謝謝您;解決了我的疑問。同時TP-Link客服也回文給我、回信速度很快(上周五寫、今天星期一就得到答案了)、不錯;並且也解釋我的另一個問題:有線和無線回程是以"有線"為優先。因為電話尋問0800客服小姐是認為"備援"、如果無線回程不好、才用得上Ethernet Backhaul。 摘要https://www.tp-link.com/en/support/faq/1794/重點: Note: The Wi-Fi backhaul and Ethernet backhaul won’t work at the same time. When two Deco units are connected via an Ethernet cable, the Ethernet backhaul will take effect and Wi-Fi backhaul will be disconnected.