Question 50
After Harbor Metro deploys NFV network function migration to move a software network function between compatible compute hosts, the primary acceptance check passes (the function's network endpoints and state persist after the controlled migration). What remaining operational risk should still be part of the design review?
- Containers still share host-kernel failure and security boundaries.
- Host acceleration and stateful-flow continuity can restrict relocation.
- Too aggressive policing can suppress legitimate routing control packets.
- Each transit node must support the required SRv6 behavior and MTU.
Explanation
Correct Answer
B:The relevant boundary of NFV network function migration is that host acceleration and stateful-flow continuity can restrict relocation. Passing the acceptance test does not eliminate this residual operational risk.
Incorrect Answers
A:This concern applies to container isolation for tooling in a different scenario where operators need to run a small monitoring helper without deploying a full network-function virtual machine. For the deployed NFV network function migration approach, the relevant caution is instead that host acceleration and stateful-flow continuity can restrict relocation.
C:This concern applies to control-plane punt protection in a different scenario where operators need to limit exception traffic that can consume service-provider routing CPU. For the deployed NFV network function migration approach, the relevant caution is instead that host acceleration and stateful-flow continuity can restrict relocation.
D:This concern applies to SRv6 core path instruction in a different scenario where operators need to steer provider packets along an IPv6 segment list without MPLS label transport. For the deployed NFV network function migration approach, the relevant caution is instead that host acceleration and stateful-flow continuity can restrict relocation.
Question 51
Summit Service Provider must run a small monitoring helper without deploying a full network-function virtual machine. The operator is comparing several service-provider methods. Which design or control directly addresses that stated requirement?
- NFV network function migration
- MACsec provider handoff
- container isolation for tooling
- customer DSCP trust boundary
Explanation
Correct Answer
C:container isolation for tooling matches this requirement: the team should package the helper as a container with constrained network and filesystem privileges. A relevant outcome would be that the helper starts with only permitted access and the monitoring stream continues.
Incorrect Answers
A:NFV network function migration instead addresses a different condition: move a software network function between compatible compute hosts. It would instead require you to place the VNF on a supported NFV infrastructure with its service interfaces mapped, not the stated goal to run a small monitoring helper without deploying a full network-function virtual machine.
B:MACsec provider handoff instead addresses a different condition: encrypt traffic directly across supported Ethernet links between managed devices. It would instead require you to establish MACsec connectivity associations and key management on both handoff peers, not the stated goal to run a small monitoring helper without deploying a full network-function virtual machine.
D:customer DSCP trust boundary instead addresses a different condition: prevent a subscriber from assigning itself premium forwarding by arbitrary DSCP markings. It would instead require you to remark or police traffic at the subscriber-to-provider classification boundary, not the stated goal to run a small monitoring helper without deploying a full network-function virtual machine.
Question 52
At Ridgeway Networks, the engineering change is approved for container isolation for tooling. The specific goal is to run a small monitoring helper without deploying a full network-function virtual machine. Which implementation step belongs in this change plan?
- Place the VNF on a supported NFV infrastructure with its service interfaces mapped.
- Establish MACsec connectivity associations and key management on both handoff peers.
- Remark or police traffic at the subscriber-to-provider classification boundary.
- Package the helper as a container with constrained network and filesystem privileges.
Explanation
Correct Answer
D:Implementing container isolation for tooling requires the operator to package the helper as a container with constrained network and filesystem privileges. This makes the required goal testable using evidence that the helper starts with only permitted access and the monitoring stream continues.
Incorrect Answers
A:The proposed step is for NFV network function migration, whose purpose is to move a software network function between compatible compute hosts. It would not perform the necessary container isolation for tooling operation: package the helper as a container with constrained network and filesystem privileges.
B:The proposed step is for MACsec provider handoff, whose purpose is to encrypt traffic directly across supported Ethernet links between managed devices. It would not perform the necessary container isolation for tooling operation: package the helper as a container with constrained network and filesystem privileges.
C:The proposed step is for customer DSCP trust boundary, whose purpose is to prevent a subscriber from assigning itself premium forwarding by arbitrary DSCP markings. It would not perform the necessary container isolation for tooling operation: package the helper as a container with constrained network and filesystem privileges.
Question 53
Lakeside Transport has deployed container isolation for tooling to run a small monitoring helper without deploying a full network-function virtual machine. The implementation step was to package the helper as a container with constrained network and filesystem privileges. Which observation demonstrates that the requested service is working?
- The helper starts with only permitted access and the monitoring stream continues.
- The function's network endpoints and state persist after the controlled migration.
- Secure associations are active and frames are protected across the single Ethernet hop.
- Untrusted DSCP is normalized before traffic reaches provider core queues.
Explanation
Correct Answer
A:For container isolation for tooling, successful verification means that the helper starts with only permitted access and the monitoring stream continues. That evidence directly tests whether the provider can run a small monitoring helper without deploying a full network-function virtual machine after deployment.
Incorrect Answers
B:The observation would verify NFV network function migration under the separate requirement to move a software network function between compatible compute hosts. It does not demonstrate the needed container isolation for tooling result: the helper starts with only permitted access and the monitoring stream continues.
C:The observation would verify MACsec provider handoff under the separate requirement to encrypt traffic directly across supported Ethernet links between managed devices. It does not demonstrate the needed container isolation for tooling result: the helper starts with only permitted access and the monitoring stream continues.
D:The observation would verify customer DSCP trust boundary under the separate requirement to prevent a subscriber from assigning itself premium forwarding by arbitrary DSCP markings. It does not demonstrate the needed container isolation for tooling result: the helper starts with only permitted access and the monitoring stream continues.
Question 54
While troubleshooting container isolation for tooling at Coastal Communications, the intended acceptance outcome is still missing: the helper starts with only permitted access and the monitoring stream continues. Which fault condition should be investigated first for this particular design?
- A container image is pushed but the VNF forwarding interfaces are absent.
- A privileged host process is launched outside the container isolation policy.
- A generic IPsec tunnel is configured but Ethernet-link security remains absent.
- The subscriber's self-assigned EF mark is blindly accepted into strict priority.
Explanation
Correct Answer
B:The suspected defect directly frustrates container isolation for tooling: a privileged host process is launched outside the container isolation policy. Correcting it should allow verification that the helper starts with only permitted access and the monitoring stream continues.
Incorrect Answers
A:This defect belongs to NFV network function migration, where the affected outcome is to move a software network function between compatible compute hosts. It is not the direct failure mode identified for the container isolation for tooling design in this case: a privileged host process is launched outside the container isolation policy.
C:This defect belongs to MACsec provider handoff, where the affected outcome is to encrypt traffic directly across supported Ethernet links between managed devices. It is not the direct failure mode identified for the container isolation for tooling design in this case: a privileged host process is launched outside the container isolation policy.
D:This defect belongs to customer DSCP trust boundary, where the affected outcome is to prevent a subscriber from assigning itself premium forwarding by arbitrary DSCP markings. It is not the direct failure mode identified for the container isolation for tooling design in this case: a privileged host process is launched outside the container isolation policy.
Question 55
After Bluebird Infrastructure deploys container isolation for tooling to run a small monitoring helper without deploying a full network-function virtual machine, the primary acceptance check passes (the helper starts with only permitted access and the monitoring stream continues). What remaining operational risk should still be part of the design review?
- Host acceleration and stateful-flow continuity can restrict relocation.
- MACsec does not encrypt a path beyond the protected adjacent Ethernet segment.
- Containers still share host-kernel failure and security boundaries.
- Trusted markings require explicit customer policy and rate limits.
Explanation
Correct Answer
C:The relevant boundary of container isolation for tooling is that containers still share host-kernel failure and security boundaries. Passing the acceptance test does not eliminate this residual operational risk.
Incorrect Answers
A:This concern applies to NFV network function migration in a different scenario where operators need to move a software network function between compatible compute hosts. For the deployed container isolation for tooling approach, the relevant caution is instead that containers still share host-kernel failure and security boundaries.
B:This concern applies to MACsec provider handoff in a different scenario where operators need to encrypt traffic directly across supported Ethernet links between managed devices. For the deployed container isolation for tooling approach, the relevant caution is instead that containers still share host-kernel failure and security boundaries.
D:This concern applies to customer DSCP trust boundary in a different scenario where operators need to prevent a subscriber from assigning itself premium forwarding by arbitrary DSCP markings. For the deployed container isolation for tooling approach, the relevant caution is instead that containers still share host-kernel failure and security boundaries.
Question 56
Horizon Exchange must run a telemetry processing service close to a provider router with available hosting support. The operator is comparing several service-provider methods. Which design or control directly addresses that stated requirement?
- container isolation for tooling
- customer edge ACL anti-spoof
- DDoS control plane differentiation
- application hosting placement
Explanation
Correct Answer
D:application hosting placement matches this requirement: the team should place the approved application in the platform-supported hosting environment. A relevant outcome would be that the application receives specified telemetry while the forwarding plane remains healthy.
Incorrect Answers
A:container isolation for tooling instead addresses a different condition: run a small monitoring helper without deploying a full network-function virtual machine. It would instead require you to package the helper as a container with constrained network and filesystem privileges, not the stated goal to run a telemetry processing service close to a provider router with available hosting support.
B:customer edge ACL anti-spoof instead addresses a different condition: permit only delegated customer source prefixes at a provider access boundary. It would instead require you to apply an ingress ACL matching the customer's assigned source address space, not the stated goal to run a telemetry processing service close to a provider router with available hosting support.
C:DDoS control plane differentiation instead addresses a different condition: distinguish volumetric customer-traffic floods from attacks on the router control plane. It would instead require you to combine upstream DDoS traffic filtering with separate control-plane punt protections, not the stated goal to run a telemetry processing service close to a provider router with available hosting support.
Question 57
At Cedar Wireless, the engineering change is approved for application hosting placement. The specific goal is to run a telemetry processing service close to a provider router with available hosting support. Which implementation step belongs in this change plan?
- Place the approved application in the platform-supported hosting environment.
- Package the helper as a container with constrained network and filesystem privileges.
- Apply an ingress ACL matching the customer's assigned source address space.
- Combine upstream DDoS traffic filtering with separate control-plane punt protections.
Explanation
Correct Answer
A:Implementing application hosting placement requires the operator to place the approved application in the platform-supported hosting environment. This makes the required goal testable using evidence that the application receives specified telemetry while the forwarding plane remains healthy.
Incorrect Answers
B:The proposed step is for container isolation for tooling, whose purpose is to run a small monitoring helper without deploying a full network-function virtual machine. It would not perform the necessary application hosting placement operation: place the approved application in the platform-supported hosting environment.
C:The proposed step is for customer edge ACL anti-spoof, whose purpose is to permit only delegated customer source prefixes at a provider access boundary. It would not perform the necessary application hosting placement operation: place the approved application in the platform-supported hosting environment.
D:The proposed step is for DDoS control plane differentiation, whose purpose is to distinguish volumetric customer-traffic floods from attacks on the router control plane. It would not perform the necessary application hosting placement operation: place the approved application in the platform-supported hosting environment.
Question 58
Willow Regional has deployed application hosting placement to run a telemetry processing service close to a provider router with available hosting support. The implementation step was to place the approved application in the platform-supported hosting environment. Which observation demonstrates that the requested service is working?
- The helper starts with only permitted access and the monitoring stream continues.
- The application receives specified telemetry while the forwarding plane remains healthy.
- Permitted customer sources pass and nonassigned sources are denied and counted.
- Data-plane attack traffic drops while BGP and IGP control sessions remain healthy.
Explanation
Correct Answer
B:For application hosting placement, successful verification means that the application receives specified telemetry while the forwarding plane remains healthy. That evidence directly tests whether the provider can run a telemetry processing service close to a provider router with available hosting support after deployment.
Incorrect Answers
A:The observation would verify container isolation for tooling under the separate requirement to run a small monitoring helper without deploying a full network-function virtual machine. It does not demonstrate the needed application hosting placement result: the application receives specified telemetry while the forwarding plane remains healthy.
C:The observation would verify customer edge ACL anti-spoof under the separate requirement to permit only delegated customer source prefixes at a provider access boundary. It does not demonstrate the needed application hosting placement result: the application receives specified telemetry while the forwarding plane remains healthy.
D:The observation would verify DDoS control plane differentiation under the separate requirement to distinguish volumetric customer-traffic floods from attacks on the router control plane. It does not demonstrate the needed application hosting placement result: the application receives specified telemetry while the forwarding plane remains healthy.
Question 59
While troubleshooting application hosting placement at Atlas Backbone, the intended acceptance outcome is still missing: the application receives specified telemetry while the forwarding plane remains healthy. Which fault condition should be investigated first for this particular design?
- A privileged host process is launched outside the container isolation policy.
- An egress ACL is installed where it never checks inbound spoofed packets.
- The application has CPU allocated but no network or platform service access.
- Only a routing CPU policy is installed while the transit link stays saturated.
Explanation
Correct Answer
C:The suspected defect directly frustrates application hosting placement: the application has CPU allocated but no network or platform service access. Correcting it should allow verification that the application receives specified telemetry while the forwarding plane remains healthy.
Incorrect Answers
A:This defect belongs to container isolation for tooling, where the affected outcome is to run a small monitoring helper without deploying a full network-function virtual machine. It is not the direct failure mode identified for the application hosting placement design in this case: the application has CPU allocated but no network or platform service access.
B:This defect belongs to customer edge ACL anti-spoof, where the affected outcome is to permit only delegated customer source prefixes at a provider access boundary. It is not the direct failure mode identified for the application hosting placement design in this case: the application has CPU allocated but no network or platform service access.
D:This defect belongs to DDoS control plane differentiation, where the affected outcome is to distinguish volumetric customer-traffic floods from attacks on the router control plane. It is not the direct failure mode identified for the application hosting placement design in this case: the application has CPU allocated but no network or platform service access.
Question 60
After Starlight IP Services deploys application hosting placement to run a telemetry processing service close to a provider router with available hosting support, the primary acceptance check passes (the application receives specified telemetry while the forwarding plane remains healthy). What remaining operational risk should still be part of the design review?
- Containers still share host-kernel failure and security boundaries.
- A prefix change requires a synchronized ACL update to avoid customer outage.
- A traffic scrubbing strategy must account for return paths and collateral flows.
- Resource quotas protect router forwarding performance from hosted workloads.
Explanation
Correct Answer
D:The relevant boundary of application hosting placement is that resource quotas protect router forwarding performance from hosted workloads. Passing the acceptance test does not eliminate this residual operational risk.
Incorrect Answers
A:This concern applies to container isolation for tooling in a different scenario where operators need to run a small monitoring helper without deploying a full network-function virtual machine. For the deployed application hosting placement approach, the relevant caution is instead that resource quotas protect router forwarding performance from hosted workloads.
B:This concern applies to customer edge ACL anti-spoof in a different scenario where operators need to permit only delegated customer source prefixes at a provider access boundary. For the deployed application hosting placement approach, the relevant caution is instead that resource quotas protect router forwarding performance from hosted workloads.
C:This concern applies to DDoS control plane differentiation in a different scenario where operators need to distinguish volumetric customer-traffic floods from attacks on the router control plane. For the deployed application hosting placement approach, the relevant caution is instead that resource quotas protect router forwarding performance from hosted workloads.
Implementing and Operating Cisco Service Provider Network Core Technologies (SPCOR) (350-501) Practice Tests