单选题
Which of these statements best describes VPLS?（）
发布日期：2021-07-25
A
Neither broadcast nor multicast traffic is ever flooded in VPLS.
B
Multicast traffic is flooded but broadcast traffic is not flooded in VPLS.
C
VPLS emulates an Ethernet switch, with eachEMS being analogous to a VLAN.
D
Because U-PE devices act as IEEE 802.1 devices, the VPLS core must use STP.
E
When the provider experiences an outage, IP re-routing restores PW connectivity and MAC relearning is needed.
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