Exam 300-115 topic 4 question 111 discussion

It is no longer an edge port once it receives a BPDU so it will generate a TCN. You're right about edge ports don't generate TCN because you don't want TCN every time a PC gets turned on or shutdown but again, once BPDU is received, its no longer an Edge port or a portfast

The answer is A,D the edge port directly transitions to the forwarding state, Neither edge ports or PortFast enabled ports generate topology changes when the link toggles. An edge port that receives a BPDU immediately loses edge port status and becomes a normal spanning tree port. https://www.cisco.com/c/en/us/support/docs/lan-switching/spanning-tree-protocol/24062-146.html#edge

Unlike PortFast, an edge port that receives a BPDU immediately loses its edge port status and becomes a normal spanning-tree port. When an edge port receives a BPDU, it generates a topology change notification (TCN).

Edge Ports The edge port concept is already well known to Cisco spanning tree users, as it basically corresponds to the PortFast feature. All ports directly connected to end stations cannot create bridging loops in the network. Therefore, the edge port directly transitions to the forwarding state, and skips the listening and learning stages. Neither edge ports or PortFast enabled ports generate topology changes when the link toggles. An edge port that receives a BPDU immediately loses edge port status and becomes a normal spanning tree port. At this point, there is a user-configured value and an operational value for the edge port state. The Cisco implementation maintains that the PortFast keyword be used for edge port configuration. This makes the transition to RSTP simpler.