Name one primary data link used to transmit track data between CRC and SOCs.

• A. A high-speed data link such as Link 11 or an equivalent air defense data link used for real-time track updates.
• B. A voice telephone line.
• C. A slow email data channel.
• D. A printed mail system.

Answer: (A)

The key idea here is that transmitting track data between CRC and SOCs requires a fast, secure, real‑time data link designed for air defense networking. Link 11 (or an equivalent air defense data link) is built for exactly this purpose—carrying real‑time radar tracks and related data across multiple nodes, with robust security and anti‑jamming features. This allows CRCs and SOCs to share up-to-date track information quickly so decisions and responses can be coordinated effectively.

Other options don’t fit because they don’t provide real‑time, digital, and secure data transfer. A voice line is mainly for voice and lacks the bandwidth and data integrity needed for track updates. A slow email channel or printed mail are asynchronous and far too slow for timely track updates in a fast-changing air defense environment.