B & D are correct.
Port Fast still participate in STP ops.
https://www.arubanetworks.com/techdocs/ArubaOS_64_Web_Help/Content/ArubaFrameStyles/Branch%20Office/PortFast%20and%20BPDU%20Guard.htm
BD are correct.
What are two features of PortFast?
Portfast does two things for us: Interfaces with portfast enabled that come up will go to forwarding mode immediately, the interface will skip the listening and learning state. A switch will never generate a topology change notification for an interface that has portfast enabled.
B & D are correct
A common misunderstanding among people is that portfast disables spanning tree on an interface.
This is not correct, however if you enable portfast on an interface then it will jump to the forwarding state of spanning tree. We still run spanning tree on the interface! So C is incorrect.
The question is ambiguous It's B actually C and D are incorrect if you plugged a switch on that port.
Even if a port is a Port Fast if a switch plugged to that port it will generate BPDU traffic and the port will transition to non-port fast and the switch will participate in the spanning tree. so C and D aren't correct unless we assume that Port Fast has a BPDU guard enabled then C is correct too.
The Source: CCNP and Ccie Enterprise Core 350-401 Official Cert Guide, By Bradley Edgeworth.
Though PortFast is enabled the port still participates in STP
https://www.arubanetworks.com/techdocs/ArubaOS_80_Web_Help/Content/ArubaFrameStyles/Network_Parameters/Portfast%20and%20BPDU%20Guard.htm
B. to enable the port to enter the forwarding state immediately when the host boots up
C. to prevent the port from participating in Spanning Tree Protocol operations
PortFast is a feature that allows a switch port to bypass the normal STP (Spanning Tree Protocol) listening and learning states and immediately transition to the forwarding state. This is beneficial when the port is connected to an end host, as it reduces the time it takes for the host to start sending and receiving data. Configuring PortFast on a switch port attached to an end host serves two purposes: enabling the port to enter the forwarding state immediately when the host boots up (B), and preventing the port from participating in Spanning Tree Protocol operations (C).
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