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Exam JN0-347 topic 1 question 92 discussion

Actual exam question from Juniper's JN0-347
Question #: 92
Topic #: 1
[All JN0-347 Questions]

Which two statements about RSTP are correct? (Choose two.)

  • A. RSTP is not backwards compatible with STP.
  • B. RSTP is backwards compatible with STP.
  • C. RSTP permits multiple root bridges within a Layer 2 domain.
  • D. RSTP permits only a single root bridge within a Layer 2 domain.
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Suggested Answer: BC 🗳️
B: RSTP and STP can co-exist. RSTP achieves its rapid converges over STP through new mechanisms. If a RSTP switch connects to an STP switch, the RSTP switch will drop down to STP convergence speeds on a per-port basis.
C: Unlike 802.1d (STP), 802.1w (RSTP) uses Hello packets between bridges to maintain link states and does not rely on the root bridge.
Reference: https://www.juniper.net/documentation/en_US/junos12.3/topics/concept/mx-series-rstp-port- states-roles.html http://www.ciscopress.com/articles/article.asp?p=474236&seqNum=3

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sajangml
3 years, 10 months ago
Ans should be B and D
upvoted 2 times
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Clxxcv420
4 years, 1 month ago
Disagree with answer C there is no 2 root bridges. what for "backup" port states ? im talking about DR in every segments if it was. for each VLAN we have VSTP & MSTP.
upvoted 1 times
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