How many servers are present on NIPRNET according to the system described?

The number of servers present on NIPRNET, as indicated in the context, is nine. This figure is based on the system configuration and architecture that supports the operations and communications across the Navy's Unclassified but Sensitive Internet Protocol Router Network (NIPRNET). Having nine servers allows for adequate redundancy, load balancing, and efficient handling of the network's traffic and services. These servers are vital for ensuring reliable connectivity and data exchange for naval operations.

Understanding the specific number of servers helps in grasping the overall infrastructure of NIPRNET, which is fundamental for service members using this network for various applications and communications. The correct answer reflects a key aspect of NIPRNET's operational capabilities.