Knowing the difference between the nipr and sipr helps prevent?
It helps prevent people from gaining access to information
they're not cleared to access. The Secret Internet Protocol Routing
Network (SIPRNET) contains classified information. Wires for the
SIPRNET are marked so don't even think about touching them, let
alone accessing the network, without proper clearance. The
Non-classified Internet Protocol Routing Network (NIPRNET) is
roughly equivalent to your home network in terms of security; only
non-classified information should exist on the network.