The architecture for NASD is described as follows:

The components of the NASD architecture are as follows:
Collaborating Agents are of two types:
Neighbor Aware can be enabled at Scalability Server level for all its agents. Neighbor Aware Agents connect to Collaborating Agents to download the software package. When the package is executed, these agents delete the package.
Normal agents include the agents earlier to 12.9 and the agents added to exclusion list. Normal Agents download the software package directly from the Scalability Server.
If the agent collaboration feature on scalability server is not turned ON, then all agents are treated as Normal Agents. They follow the standard software distribution process by connecting directly to the Scalability Server to download the software package. Normal Agents delete the software package after execution.
Note:
All agents, Collaborating, Neighbor Aware, and Agents always connect to the Scalability Server to get the download instructions.
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