VMware Telco Cloud Automation Skills Advanced Practice Exam: Hard Questions 2025

A service provider is experiencing intermittent failures during VNF instantiation in VMware Telco Cloud Automation. The orchestration logs show that the VNFM successfully allocates compute resources, but the VNF lifecycle management scripts fail during the configure phase with timeout errors. Network connectivity tests between the VNFM and VNF instances pass. The VNF package was recently updated to include additional day-2 operations. What is the MOST likely root cause and resolution?

An architect is designing a multi-tenant Telco Cloud Automation deployment for a service provider with strict isolation requirements between enterprise customers. Each tenant requires dedicated VIM resources, separate RBAC policies, and isolated network domains. The solution must support automated tenant provisioning and maintain centralized visibility for the NOC team. Which architectural approach BEST satisfies these requirements?

During a complex network service deployment involving multiple CNFs and VNFs with interdependencies, the orchestration fails at the post-instantiation phase. The logs show that VNF-A successfully instantiates, but CNF-B fails to start because it cannot resolve the service endpoint of VNF-A. Both network functions are in different Kubernetes namespaces within the same cluster. The service descriptor correctly defines the dependency relationship. What is the MOST likely configuration issue?

A telecommunications provider needs to implement automated scaling policies for a virtualized IMS core deployment. The VNF consists of multiple VDUs (P-CSCF, S-CSCF, and HSS components). During peak hours, the S-CSCF experiences high CPU utilization while P-CSCF remains at 30% utilization. The scaling policy must be cost-effective and maintain sub-50ms call setup times. Which scaling strategy should be implemented?

After onboarding a new VNF package to TCA, validation succeeds but instantiation consistently fails with an error indicating 'insufficient placement resources'. The VIM shows adequate CPU, memory, and storage capacity. The VNF descriptor specifies anti-affinity rules, NUMA topology requirements, and SR-IOV network interfaces. Existing VNFs without these advanced features deploy successfully. What troubleshooting approach should be taken FIRST?

A TCA deployment uses multiple VIMs across geographically distributed data centers. The NOC team reports that network service deployments targeting a specific VIM location are succeeding, but performance monitoring shows the VNFs are actually instantiated in a different data center than intended. The service template specifies location constraints using availability zones. What is the MOST likely misconfiguration?

During a VNF lifecycle operation (upgrade from version 2.1 to 2.2), the operation fails mid-process leaving the VNF in an error state. The upgrade involved a rolling upgrade strategy across 6 VDU instances. Post-failure investigation shows 3 instances running version 2.2, 2 instances running version 2.1, and 1 instance in a failed state. The VNF is currently passing traffic but with degraded performance. What is the BEST remediation approach to restore full service without causing additional downtime?

A complex network service chain consists of vFW -> vRouter -> vLB -> vCDN with specific bandwidth and latency requirements between each NF. The service is deployed across a multi-VIM environment with VNFs on OpenStack and CNFs on Kubernetes. Performance monitoring indicates that latency between vRouter and vLB exceeds SLA requirements (>10ms observed vs 5ms required), while all other segments meet requirements. Both NFs are confirmed to be in the same data center. What is the MOST effective approach to diagnose and resolve this issue?

An enterprise is designing a service template for a multi-VNF security service that includes dynamic service chaining based on traffic classification. The service must support automated insertion/removal of VNFs (IDS, DPI, vFW) in the chain based on real-time security policy decisions from an external policy controller. The solution must minimize service disruption during chain modifications. Which TCA capability and design pattern should be used?

A service provider's TCA environment experiences cascading failures where a single VNF instance failure triggers multiple unrelated service alarms and automated remediation actions across different network services. Investigation reveals that several network services share dependency on a common centralized VNF (shared DNS service). The current monitoring configuration triggers healing operations independently per service. How should the monitoring and remediation architecture be redesigned to prevent cascading false-positive remediations?