You can use either port 1 or 2 for the SFP, but it will impact which port the RJ-45 cable goes. Using Port 1 for SFP means that you cannot use port 3 for your RJ-45 connection (you'll need to use port 4) Using Port 2 for SFP means that you cannot use port 4 for your RJ-45 connection (you'll need to use port 3)
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I think you mean SFP/SFP+ - yes, you need to buy those as well. They need to match the same type as what AT&T are using, for example single mode, multi-mode, SR/LR/LRM.
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They are all plugged in and configured the same. It was an ARP problem with our Zyxel router. I went ahead and cleared the ARP cache on the router and it worked again. I appreciate everyone who responded.
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If you are doing routed subnets on your MS switch then the first interface needs to be your upstream interface you use for routing to the internet. That's why the GUI is built this way. They make you do your upstream VLAN first that contains the 0.0.0.0/0 route. Only after you have done that you can create the other interfaces for local routing.
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