多项选择题 WhichthreeitemsareconfiguredinMSTconfigurationsubmode？（）

单项选择题 Which of the following specification will allow you to： associate VLAN groups to STP instances so  you can provide multiple forwarding paths for data traffic and enable load balancing？ （）

单项选择题 Which of the following specifications is a companion to the IEEE 802.1w Rapid Spanning Tree  Protocol （RSTP） algorithm， and warrants the use multiple spanning-trees？ （）