Final answer:
Frame aggregation is a feature in 802.11n networks that combines multiple frames into one larger frame, typically known as A-MSDU or A-MPDU, to enhance data transmission efficiency and network performance.
Step-by-step explanation:
The feature in an 802.11n network that allows for the combination of multiple frames into one larger frame is known as frame aggregation. This technique enhances data transmission efficiency by reducing overhead. It can occur in two forms: Aggregated MAC Service Data Unit (A-MSDU), which is the bundling of multiple MSDUs into a single frame, and Aggregated MAC Protocol Data Unit (A-MPDU), which combines multiple MPDUs into a single frame. These features enable an 802.11n network to achieve higher throughput and better performance, especially in environments where traffic consists of numerous small frames.