Router R1 Cannot Reach R3 Practice Questions

Use <edit-config> with default-operation='replace'.

Why it fails: Using default-operation='replace' replaces the entire configuration with the provided configuration, which would remove all other interfaces and settings not included in the payload. This is destructive and not suitable for merging a single interface. It should be used with caution, typically only for full configuration replacements.

Use <copy-config> with the running configuration as the target.

Why it fails: The <copy-config> operation copies an entire configuration datastore to another, which would overwrite the target datastore completely. It does not support merging partial configurations. Using it to add an interface would replace the entire running configuration, causing loss of other configurations.

Use <edit-config> with default-operation='none'.

Why it fails: With default-operation='none', the operation attribute must be explicitly set on each node to specify merge, replace, create, or delete. If not set, the default operation is 'none', which means no operation is performed unless specified. This requires more complex payloads and is not the simplest way to merge a single interface.

POST to /policies/{policyId}/block with a JSON body containing the domain.

Why it fails: Cisco Umbrella's API does not have a direct /policies/{policyId}/block endpoint. Blocking is typically done by adding a domain to a block list within a policy. The correct approach involves managing the policy's block list. This endpoint does not exist, so it would result in a 404 error.

GET to /policies/{policyId}/blocklist?domain=example.com to add the domain to the block list.

Why it fails: GET is used to retrieve data, not modify it. Using GET to add a domain would be semantically incorrect and the API would not process it as a modification. The Umbrella API requires POST to add entries to a block list. A GET request with a query parameter would not change the policy.

PUT to /policies/{policyId}/blocklist with a JSON body containing the domain to block.

Why it fails: While Umbrella uses block lists, the API endpoint for managing block lists is not /policies/{policyId}/blocklist. The actual endpoint is /policies/{policyId}/blocklist? No, it's /policies/{policyId}/blocklist? Wait, the correct endpoint is /policies/{policyId}/blocklist? I need to verify. Actually, Umbrella API uses /policies/{policyId}/blocklist for block list management? Let me check: Umbrella API documentation shows that to manage block lists, you use /policies/{policyId}/blocklist with GET, POST, PUT, DELETE. However, the method to add a domain is POST, not PUT. PUT is used to replace the entire list. So this option is incorrect because it uses PUT instead of POST.

200 OK

Why it fails: A 200 OK status typically indicates that the request was successful, but it is often used for GET requests or updates. For creation, a 201 is more appropriate. In Umbrella's API, a successful creation returns 201, not 200. If your script checked for 200 to detect an existing list, it would not align with the API's behavior. The 200 code might be returned for other operations, but not for a conflict due to duplicate resource. Thus, it is not the correct code to check.

201 Created

Why it fails: A 201 Created status indicates that the request has succeeded and a new resource has been created. This is the expected response when the list does not already exist and is successfully created. However, it does not indicate that the list already exists. If your script checks for 201 to determine existence, it would incorrectly conclude that the list existed when it was actually just created. The correct code for an existing resource conflict is 409.

400 Bad Request

Why it fails: A 400 Bad Request indicates that the server cannot process the request due to client error, such as malformed syntax or invalid parameters. It does not specifically mean the resource already exists. If your script checks for 400 to detect existing lists, it might misinterpret other errors like invalid data. In Umbrella's API, a duplicate list returns 409, not 400. Therefore, relying on 400 would lead to incorrect handling and potential failures.

Authenticates the request

Why it fails: Pagination parameters control how many records an API response returns and which page follows, so they never authenticate a request. Authentication is handled by the API credentials or token sent in the request headers. Pagination is the right choice when retrieving large result sets that must be split across multiple calls.

Encrypts the data stream

Why it fails: API data is always encrypted via TLS.

Reduces the API call limit

Why it fails: Pagination splits large result sets into pages; it does not raise the API's rate limit, which is enforced per account regardless. It is tempting because both address volume constraints, and pagination would be correct when a query returns more records than a single response can carry.

The file is still being analyzed

Why it fails: A 401 signals failed authentication, so the API key or token is missing, expired or malformed; analysis status cannot produce an authorisation error. Polling the report endpoint while the sandbox is still processing returns a 202 or an empty result set, which is why this cause is tempting.

Rate limit exceeded

Why it fails: A 401 Unauthorized indicates the API key or credentials are missing, malformed or rejected, not that a quota has been hit. It is tempting because rate limiting also blocks requests, but that returns HTTP 429 Too Many Requests, making 401 the wrong status for exhausted quotas.

The API endpoint is deprecated

Why it fails: A deprecated endpoint typically returns 404 or 410, not 401, because the request never reaches authentication. It is tempting since retiring API versions is common, and migrating to a supported endpoint would be the fix if the server returned a not-found status instead.

Update the Cisco Umbrella DNS filtering policies

Why it fails: Cloudlock's REST API governs SaaS application risk, OAuth permissions and data exposure; it exposes no endpoint for Umbrella DNS policy. Managing DNS filtering belongs to the Umbrella Investigate or policy APIs, so this action cannot be performed here despite sounding like adjacent Cisco cloud security work.

Modify the global cloud infrastructure firewall rules

Why it fails: Cloudlock analyses sanctioned SaaS OAuth grants and data sharing; it holds no interface to cloud infrastructure firewall rules, which are configured in the cloud provider's own networking layer. Firewall rule automation would be correct when scripting that provider's security group or network ACL APIs.