Iridium services are a component of which network?

• A. DISN
• B. Internet
• C. VPN
• D. LAN

Answer: (A)

Iridium services are a component of the Defense Information Systems Network. The DISN is the DoD’s global, secure communications backbone that combines terrestrial and satellite links to deliver voice, data, and video across all levels of operation. Iridium’s satellite constellation provides truly global coverage, including remote and offshore areas where land networks aren’t available, and fits into DISN as a transport option to ensure connectivity for DoD users worldwide. That makes Iridium part of DISN rather than the public Internet, a VPN, or a LAN, which serve different contexts: the Internet is a public network, a VPN is a secure tunnel over various networks, and a LAN is a local network confined to a single site.