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.








 

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

This question is in JN0-347 Juniper Networks Certified Specialist (JNCIS-ENT) Exam
For getting Juniper Networks Certified Specialist - Enterprise Routing and Switching (JNCIS-ENT) Certificate








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