What is one of the outputs of the Network Planning step in the Network Management System?

The Network Description Document (NDD) is a critical output of the Network Planning step in the Network Management System as it provides a comprehensive overview of the network’s structure and the necessary components that enable successful operation within a given mission. The NDD outlines the design and specifications of the network, including the types of communications equipment, standards being followed, and connectivity plans. This documentation is essential for ensuring that all team members understand the network's capabilities and limitations, which aids in coordinated efforts during joint operations.

This document serves as a foundational reference that helps in aligning units and ensuring interoperability, which is particularly important when multiple branches or partners are involved in a joint mission. By clearly defining the network's architecture and operational guidelines, the NDD facilitates effective planning and execution of network operations.

In contrast, the other options, such as the Operations Order (OPORD), Network Timeline Report (NTR), and Operational Readiness Report (ORR), serve different purposes and focus areas within the overall operational framework. These documents, while essential in their own right, do not specifically encapsulate the detailed specifications of the network design itself, which is why the Network Description Document is the fitting answer in this context.