Exam JN0-349 topic 1 question 21 discussion

Correct answers should be B and D. - STP uses Root Bridge for communicating the current tree topology, while RSTP uses Non-Root Bridge. source: Open Learning - Enterprise Routing and Switching, Specialist (JNCIS-ENT)>Open Learning - Junos Enterprise Switching>Module 04: Spanning Tree

B and D

"BPDU are sent every hello-time, and not simply relayed anymore. With 802.1D, a non-root bridge only generates BPDUs when it receives one on the root port. In fact, a bridge relays BPDUs more than it actually generates them. This is not the case with 802.1w. A bridge now sends a BPDU with its current information every <hello-time> seconds (2 by default), even if it does not receive any from the root bridge." I guess that means STP (802.1D) uses the root bridge for this purpose. source: https://www.cisco.com/c/en/us/support/docs/lan-switching/spanning-tree-protocol/24062-146.html

Correct answers should be B and D. - STP uses Root Bridge for communicating the current tree topology, while RSTP uses Non-Root Bridge. source: Open Learning - Enterprise Routing and Switching, Specialist (JNCIS-ENT)>Open Learning - Junos Enterprise Switching>Module 04: Spanning Tree

It looks like A,B,D are right here.