Question 930
After Bluebird Infrastructure deploys Terraform plan before apply to review configuration impact before making a broad service-provider change, the primary acceptance check passes (the reviewed plan enumerates proposed create update and delete operations). What remaining operational risk should still be part of the design review?
- Module coverage and network access permissions vary by router OS.
- External drift can invalidate an earlier saved plan.
- Operational cutover must preserve critical fault monitoring continuity.
- Ownership voucher trust anchors must remain current and protected.
Explanation
Correct Answer
B:The relevant boundary of Terraform plan before apply is that external drift can invalidate an earlier saved plan. Passing the acceptance test does not eliminate this residual operational risk.
Incorrect Answers
A:This concern applies to Ansible declarative desired configuration in a different scenario where operators need to apply a repeated standardized configuration across a provider router fleet. For the deployed Terraform plan before apply approach, the relevant caution is instead that external drift can invalidate an earlier saved plan.
C: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 Terraform plan before apply approach, the relevant caution is instead that external drift can invalidate an earlier saved plan.
D:This concern applies to secure ZTP device identity validation in a different scenario where operators need to onboard an unconfigured provider router across an untrusted initial management network. For the deployed Terraform plan before apply approach, the relevant caution is instead that external drift can invalidate an earlier saved plan.
Question 931
Horizon Exchange must onboard an unconfigured provider router across an untrusted initial management network. The operator is comparing several service-provider methods. Which design or control directly addresses that stated requirement?
- secure ZTP server authenticity
- API bearer token scope
- secure ZTP device identity validation
- NSO service model intent mapping
Explanation
Correct Answer
C:secure ZTP device identity validation matches this requirement: the team should validate the router's manufacturer identity and permitted ownership voucher. A relevant outcome would be that only an authenticated owned router accepts the intended onboarding process.
Incorrect Answers
A:secure ZTP server authenticity instead addresses a different condition: prevent a newly booted router from accepting malicious provisioning instructions. It would instead require you to verify the bootstrap server and signed onboarding data before configuration, not the stated goal to onboard an unconfigured provider router across an untrusted initial management network.
B:API bearer token scope instead addresses a different condition: authenticate a network automation script without embedding broad shared passwords. It would instead require you to supply a scoped bearer token over TLS and restrict access to required endpoints, not the stated goal to onboard an unconfigured provider router across an untrusted initial management network.
D:NSO service model intent mapping instead addresses a different condition: deploy a repeatable multi-router service from a single declarative service request. It would instead require you to create an NSO service model with mapping logic to device-specific configuration, not the stated goal to onboard an unconfigured provider router across an untrusted initial management network.
Question 932
At Cedar Wireless, the engineering change is approved for secure ZTP device identity validation. The specific goal is to onboard an unconfigured provider router across an untrusted initial management network. Which implementation step belongs in this change plan?
- Verify the bootstrap server and signed onboarding data before configuration.
- Supply a scoped bearer token over TLS and restrict access to required endpoints.
- Create an NSO service model with mapping logic to device-specific configuration.
- Validate the router's manufacturer identity and permitted ownership voucher.
Explanation
Correct Answer
D:Implementing secure ZTP device identity validation requires the operator to validate the router's manufacturer identity and permitted ownership voucher. This makes the required goal testable using evidence that only an authenticated owned router accepts the intended onboarding process.
Incorrect Answers
A:The proposed step is for secure ZTP server authenticity, whose purpose is to prevent a newly booted router from accepting malicious provisioning instructions. It would not perform the necessary secure ZTP device identity validation operation: validate the router's manufacturer identity and permitted ownership voucher.
B:The proposed step is for API bearer token scope, whose purpose is to authenticate a network automation script without embedding broad shared passwords. It would not perform the necessary secure ZTP device identity validation operation: validate the router's manufacturer identity and permitted ownership voucher.
C:The proposed step is for NSO service model intent mapping, whose purpose is to deploy a repeatable multi-router service from a single declarative service request. It would not perform the necessary secure ZTP device identity validation operation: validate the router's manufacturer identity and permitted ownership voucher.
Question 933
Willow Regional has deployed secure ZTP device identity validation to onboard an unconfigured provider router across an untrusted initial management network. The implementation step was to validate the router's manufacturer identity and permitted ownership voucher. Which observation demonstrates that the requested service is working?
- Only an authenticated owned router accepts the intended onboarding process.
- A router rejects untrusted provisioning artifacts and accepts valid owner data.
- Authorized operations succeed while unrelated administrative calls are denied.
- One service instance produces consistent intended changes on affected devices.
Explanation
Correct Answer
A:For secure ZTP device identity validation, successful verification means that only an authenticated owned router accepts the intended onboarding process. That evidence directly tests whether the provider can onboard an unconfigured provider router across an untrusted initial management network after deployment.
Incorrect Answers
B:The observation would verify secure ZTP server authenticity under the separate requirement to prevent a newly booted router from accepting malicious provisioning instructions. It does not demonstrate the needed secure ZTP device identity validation result: only an authenticated owned router accepts the intended onboarding process.
C:The observation would verify API bearer token scope under the separate requirement to authenticate a network automation script without embedding broad shared passwords. It does not demonstrate the needed secure ZTP device identity validation result: only an authenticated owned router accepts the intended onboarding process.
D:The observation would verify NSO service model intent mapping under the separate requirement to deploy a repeatable multi-router service from a single declarative service request. It does not demonstrate the needed secure ZTP device identity validation result: only an authenticated owned router accepts the intended onboarding process.
Question 934
While troubleshooting secure ZTP device identity validation at Atlas Backbone, the intended acceptance outcome is still missing: only an authenticated owned router accepts the intended onboarding process. Which fault condition should be investigated first for this particular design?
- An unsigned file from a rogue DHCP source is treated as trusted configuration.
- Any device claiming the target IP address is blindly granted bootstrap credentials.
- The token is exposed in query parameters or committed source files.
- Operators hand-edit each device and lose the service-to-device state relationship.
Explanation
Correct Answer
B:The suspected defect directly frustrates secure ZTP device identity validation: any device claiming the target IP address is blindly granted bootstrap credentials. Correcting it should allow verification that only an authenticated owned router accepts the intended onboarding process.
Incorrect Answers
A:This defect belongs to secure ZTP server authenticity, where the affected outcome is to prevent a newly booted router from accepting malicious provisioning instructions. It is not the direct failure mode identified for the secure ZTP device identity validation design in this case: any device claiming the target IP address is blindly granted bootstrap credentials.
C:This defect belongs to API bearer token scope, where the affected outcome is to authenticate a network automation script without embedding broad shared passwords. It is not the direct failure mode identified for the secure ZTP device identity validation design in this case: any device claiming the target IP address is blindly granted bootstrap credentials.
D:This defect belongs to NSO service model intent mapping, where the affected outcome is to deploy a repeatable multi-router service from a single declarative service request. It is not the direct failure mode identified for the secure ZTP device identity validation design in this case: any device claiming the target IP address is blindly granted bootstrap credentials.
Question 935
After Starlight IP Services deploys secure ZTP device identity validation to onboard an unconfigured provider router across an untrusted initial management network, the primary acceptance check passes (only an authenticated owned router accepts the intended onboarding process). What remaining operational risk should still be part of the design review?
- Certificate revocation and bootstrap reachability must be planned.
- Token expiration and rotation must be handled without weakening auditability.
- Ownership voucher trust anchors must remain current and protected.
- Accurate service model and device NED support are prerequisites.
Explanation
Correct Answer
C:The relevant boundary of secure ZTP device identity validation is that ownership voucher trust anchors must remain current and protected. Passing the acceptance test does not eliminate this residual operational risk.
Incorrect Answers
A:This concern applies to secure ZTP server authenticity in a different scenario where operators need to prevent a newly booted router from accepting malicious provisioning instructions. For the deployed secure ZTP device identity validation approach, the relevant caution is instead that ownership voucher trust anchors must remain current and protected.
B:This concern applies to API bearer token scope in a different scenario where operators need to authenticate a network automation script without embedding broad shared passwords. For the deployed secure ZTP device identity validation approach, the relevant caution is instead that ownership voucher trust anchors must remain current and protected.
D:This concern applies to NSO service model intent mapping in a different scenario where operators need to deploy a repeatable multi-router service from a single declarative service request. For the deployed secure ZTP device identity validation approach, the relevant caution is instead that ownership voucher trust anchors must remain current and protected.
Question 936
Northstar Carrier must prevent a newly booted router from accepting malicious provisioning instructions. The operator is comparing several service-provider methods. Which design or control directly addresses that stated requirement?
- secure ZTP device identity validation
- RESTCONF management endpoint selection
- gNMI ON_CHANGE subscription
- secure ZTP server authenticity
Explanation
Correct Answer
D:secure ZTP server authenticity matches this requirement: the team should verify the bootstrap server and signed onboarding data before configuration. A relevant outcome would be that a router rejects untrusted provisioning artifacts and accepts valid owner data.
Incorrect Answers
A:secure ZTP device identity validation instead addresses a different condition: onboard an unconfigured provider router across an untrusted initial management network. It would instead require you to validate the router's manufacturer identity and permitted ownership voucher, not the stated goal to prevent a newly booted router from accepting malicious provisioning instructions.
B: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 prevent a newly booted router from accepting malicious provisioning instructions.
C:gNMI ON_CHANGE subscription instead addresses a different condition: receive notifications only when eligible operational state leaves change. It would instead require you to configure ON_CHANGE for supported state paths rather than fixed polling, not the stated goal to prevent a newly booted router from accepting malicious provisioning instructions.
Question 937
At Orion Transit, the engineering change is approved for secure ZTP server authenticity. The specific goal is to prevent a newly booted router from accepting malicious provisioning instructions. Which implementation step belongs in this change plan?
- Verify the bootstrap server and signed onboarding data before configuration.
- Validate the router's manufacturer identity and permitted ownership voucher.
- Enable supported RESTCONF and query the intended data resource over TLS.
- Configure ON_CHANGE for supported state paths rather than fixed polling.
Explanation
Correct Answer
A:Implementing secure ZTP server authenticity requires the operator to verify the bootstrap server and signed onboarding data before configuration. This makes the required goal testable using evidence that a router rejects untrusted provisioning artifacts and accepts valid owner data.
Incorrect Answers
B:The proposed step is for secure ZTP device identity validation, whose purpose is to onboard an unconfigured provider router across an untrusted initial management network. It would not perform the necessary secure ZTP server authenticity operation: verify the bootstrap server and signed onboarding data before configuration.
C: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 secure ZTP server authenticity operation: verify the bootstrap server and signed onboarding data before configuration.
D:The proposed step is for gNMI ON_CHANGE subscription, whose purpose is to receive notifications only when eligible operational state leaves change. It would not perform the necessary secure ZTP server authenticity operation: verify the bootstrap server and signed onboarding data before configuration.
Question 938
Meridian Networks has deployed secure ZTP server authenticity to prevent a newly booted router from accepting malicious provisioning instructions. The implementation step was to verify the bootstrap server and signed onboarding data before configuration. Which observation demonstrates that the requested service is working?
- Only an authenticated owned router accepts the intended onboarding process.
- A router rejects untrusted provisioning artifacts and accepts valid owner data.
- The API returns the expected structured configuration with a successful HTTP status.
- The collector gets an event when the operational leaf changes.
Explanation
Correct Answer
B:For secure ZTP server authenticity, successful verification means that a router rejects untrusted provisioning artifacts and accepts valid owner data. That evidence directly tests whether the provider can prevent a newly booted router from accepting malicious provisioning instructions after deployment.
Incorrect Answers
A:The observation would verify secure ZTP device identity validation under the separate requirement to onboard an unconfigured provider router across an untrusted initial management network. It does not demonstrate the needed secure ZTP server authenticity result: a router rejects untrusted provisioning artifacts and accepts valid owner data.
C: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 secure ZTP server authenticity result: a router rejects untrusted provisioning artifacts and accepts valid owner data.
D:The observation would verify gNMI ON_CHANGE subscription under the separate requirement to receive notifications only when eligible operational state leaves change. It does not demonstrate the needed secure ZTP server authenticity result: a router rejects untrusted provisioning artifacts and accepts valid owner data.
Question 939
While troubleshooting secure ZTP server authenticity at Kestrel Broadband, the intended acceptance outcome is still missing: a router rejects untrusted provisioning artifacts and accepts valid owner data. Which fault condition should be investigated first for this particular design?
- Any device claiming the target IP address is blindly granted bootstrap credentials.
- The client sends an unauthenticated HTTP request to a disabled RESTCONF endpoint.
- An unsigned file from a rogue DHCP source is treated as trusted configuration.
- SAMPLE polling is treated as proof the update was event-triggered.
Explanation
Correct Answer
C:The suspected defect directly frustrates secure ZTP server authenticity: an unsigned file from a rogue DHCP source is treated as trusted configuration. Correcting it should allow verification that a router rejects untrusted provisioning artifacts and accepts valid owner data.
Incorrect Answers
A:This defect belongs to secure ZTP device identity validation, where the affected outcome is to onboard an unconfigured provider router across an untrusted initial management network. It is not the direct failure mode identified for the secure ZTP server authenticity design in this case: an unsigned file from a rogue DHCP source is treated as trusted configuration.
B: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 secure ZTP server authenticity design in this case: an unsigned file from a rogue DHCP source is treated as trusted configuration.
D:This defect belongs to gNMI ON_CHANGE subscription, where the affected outcome is to receive notifications only when eligible operational state leaves change. It is not the direct failure mode identified for the secure ZTP server authenticity design in this case: an unsigned file from a rogue DHCP source is treated as trusted configuration.
Question 940
After Harbor Metro deploys secure ZTP server authenticity to prevent a newly booted router from accepting malicious provisioning instructions, the primary acceptance check passes (a router rejects untrusted provisioning artifacts and accepts valid owner data). What remaining operational risk should still be part of the design review?
- Ownership voucher trust anchors must remain current and protected.
- RESTCONF data models and URI paths must match platform implementation.
- Not every model path supports ON_CHANGE semantics.
- Certificate revocation and bootstrap reachability must be planned.
Explanation
Correct Answer
D:The relevant boundary of secure ZTP server authenticity is that certificate revocation and bootstrap reachability must be planned. Passing the acceptance test does not eliminate this residual operational risk.
Incorrect Answers
A:This concern applies to secure ZTP device identity validation in a different scenario where operators need to onboard an unconfigured provider router across an untrusted initial management network. For the deployed secure ZTP server authenticity approach, the relevant caution is instead that certificate revocation and bootstrap reachability must be planned.
B: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 secure ZTP server authenticity approach, the relevant caution is instead that certificate revocation and bootstrap reachability must be planned.
C:This concern applies to gNMI ON_CHANGE subscription in a different scenario where operators need to receive notifications only when eligible operational state leaves change. For the deployed secure ZTP server authenticity approach, the relevant caution is instead that certificate revocation and bootstrap reachability must be planned.
Implementing and Operating Cisco Service Provider Network Core Technologies (SPCOR) (350-501) Practice Tests