Which of these statements best describes VPLS?()
A. Neither broadcast nor multicast traffic is ever flooded in VPL
B. Multicast traffic is flooded but broadcast traffic is not flooded in VPL
C. VPLS emulates an Ethernet switch, with each EMS being analogous to a VLA
D. Because U-PE devices act as IEEE 802.1 devices, the VPLS core must use ST
E. When the provider experiences an outage, IP re-routing restores PW connectivity and MAC re-learning is needed.
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游戏的社会性本质观认为游戏是儿童的一种本能活动。
A. 正确
B. 错误
在PowerPoint2010中动画有两种形式,一种是(),另一种是()。
明代文人张岱因为找到一位诗人的墓地,写下了:“云出无心,谁放林间双鹤;月明有意,即思冢上孤梅。”一联。请问这是哪位诗人的墓地?