Which network is used for unclassified communications?

• A. NIPRNET
• B. SIPRNET
• C. DSN
• D. Internet

Answer: (A)

Within DoD communications, networks are organized by the level of classification they handle. Unclassified communications use NIPRNET, the Non-Secure Internet Protocol Router Network, which is built to carry unclassified and lightly classified DoD traffic under proper security controls. This includes routine email, web access, and non-sensitive data. In contrast, SIPRNET is for information up to SECRET, requiring stricter handling and separate infrastructure. The DSN provides secure voice and certain data services and isn’t used for general unclassified traffic. The Internet is a public, global network and not a DoD internal channel for official unclassified communications; DoD traffic would route through gateways to NIPRNET rather than sending data directly over the public Internet. So, for unclassified communications, the appropriate network is NIPRNET.