5.3 Describe the Role of Network Services Orchestration (NSO) 350-501 Practice Questions (Page 4)

Questions 16–20

1. 16foundation · easy

   When a service instance is deleted in NSO, what does NSO typically do?

   • AIt only marks the service as inactive but keeps the configurations active
   • BIt requires manual intervention to remove the configurations from each device
   • CIt removes the service instance from its database but leaves the device configurations unchanged
   • DIt rolls back the device configurations to the state before the service was provisioned
   Reveal Solution Discussion Select an answer first
2. 17expert · hard

   A service provider has a YANG service model for a VPN service. The model includes a leaf 'vpn-type' that can be 'L2VPN' or 'L3VPN'. The service logic must generate different device configurations depending on the 'vpn-type'. Where should this conditional logic be implemented in NSO?

   • AIn the network element driver (NED) to handle different VPN types.
   • BIn the YANG model using 'when' statements to conditionally include parts of the configuration.
   • CIn the CDB to store different configurations for each VPN type.
   • DIn the service logic (e.g., Python or template) that maps the service instance to device configurations.
   Reveal Solution Discussion Select an answer first
4. 18foundation · easy

   Which NSO component is responsible for translating NSO's internal configuration data into the native configuration format of a specific device model?

   • ANetwork element driver (NED)
   • BConfiguration database (CDB)
   • CRESTCONF API
   • DService manager
   Reveal Solution Discussion Select an answer first
5. 19application · medium

   A service provider wants to offer a new 'Managed Firewall' service. The service must allow customers to specify the firewall vendor, the number of zones, and the inspection profile. The operations team wants to define this service in NSO so that it can be instantiated multiple times with different parameters. What is the first step the team should take?

   • ACreate a YANG service model that defines the service parameters and maps them to device configurations.
   • BUse NSO's built-in CLI to define the service without any modeling.
   • CWrite a Python script that directly configures the firewall devices via NETCONF.
   • DConfigure the firewall devices manually and then import the running config into NSO.
   Reveal Solution Discussion Select an answer first
6. 20expert · hard

   A service provider wants to use NSO to manage devices that do not support NETCONF or RESTCONF, such as older routers that only support SNMP and CLI. The team needs to integrate these devices into NSO's service orchestration. What is the best approach?

   • AUse a CLI NED for these devices, which allows NSO to manage them via CLI.
   • BExclude these devices from NSO and manage them manually.
   • CUpgrade the devices to support NETCONF before integrating them with NSO.
   • DUse SNMP to manage these devices, as NSO supports SNMP natively.
   Reveal Solution Discussion Select an answer first