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2021 Nov ccie routing and switching written exam #350-001 v4.0:
Q201. Refer to the exhibit.
An enterprise network has an upstream connection to two different ISPs that are using eBGP and a publicly assigned PI network.
ISP1 is used as the primary provider, while ISP2 is used for backup. Due to packet loss on the link to ISP1, the network engineers changed the default route on R1 to point to ISP2, but they could not establish any connection until they changed the default route to point back at ISP1.
Which two are possible root causes of the issue? (Choose two.)
A. A. RPVST+ converges faster than RSTP during a topology change. B. STP BPDUs are relayed by all non-root bridges and RSTP BPDUs are generated by each bridge. C. RSTP can only achieve rapid transition to Forwarding on edge ports and on point-to-point links. D. RPVST+ and RSTP are both based upon the IEEE 802.1w specification. Answer: BCD