Question 850
After Harbor Metro deploys weighted random early detection to avoid persistent tail-drop synchronization in a congested packet queue, the primary acceptance check passes (drop probability rises before queue exhaustion while sensitive classes remain prioritized). What remaining operational risk should still be part of the design review?
- Excess offered load can still cause queue delay or eventual buffer drops.
- Incorrect WRED thresholds may penalize important traffic before congestion is severe.
- Maintenance domain levels must be consistent between participants.
- PE loopbacks and MPLS transport must be reachable independent of VPN routes.
Explanation
Correct Answer
B:The relevant boundary of weighted random early detection is that incorrect WRED thresholds may penalize important traffic before congestion is severe. Passing the acceptance test does not eliminate this residual operational risk.
Incorrect Answers
A:This concern applies to traffic shaping smoothing in a different scenario where operators need to smooth an egress stream to a slower contracted handoff rather than dropping every burst. For the deployed weighted random early detection approach, the relevant caution is instead that incorrect WRED thresholds may penalize important traffic before congestion is severe.
C:This concern applies to Ethernet CFM continuity check in a different scenario where operators need to detect loss of Ethernet service connectivity between provider maintenance endpoints. For the deployed weighted random early detection approach, the relevant caution is instead that incorrect WRED thresholds may penalize important traffic before congestion is severe.
D:This concern applies to MP-BGP vpnv4 peering in a different scenario where operators need to exchange labeled VPN-IPv4 reachability among provider PEs. For the deployed weighted random early detection approach, the relevant caution is instead that incorrect WRED thresholds may penalize important traffic before congestion is severe.
Question 851
Summit Service Provider must read YANG-modeled configuration from a device using an authenticated HTTPS client. The operator is comparing several service-provider methods. Which design or control directly addresses that stated requirement?
- gNMI streaming subscription
- SNMP community versus user model
- RESTCONF management endpoint selection
- API POST creation workflow
Explanation
Correct Answer
C:RESTCONF management endpoint selection matches this requirement: the team should enable supported RESTCONF and query the intended data resource over TLS. A relevant outcome would be that the API returns the expected structured configuration with a successful HTTP status.
Incorrect Answers
A:gNMI streaming subscription instead addresses a different condition: collect continuously updated interface telemetry from a router without repeated shell polling. It would instead require you to subscribe to the supported gNMI model path using an authenticated gRPC session, not the stated goal to read YANG-modeled configuration from a device using an authenticated HTTPS client.
B:SNMP community versus user model instead addresses a different condition: remove shared plaintext-community access from a sensitive provider management network. It would instead require you to migrate monitoring to per-user SNMPv3 authentication and appropriate views, not the stated goal to read YANG-modeled configuration from a device using an authenticated HTTPS client.
D:API POST creation workflow instead addresses a different condition: create a service resource using the documented REST API method. It would instead require you to send a validated POST payload with correct media type and authorization, not the stated goal to read YANG-modeled configuration from a device using an authenticated HTTPS client.
Question 852
At Ridgeway Networks, the engineering change is approved for RESTCONF management endpoint selection. The specific goal is to read YANG-modeled configuration from a device using an authenticated HTTPS client. Which implementation step belongs in this change plan?
- Subscribe to the supported gNMI model path using an authenticated gRPC session.
- Migrate monitoring to per-user SNMPv3 authentication and appropriate views.
- Send a validated POST payload with correct media type and authorization.
- Enable supported RESTCONF and query the intended data resource over TLS.
Explanation
Correct Answer
D:Implementing RESTCONF management endpoint selection requires the operator to enable supported RESTCONF and query the intended data resource over TLS. This makes the required goal testable using evidence that the API returns the expected structured configuration with a successful HTTP status.
Incorrect Answers
A:The proposed step is for gNMI streaming subscription, whose purpose is to collect continuously updated interface telemetry from a router without repeated shell polling. It would not perform the necessary RESTCONF management endpoint selection operation: enable supported RESTCONF and query the intended data resource over TLS.
B:The proposed step is for SNMP community versus user model, whose purpose is to remove shared plaintext-community access from a sensitive provider management network. It would not perform the necessary RESTCONF management endpoint selection operation: enable supported RESTCONF and query the intended data resource over TLS.
C:The proposed step is for API POST creation workflow, whose purpose is to create a service resource using the documented REST API method. It would not perform the necessary RESTCONF management endpoint selection operation: enable supported RESTCONF and query the intended data resource over TLS.
Question 853
Lakeside Transport has deployed RESTCONF management endpoint selection to read YANG-modeled configuration from a device using an authenticated HTTPS client. The implementation step was to enable supported RESTCONF and query the intended data resource over TLS. Which observation demonstrates that the requested service is working?
- The API returns the expected structured configuration with a successful HTTP status.
- The collector receives matching sampled or event-driven updates for the requested path.
- Each NMS identity has individually limited and auditable access.
- The API returns the documented creation status and resource identity.
Explanation
Correct Answer
A:For RESTCONF management endpoint selection, successful verification means that the API returns the expected structured configuration with a successful HTTP status. That evidence directly tests whether the provider can read YANG-modeled configuration from a device using an authenticated HTTPS client after deployment.
Incorrect Answers
B:The observation would verify gNMI streaming subscription under the separate requirement to collect continuously updated interface telemetry from a router without repeated shell polling. It does not demonstrate the needed RESTCONF management endpoint selection result: the API returns the expected structured configuration with a successful HTTP status.
C:The observation would verify SNMP community versus user model under the separate requirement to remove shared plaintext-community access from a sensitive provider management network. It does not demonstrate the needed RESTCONF management endpoint selection result: the API returns the expected structured configuration with a successful HTTP status.
D:The observation would verify API POST creation workflow under the separate requirement to create a service resource using the documented REST API method. It does not demonstrate the needed RESTCONF management endpoint selection result: the API returns the expected structured configuration with a successful HTTP status.
Question 854
While troubleshooting RESTCONF management endpoint selection at Coastal Communications, the intended acceptance outcome is still missing: the API returns the expected structured configuration with a successful HTTP status. Which fault condition should be investigated first for this particular design?
- A one-time configuration RPC is mistaken for a continuing telemetry subscription.
- The client sends an unauthenticated HTTP request to a disabled RESTCONF endpoint.
- All monitoring stations continue to share one community string as the only control.
- A GET request is sent expecting it to create a new network object.
Explanation
Correct Answer
B:The suspected defect directly frustrates RESTCONF management endpoint selection: the client sends an unauthenticated HTTP request to a disabled RESTCONF endpoint. Correcting it should allow verification that the API returns the expected structured configuration with a successful HTTP status.
Incorrect Answers
A:This defect belongs to gNMI streaming subscription, where the affected outcome is to collect continuously updated interface telemetry from a router without repeated shell polling. It is not the direct failure mode identified for the RESTCONF management endpoint selection design in this case: the client sends an unauthenticated HTTP request to a disabled RESTCONF endpoint.
C:This defect belongs to SNMP community versus user model, where the affected outcome is to remove shared plaintext-community access from a sensitive provider management network. It is not the direct failure mode identified for the RESTCONF management endpoint selection design in this case: the client sends an unauthenticated HTTP request to a disabled RESTCONF endpoint.
D:This defect belongs to API POST creation workflow, where the affected outcome is to create a service resource using the documented REST API method. It is not the direct failure mode identified for the RESTCONF management endpoint selection design in this case: the client sends an unauthenticated HTTP request to a disabled RESTCONF endpoint.
Question 855
After Bluebird Infrastructure deploys RESTCONF management endpoint selection to read YANG-modeled configuration from a device using an authenticated HTTPS client, the primary acceptance check passes (the API returns the expected structured configuration with a successful HTTP status). What remaining operational risk should still be part of the design review?
- Subscription cadence and available paths depend on target implementation.
- Operational cutover must preserve critical fault monitoring continuity.
- RESTCONF data models and URI paths must match platform implementation.
- Repeating a nonidempotent POST can create unintended duplicate objects.
Explanation
Correct Answer
C:The relevant boundary of RESTCONF management endpoint selection is that RESTCONF data models and URI paths must match platform implementation. Passing the acceptance test does not eliminate this residual operational risk.
Incorrect Answers
A:This concern applies to gNMI streaming subscription in a different scenario where operators need to collect continuously updated interface telemetry from a router without repeated shell polling. For the deployed RESTCONF management endpoint selection approach, the relevant caution is instead that RESTCONF data models and URI paths must match platform implementation.
B:This concern applies to SNMP community versus user model in a different scenario where operators need to remove shared plaintext-community access from a sensitive provider management network. For the deployed RESTCONF management endpoint selection approach, the relevant caution is instead that RESTCONF data models and URI paths must match platform implementation.
D:This concern applies to API POST creation workflow in a different scenario where operators need to create a service resource using the documented REST API method. For the deployed RESTCONF management endpoint selection approach, the relevant caution is instead that RESTCONF data models and URI paths must match platform implementation.
Question 856
Horizon Exchange must perform a structured configuration edit with a NETCONF-capable routing device. The operator is comparing several service-provider methods. Which design or control directly addresses that stated requirement?
- RESTCONF management endpoint selection
- Python GET response handling
- RESTCONF PATCH partial update
- NETCONF transactional configuration
Explanation
Correct Answer
D:NETCONF transactional configuration matches this requirement: the team should connect over the supported secure NETCONF transport and use the appropriate edit-config operation. A relevant outcome would be that the requested YANG-backed changes appear in the operational configuration after commit.
Incorrect Answers
A:RESTCONF management endpoint selection instead addresses a different condition: read YANG-modeled configuration from a device using an authenticated HTTPS client. It would instead require you to enable supported RESTCONF and query the intended data resource over TLS, not the stated goal to perform a structured configuration edit with a NETCONF-capable routing device.
B:Python GET response handling instead addresses a different condition: read router status via REST API without assuming every request succeeds. It would instead require you to issue a GET request with timeout and validate the HTTP response before parsing, not the stated goal to perform a structured configuration edit with a NETCONF-capable routing device.
C:RESTCONF PATCH partial update instead addresses a different condition: modify a particular YANG-modeled setting without replacing the entire resource. It would instead require you to use an appropriate supported RESTCONF PATCH or PUT operation with precise target path, not the stated goal to perform a structured configuration edit with a NETCONF-capable routing device.
Question 857
At Cedar Wireless, the engineering change is approved for NETCONF transactional configuration. The specific goal is to perform a structured configuration edit with a NETCONF-capable routing device. Which implementation step belongs in this change plan?
- Connect over the supported secure NETCONF transport and use the appropriate edit-config operation.
- Enable supported RESTCONF and query the intended data resource over TLS.
- Issue a GET request with timeout and validate the HTTP response before parsing.
- Use an appropriate supported RESTCONF PATCH or PUT operation with precise target path.
Explanation
Correct Answer
A:Implementing NETCONF transactional configuration requires the operator to connect over the supported secure NETCONF transport and use the appropriate edit-config operation. This makes the required goal testable using evidence that the requested YANG-backed changes appear in the operational configuration after commit.
Incorrect Answers
B:The proposed step is for RESTCONF management endpoint selection, whose purpose is to read YANG-modeled configuration from a device using an authenticated HTTPS client. It would not perform the necessary NETCONF transactional configuration operation: connect over the supported secure NETCONF transport and use the appropriate edit-config operation.
C:The proposed step is for Python GET response handling, whose purpose is to read router status via REST API without assuming every request succeeds. It would not perform the necessary NETCONF transactional configuration operation: connect over the supported secure NETCONF transport and use the appropriate edit-config operation.
D:The proposed step is for RESTCONF PATCH partial update, whose purpose is to modify a particular YANG-modeled setting without replacing the entire resource. It would not perform the necessary NETCONF transactional configuration operation: connect over the supported secure NETCONF transport and use the appropriate edit-config operation.
Question 858
Willow Regional has deployed NETCONF transactional configuration to perform a structured configuration edit with a NETCONF-capable routing device. The implementation step was to connect over the supported secure NETCONF transport and use the appropriate edit-config operation. Which observation demonstrates that the requested service is working?
- The API returns the expected structured configuration with a successful HTTP status.
- The requested YANG-backed changes appear in the operational configuration after commit.
- Successful responses yield expected fields while failures generate explicit errors.
- Only intended resource fields change and API response confirms success.
Explanation
Correct Answer
B:For NETCONF transactional configuration, successful verification means that the requested YANG-backed changes appear in the operational configuration after commit. That evidence directly tests whether the provider can perform a structured configuration edit with a NETCONF-capable routing device after deployment.
Incorrect Answers
A:The observation would verify RESTCONF management endpoint selection under the separate requirement to read YANG-modeled configuration from a device using an authenticated HTTPS client. It does not demonstrate the needed NETCONF transactional configuration result: the requested YANG-backed changes appear in the operational configuration after commit.
C:The observation would verify Python GET response handling under the separate requirement to read router status via REST API without assuming every request succeeds. It does not demonstrate the needed NETCONF transactional configuration result: the requested YANG-backed changes appear in the operational configuration after commit.
D:The observation would verify RESTCONF PATCH partial update under the separate requirement to modify a particular YANG-modeled setting without replacing the entire resource. It does not demonstrate the needed NETCONF transactional configuration result: the requested YANG-backed changes appear in the operational configuration after commit.
Question 859
While troubleshooting NETCONF transactional configuration at Atlas Backbone, the intended acceptance outcome is still missing: the requested YANG-backed changes appear in the operational configuration after commit. Which fault condition should be investigated first for this particular design?
- The client sends an unauthenticated HTTP request to a disabled RESTCONF endpoint.
- The script assumes success and indexes a nonexistent response body on HTTP failure.
- A RESTCONF GET call is used expecting to modify the candidate datastore.
- An unrestricted DELETE is used when a one-field update is needed.
Explanation
Correct Answer
C:The suspected defect directly frustrates NETCONF transactional configuration: a RESTCONF GET call is used expecting to modify the candidate datastore. Correcting it should allow verification that the requested YANG-backed changes appear in the operational configuration after commit.
Incorrect Answers
A:This defect belongs to RESTCONF management endpoint selection, where the affected outcome is to read YANG-modeled configuration from a device using an authenticated HTTPS client. It is not the direct failure mode identified for the NETCONF transactional configuration design in this case: a RESTCONF GET call is used expecting to modify the candidate datastore.
B:This defect belongs to Python GET response handling, where the affected outcome is to read router status via REST API without assuming every request succeeds. It is not the direct failure mode identified for the NETCONF transactional configuration design in this case: a RESTCONF GET call is used expecting to modify the candidate datastore.
D:This defect belongs to RESTCONF PATCH partial update, where the affected outcome is to modify a particular YANG-modeled setting without replacing the entire resource. It is not the direct failure mode identified for the NETCONF transactional configuration design in this case: a RESTCONF GET call is used expecting to modify the candidate datastore.
Question 860
After Starlight IP Services deploys NETCONF transactional configuration to perform a structured configuration edit with a NETCONF-capable routing device, the primary acceptance check passes (the requested YANG-backed changes appear in the operational configuration after commit). What remaining operational risk should still be part of the design review?
- RESTCONF data models and URI paths must match platform implementation.
- Retry policy must avoid flooding a degraded control-plane endpoint.
- RESTCONF PATCH support and media types vary by platform release.
- Candidate and running datastore support differ across router families.
Explanation
Correct Answer
D:The relevant boundary of NETCONF transactional configuration is that candidate and running datastore support differ across router families. Passing the acceptance test does not eliminate this residual operational risk.
Incorrect Answers
A:This concern applies to RESTCONF management endpoint selection in a different scenario where operators need to read YANG-modeled configuration from a device using an authenticated HTTPS client. For the deployed NETCONF transactional configuration approach, the relevant caution is instead that candidate and running datastore support differ across router families.
B:This concern applies to Python GET response handling in a different scenario where operators need to read router status via REST API without assuming every request succeeds. For the deployed NETCONF transactional configuration approach, the relevant caution is instead that candidate and running datastore support differ across router families.
C:This concern applies to RESTCONF PATCH partial update in a different scenario where operators need to modify a particular YANG-modeled setting without replacing the entire resource. For the deployed NETCONF transactional configuration approach, the relevant caution is instead that candidate and running datastore support differ across router families.
Implementing and Operating Cisco Service Provider Network Core Technologies (SPCOR) (350-501) Practice Tests