CCNA Cisco Platforms and Development Questions

The Webex messaging endpoint accepts POST /v1/messages, and targeting an existing space requires the roomId field in the JSON body alongside text. This call satisfies the constraint of using the already-obtained room ID to post into that specific room.

Creating a room is a resource-creation action on the rooms collection, so the Webex REST API expects POST to /v1/rooms with the room title in the JSON body. GET retrieves, PUT updates, and DELETE removes; only POST creates a new room.

The Meraki Dashboard API requires the API key to be passed in the X-Cisco-Meraki-API-Key header. This is the standard authentication method for all Meraki API calls. Without this header, the API returns a 401 Unauthorized response. The developer must include it in every request to access organization data.

Cisco Meraki's cloud dashboard exposes a RESTful API authenticated via the X-Cisco-Meraki-API-Key header, satisfying the stem's exact requirement. Unlike on-premises controllers such as DNA Center, which use token-based authentication, Meraki's cloud-managed model issues a per-organisation API key passed directly in that header.

A webhook with resource 'messages' and event 'created' satisfies the real-time notification constraint: Webex pushes an HTTP POST to your target URL the instant a message is posted, avoiding polling. The 'created' event scopes delivery to new messages only, matching the stem's requirement precisely.

The memberships resource is the correct endpoint for adding a person to a space. A POST request with roomId and personEmail in the JSON body creates the membership, and the API returns the new membership object including its ID. This matches the requirement to add a person to a space programmatically.

The Webhooks API satisfies the real-time notification constraint by having Webex push an HTTP POST to your listener the moment a message is created in the room, eliminating polling. Subscriptions target specific resources and events, so a messages/created subscription on that room delivers immediate delivery.

The "Change your network" API category in DNA Center handles configuration deployment, including applying templates to devices via the Template Programmer. It satisfies the stem's requirement to deploy templates, unlike Intent APIs (policy) or Integration APIs (events). This category directly provisions device configuration changes.

The event syslog pattern trigger fires the applet when an incoming syslog message matches a specified regular expression. That directly satisfies the requirement to react to a specific syslog message, unlike timer or interface-based triggers which cannot inspect log content.

Cisco DNA Center issues a token on authentication, and subsequent calls must carry it in the X-Auth-Token HTTP header. This satisfies the API's authorisation requirement, letting the developer call protected endpoints without resending credentials each time.

The organizationId is required because networks belong to an organization. Many Meraki API endpoints, such as those for networks, are nested under /organizations/{organizationId}/networks. Without the organizationId, the API cannot determine which organization's networks to access, resulting in an error.

GET /dna/intent/api/v1/network-device satisfies the requirement to retrieve the device inventory from Cisco DNA Center. The Intent API exposes network-device as a read-only collection, and issuing GET against it returns all managed devices with their details, matching the developer's need to list network devices.

To add a member to a Webex space, the developer must send a POST request to /v1/memberships with the room ID and the email of the person to add. The API creates a membership and returns the details. This is the correct method for adding a new member to a space.

`feature nxapi` activates the NX-API management interface on NX-OS, exposing CLI over HTTP/HTTPS for programmatic access. This satisfies the stem's requirement to enable the feature itself, since NX-API remains dormant until this command runs in configuration mode. Without it, REST calls to the device fail regardless of transport settings.

The Link header with rel="next" signals cursor-based pagination: the current response is one page, and further networks remain. The developer must request the URL given in that header to retrieve the next page, satisfying the constraint of listing all networks rather than only the first batch.

The request payload must carry the actual content to deliver, supplied as the message field in JSON, formatted as plain text or markdown. This satisfies the stem's requirement for the message content itself, distinct from routing and authentication data.

The Meraki Dashboard API requires the API key to be passed in the X-Cisco-Meraki-API-Key header. Without this header, the API returns 401 Unauthorized even if the key itself is valid. Including this header with the correct key is the standard authentication method for all Meraki Dashboard API v1 endpoints.

Run your network is one of the four documented Cisco DNA Center API categories, grouping endpoints for command runner, network health, and troubleshooting operations. It is a distinct category from Know your network, Platform, and Manage your network, satisfying the question's requirement.

Cisco DNA Center issues tokens via POST to /dna/system/api/v1/auth/token, authenticating with an HTTP Basic header containing the base64-encoded username and password. The response returns a token used as an X-Auth-Token header for subsequent API calls.

This request retrieves the list of networks within the specified organization. The organizationId is obtained from the previous call. The response includes network details such as ID, name, and type. This is the correct endpoint to list networks for an organization in the Meraki Dashboard API.

HTTP 429 signals rate limiting, and the Meraki Dashboard API returns a Retry-After header specifying the exact wait interval. Honouring that value prevents further throttling and failed calls, satisfying the stem's requirement to handle the response appropriately rather than retrying immediately.

Meraki returns the next-page URL in the HTTP Link header, following RFC 5988, so the developer reads it directly rather than constructing offsets. This satisfies the pagination constraint: the response supplies the exact next-page endpoint, avoiding manual page-number arithmetic or cursor guessing.

Cisco DNA Center's Intent API requires obtaining a token by posting to /dna/system/api/v1/auth/token with Basic authentication. The response contains a token that must be included in the X-Auth-Token header for subsequent calls. This is the documented authentication flow for DNA Center.

The network ID is required in the URL to identify the network.

The /dna/intent/api/v1/issues endpoint is the Intent API resource dedicated to network issue retrieval, returning the current list of issues detected by DNA Center's assurance engine. It satisfies the stem's requirement for a list of current network issues rather than device or health data.

Cisco DNA Center exposes a REST API whose intent and assurance endpoints return network health and issue data, letting you retrieve a list of problems affecting the network. It is the platform built for this assurance function, unlike Meraki or SD-WAN Manager.

The Meraki Dashboard API uses GET /api/v1/organizations to list all organizations accessible by the API key. This endpoint returns an array of organization objects with id and name. The API key is passed in the X-Cisco-Meraki-API-Key header. This is the correct method and path for retrieving organizations.

RESTCONF exposes YANG-modelled data beneath /restconf/data, followed by the module-qualified path. Cisco-IOS-XE-native:native is the module and container, and hostname is the leaf within it, so this URI returns the device hostname via a GET request.

The NX-API distinguishes between commands that return structured JSON output and those that return ASCII text. The 'show running-config' command does not have a JSON schema, so it must be requested with type 'cli_show_ascii'. Using 'cli_show' expects structured output and fails for this command. Thus, the developer must change the type.

When a new room is successfully created via POST /v1/rooms, the Webex API returns HTTP 201 Created. The response body is a JSON object representing the room, including an 'id' field that uniquely identifies the room. This ID is then used in the membership endpoint.

This endpoint returns the list of networks within the specified organization. The organization ID is included in the path, and the API key is passed in the X-Cisco-Meraki-API-Key header. The response is a JSON array of network objects. This is the correct way to retrieve networks for an organization.

Cursor-based pagination in the Meraki Dashboard API uses the startingAfter and endingBefore parameters, which reference a record's identifier to fetch the next or previous page. This satisfies the stem's requirement for cursor-based paging rather than page-number or offset approaches.

The Meraki Dashboard API requires the API key in a custom HTTP header named X-Cisco-Meraki-API-Key. This header must be included in every request for authentication. The key is generated in the Meraki Dashboard under Organization > Settings. Using this header allows the API to identify the organization and authorize the action, such as creating a network.

The Retry-After header tells the client how many seconds to wait before retrying, directly addressing rate limiting signalled by HTTP 429. Reading it prevents repeated rejected calls and satisfies the requirement to determine the correct retry timing.

The Client Credentials grant allows an application to authenticate using only its client ID and client secret, without any user interaction. This is exactly the scenario described: an unattended service account that needs to call Webex APIs programmatically. It is the standard OAuth 2.0 mechanism for machine-to-machine authentication.

Correct. OpenConfig's interface model is oc-interfaces (openconfig-interfaces).

The `openconfig-interfaces` module directly satisfies the stem's requirement for an OpenConfig interface configuration model. Unlike IETF or vendor-native YANG modules, OpenConfig models use a vendor-neutral schema, so this module configures interfaces consistently across multi-vendor devices via NETCONF or RESTCONF.

RESTCONF exposes IOS XE configuration through the Cisco-IOS-XE-native YANG model, so the hostname leaf sits under the native container. The GET request targets that data path, satisfying the requirement to retrieve the device hostname via RESTCONF.

pyang parses YANG modules, validates their syntax and semantics against RFC rules, and can render tree diagrams, making it the standard tool for exploring and validating YANG models. It directly satisfies the requirement to check model correctness.

The YANG module Cisco-IOS-XE-native models native IOS XE configuration, and its hostname leaf sits under the native container. RESTCONF addresses data nodes as /restconf/data/{module}:{container}/{leaf}, so this path retrieves the hostname directly, satisfying the requirement to read that value over RESTCONF.

NX-API accepts CLI commands wrapped in JSON via HTTP POST, since the command payload is submitted in the request body. GET cannot carry a body reliably, so POST is the method used to send show or configuration commands to the NX-OS device.

NX-API's 'cli' method accepts JSON-encoded requests over HTTP/HTTPS, converting them into CLI commands executed on the device. Crucially, it requires no extra feature enablement beyond the NX-API infrastructure itself, satisfying the stem's constraint of sending CLI commands in JSON format without enabling additional features.

pyang is a YANG data modeling tool.

Webex webhooks subscribe to a resource and event pair. 'messages' with 'created' fires when a new message is posted, matching the stem's requirement. Subscribing to 'rooms' or 'updated' events would not trigger on new messages in rooms the bot belongs to.

The `action 1.0 cli command` statement runs an EXEC-mode CLI command when the applet's event fires, satisfying the requirement to execute a command on trigger. The `cli` keyword specifies the action type, while `command` supplies the exact string to run, distinguishing it from other actions such as `syslog` or `reload`.

This snippet retrieves the token from the environment variable and constructs the correct 'Bearer <token>' string for the Authorization header. The Webex Teams API requires this exact header format for authentication. Using os.environ ensures the token is not hard-coded, which is a security best practice. The concatenation is valid because os.environ returns a string.

POST /v1/messages accepts a roomId body parameter, which targets a specific Webex room directly rather than resolving a recipient email or person ID. This satisfies the stem's requirement to address a room destination, since roomId uniquely identifies that space within the Webex messaging API.

The syslog action within an EEM applet emits a custom message to the logging facility. Specifying action 1.0 syslog msg with the text string generates the custom syslog output when the applet's pattern match triggers.

The DNA Center topology API exposes layer 2 topology per VLAN through the intent path with the vlanID path parameter, returning nodes and links for that broadcast domain. This satisfies the stem's requirement to retrieve Layer 2 topology scoped to a specific VLAN.

A webhook requires a reachable HTTPS target URL, because Webex POSTs each event payload to that endpoint rather than the app polling. Supplying it satisfies the real-time notification requirement, since without a registered target the subscription cannot deliver anything.

The command 'feature nxapi' enables the NX-API feature on Cisco NX-OS devices. Without this command, the device does not listen for HTTP/HTTPS API requests. This is the correct and required configuration step to allow programmatic access via the NX-API.