Difference between Lagency Endpoint and Native Endpoint in PCI express

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Delared

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Hello,

In attached, a figure that illustrate an architecture of PCI Express's Communication.
I can't understand whay the Endpoint N°1 is planted without Swich? and what is the différence between the N°2 (Lagency Endpoint) and the N°3(Native Endpoint).

Thank's
 

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