Because the purpose of PortFast is to minimize the time that ports must wait for spanning tree to converge, you should use it only on ports that no other switch is connected to, like access ports for connecting user equipment and servers or on trunk ports when connecting to a router in a router on a stick configuration. If you enable PortFast on a port that is connecting to another switch, you risk creating a spanning tree loop, or with the BPDU guard feature enabled the port will transition in errdisable.
B is correct.
When PortFast is enabled on an interface that is connected to another switch, the primary effect is that PortFast shuts down any port that receives Bridge Protocol Data Units (BPDUs). BPDUs are messages exchanged between switches to establish and maintain a loop-free topology using the Spanning Tree Protocol (STP).
1 day later and a little wiser then yesterday I can tell that I was wrong. BPDU Guard needs to be enabled for that, which is not te case. So answer D is correct
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