350-901 Question #16: Real Exam Question with Answer & Explanation

Question

A heterogeneous network of vendors and device types needs automating for better efficiency and to enable future automated testing. The network consists of switches, routers, firewalls and load balancers from different vendors, however they all support the NETCONF/RESTCONF configuration standards and use YANG models with every feature the business requires. The business is looking for a buy versus build solution because they cannot dedicate engineering resources, and they need configuration diff and rollback functionality from day 1. Which configuration management for automation tooling is needed for this solution?

Options

• AAnsible
• BAnsible and Terraform
• CNSO
• DTerraform
• EAnsible and NSO

Explanation

Cisco NSO is the purpose-built buy solution for multi-vendor NETCONF/RESTCONF and YANG-based network automation with native diff and rollback functionality.

Common mistakes.

• A. Ansible can use NETCONF modules but does not provide native configuration diff and rollback at the network-device level without significant custom development.
• B. Combining Ansible and Terraform adds infrastructure provisioning capability but still does not provide native NETCONF rollback or multi-vendor YANG orchestration.
• D. Terraform is an infrastructure provisioning tool focused on declarative state management for cloud resources, not NETCONF/YANG-based network device configuration.
• E. Adding Ansible to NSO is unnecessary overhead; NSO alone covers all stated requirements including diff, rollback, and multi-vendor YANG support.

Concept tested. Cisco NSO for multi-vendor NETCONF/YANG automation

Reference. https://developer.cisco.com/docs/nso/

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