200-901 Practice Questions 2 — 50 Questions

Question 1

Refer to the exhibit. Which key-value pair indicates whether this Meraki MR is currently connected to the cloud?

Accepted Answer

"status": "online". The 'status' key with the value 'online' directly indicates that the Meraki MR access point is currently connected to the Meraki cloud. In the Meraki dashboard API response, the 'status' field reflects the device's cloud connectivity state, where 'online' means the device has an active connection to the Meraki cloud controller.

Answer

"serial": "Q2XX-XXXX-XXXX"

Answer

"lanIp": "192.168.1.100"

Answer

"model": "MR42"

Question 2

Match each Python library to its typical use in network automation.

Accepted Answer

Netmiko: Simplifies SSH connections to network devices. Netmiko, NAPALM, Paramiko, and PyEZ are common Python libraries in network automation. Netmiko simplifies SSH, NAPALM provides a vendor-agnostic API, Paramiko is a low-level SSH library, and PyEZ is Juniper-specific. Common confusions include mixing Netmiko with HTTP libraries and NAPALM with vendor-specific tools.

Answer

Netmiko: Used for HTTP REST API calls

Answer

NAPALM: Juniper-specific library for automation

Question 3

Using the Cisco DNA Center API, an engineer wants to create a new site with building and floor information. Which HTTP method and endpoint should be used?

Accepted Answer

POST /dna/intent/api/v1/site. The POST HTTP method is used to create a new resource on the server, and the Cisco DNA Center API endpoint `/dna/intent/api/v1/site` is designed to accept a POST request with a JSON payload containing site, building, and floor details. This follows RESTful conventions where POST is the standard method for resource creation, and the API documentation specifies this exact endpoint for adding a new site hierarchy.

Answer

PUT /dna/intent/api/v1/site

Answer

GET /dna/intent/api/v1/site

Answer

POST /dna/intent/api/v1/site/create

Question 4

A network engineer wants to stream telemetry data from a Cisco router using gRPC. Which gRPC service model is typically used for the router to push data to a collector?

Accepted Answer

Dial-out model. Dial-out streaming (also called telemetry push) is where the device initiates the connection and sends data to the collector. Dial-in is where the collector pulls data from the device.

Answer

RESTCONF events

Answer

NETCONF subscription

Answer

Dial-in model

Question 5

In a microservices architecture, which of the following is a primary advantage over a monolithic architecture?

Accepted Answer

Independent deployability and scaling of services. Microservices decompose an application into independently deployable services, each owning its own lifecycle. This enables teams to deploy, scale, and update services independently without redeploying the entire application, which is the primary advantage over a monolith. Independent deployability and scaling directly improve agility and fault isolation.

Answer

Easier end-to-end testing

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Lower operational overhead

Answer

Simpler inter-service communication

Question 6

An engineer is using the Cisco Intersight API to manage UCS servers. The API response returns a paginated list. What is the proper way to retrieve all items?

Accepted Answer

Loop through pages using the 'next' link in the response. The Cisco Intersight API uses cursor-based pagination, where each page response includes a 'next' link pointing to the next page of results. To retrieve all items, you must follow that link in a loop until the 'next' field is null or absent, ensuring you get every page without assuming a fixed offset or page size.

Answer

Increase the page size limit to maximum

Answer

Send multiple requests with different offsets manually

Answer

Use a single request with a filter to get all

Question 7

A Python script using the Cisco Meraki SDK fails with 'APIError: 429 Too Many Requests'. What action should the developer take?

Accepted Answer

Add a retry mechanism with exponential backoff. The HTTP 429 status code indicates rate limiting has been exceeded. The Meraki API enforces rate limits to protect its infrastructure, and the SDK's built-in retry mechanism with exponential backoff is the correct way to handle this, as it automatically waits increasing intervals between retries, respecting the Retry-After header if present.

Answer

Increase the timeout value

Answer

Change the HTTP method to POST

Answer

Use a different API key

Question 8

A developer is using Git for version control of a Python library. A colleague accidentally committed a large sensitive file. Which Git command sequence should be used to remove the file from history without losing subsequent changes?

Accepted Answer

git filter-branch or git filter-repo. `git filter-branch` and `git filter-repo` are designed to rewrite Git history, allowing you to permanently remove a large sensitive file from all commits. This is necessary when a file has been committed and pushed, as simple removal with `git rm` only affects the latest commit and leaves the file accessible in prior history. Using these commands ensures the file is purged from the entire repository history without losing subsequent changes, as they replay the commit graph while filtering out the specified file.

Answer

git rm --cached && git commit

Answer

git rebase -i && git commit --amend

Answer

git revert HEAD

Question 9

Which data serialization format is most commonly used for configuration files in Cisco automation tools like Ansible?

Accepted Answer

YAML. YAML is the most commonly used data serialization format for configuration files in Cisco automation tools like Ansible because it is human-readable, supports complex data structures (lists, dictionaries), and is natively parsed by Ansible playbooks. Cisco's automation solutions, including those for network devices, rely on YAML for defining tasks, variables, and inventory files due to its minimal syntax and compatibility with Jinja2 templating.

Answer

CSV

Answer

HTML

Answer

XML

Question 10

Which Git command is used to switch to an existing branch named 'feature-x' and update the working directory?

Accepted Answer

git checkout feature-x. `git checkout feature-x` is the traditional Git command that switches the HEAD reference to the existing branch 'feature-x' and updates the working directory to match that branch's commit history. This command performs both the branch switch and the working tree update in one operation, which is the core requirement of the question.

Answer

git merge feature-x

Answer

git branch feature-x

Answer

git switch -c feature-x

Question 11

A developer runs 'docker run -d -p 8080:80 --name web nginx:alpine'. The container fails to start. Which command is the most appropriate to investigate the issue?

Accepted Answer

docker logs -f web. `docker logs -f web` streams the container's stdout and stderr output, which typically contains the error message explaining why the container failed to start (e.g., port conflict, missing configuration, or process crash). Since the container is not running, `docker logs` is the primary diagnostic tool to retrieve its exit logs without requiring the container to be active.

Answer

docker inspect web

Answer

docker exec -it web bash

Question 12

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.

Answer

The request fails because the interface already exists.

Answer

The request creates a new interface with the same configuration.

Answer

The request fails because the JSON is malformed.

Question 13

A developer is using the Cisco Webex API to send a message to a specific room. They have the room ID. Which endpoint and method should they use?

Accepted Answer

POST /v1/messages with roomId in the body. To send a message to a Webex room, the correct endpoint is POST /v1/messages with roomId in the body.

Answer

PUT /v1/messages/{messageId}

Answer

POST /v1/rooms with roomId in the body

Answer

GET /v1/messages?roomId=...

Question 14

A developer is writing an application that needs to send a large amount of data reliably over a network. Which transport layer protocol should the developer use?

Accepted Answer

TCP. TCP (Transmission Control Protocol) is the correct choice because it provides reliable, connection-oriented data delivery with acknowledgments, retransmission, and sequencing. This ensures that large amounts of data are transmitted without loss or corruption, which is critical for applications requiring data integrity.

Answer

ICMP

Answer

HTTP

Answer

UDP

Question 15

Which OSI layer is responsible for routing packets across different networks?

Accepted Answer

Layer 3 (Network). The Network layer (Layer 3) is responsible for logical addressing and routing packets between different networks. Protocols like IP (IPv4/IPv6) use routing tables and algorithms (e.g., OSPF, BGP) to determine the best path for forwarding packets across multiple hops. Without Layer 3, traffic could not leave a local broadcast domain.

Answer

Layer 1 (Physical)

Answer

Layer 4 (Transport)

Answer

Layer 2 (Data Link)

Question 16

Which TCP flag is set in the second step of the three-way handshake?

Accepted Answer

SYN and ACK. The TCP three-way handshake begins with the client sending a SYN segment to initiate a connection. In the second step, the server responds with a SYN-ACK segment, which both acknowledges the client's SYN (using the ACK flag) and synchronizes its own sequence number (using the SYN flag). This combined flag is essential for establishing a reliable, bidirectional connection.

Answer

ACK

Answer

SYN

Answer

FIN

Question 17

A Kubernetes pod needs to run a database that requires persistent storage. Which volume type should be used to store data that persists beyond the pod lifecycle?

Accepted Answer

PersistentVolumeClaim. PersistentVolumeClaim requests persistent storage that survives pod restarts. emptyDir is ephemeral, hostPath ties to a node, configMap is for configuration.

Answer

emptyDir

Answer

configMap

Answer

hostPath

Question 18

A developer wants to automate the provisioning of a UCS server using Cisco Intersight. Which authentication method is recommended for programmatic access?

Accepted Answer

API Key with HMAC signing. Cisco Intersight recommends API key authentication with HMAC signing for programmatic access because it provides a secure, non-interactive method for automation scripts and tools. The API key consists of a key ID and a secret, and each request must include an HMAC signature generated from the request details, ensuring integrity and authenticity without exposing static credentials over the network.

Answer

Basic authentication with username and password

Answer

Session token from Intersight UI

Answer

OAuth2 with client credentials

Question 19

A developer needs to retrieve the current user's details from Webex API. Which endpoint should they call?

Accepted Answer

GET /v1/people/me. GET /v1/people/me returns details of the authenticated user.

Answer

GET /v1/rooms?me=true

Answer

POST /v1/people

Answer

GET /v1/people?email=current@user.com

Question 20

Which wireless security standard provides the strongest encryption and is recommended for enterprise networks as of 2023?

Accepted Answer

WPA3. WPA3 is the latest standard with stronger encryption (SAE) and is recommended for modern networks.

Answer

WEP

Answer

TKIP

Answer

WPA2