Cisco 877 modem interface status ?

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hey, i have a few things that needs to be clarified. I know about network layer 1, layer 2 and layer 3 error causes but in real life, you encounter so many different things. Moreover, if case is the serial interface,
i can count the possible issues such as DCE or clocking problem, encapsulation problem, NIC problem etc for
interface status "up" , line protocol "down" and cable problem, device is off, for "down", "down"

However, i wanna ask about Cisco 877 modem connected through fastethernet interfaces to the Cisco
1131 WAPs. If we mention fasthethernet what should i think about

1) fastethernet is up , line protocol is down ? and 2) fastethernet is down, line protocol is down?


for the first, is there any WAPs currently connected? Or , once it was connected but not connected now?

for the second, is it the same as serial interfaces?

 

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If the two devices are connected on Fast Ethernet ports, why would you treat the line/link up/down alerts any differenet to if it was just a PC connected to a switch?