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Traffic from 10.0.0.0/24 is re-marked to DSCP EF, then policed at 100 Mbps.

Question 8

Which TWO of the following are characteristics of Model-Driven Programmability with YANG models?

Accepted Answer

YANG models define a hierarchical data tree.. Option A is correct because YANG models define a hierarchical data tree structure that organizes configuration and state data in a parent-child relationship, mirroring the structure of the device's operational and configuration data. This hierarchical representation allows for precise, path-based access to individual data nodes, which is fundamental to model-driven programmability.

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YANG models are only used with the Python library ncclient.

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The controller directly pushes configurations to network devices without validation.

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NETCONF requires JSON encoding for configuration data.

Question 9

Refer to the exhibit. A developer sends a PUT request to the RESTCONF endpoint with the above JSON payload. The device already has interface GigabitEthernet1/0/1 configured with IP address 10.10.10.1/24. What is the expected outcome?

Accepted Answer

The request succeeds and the interface configuration remains unchanged.. D is correct because the PUT request to the RESTCONF endpoint with the provided JSON payload is an idempotent operation. Since the interface GigabitEthernet1/0/1 already exists with the exact same configuration (IP address 10.10.10.1/24), the PUT request effectively replaces the resource with the same data, resulting in no change. RESTCONF uses the HTTP PUT method to create or replace a resource, and if the resource already exists and the payload matches, the operation succeeds without modification.

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The request fails because the interface already exists.

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The request creates a new interface with the same configuration.

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The request fails because the JSON is malformed.

Question 10

A network engineer is troubleshooting slow connectivity between two sites connected via a WAN link. The engineer suspects packet loss due to collisions. Which interface counter should be examined to confirm this?

Accepted Answer

CRC errors. CRC (Cyclic Redundancy Check) errors indicate that frames received on an interface have failed the integrity check, which is often caused by physical-layer issues such as collisions, faulty cabling, or signal degradation. In the context of a WAN link, collisions are not typical (since full-duplex is standard), but if the link is misconfigured as half-duplex, collisions can occur and will manifest as CRC errors. Thus, examining the CRC errors counter is the correct way to confirm packet loss due to collisions.

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Runts

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Output errors

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Giants