污染物的分布
When using Overlay Transport Virtualization （OTV）， how do L2 multicast frames traverse the overlay？（） [" The L2 multicast frames are encapsulated in an OTV packet using the configured control-group multicast address for transport"," The L2 multicast frames are dropped because multicast cannot be carried across the overlay "," The L2 multicast frames are encapsulated in an OTV packet using the configured data-group multicast address for transport"," The L2 multicast frames are forwarded natively across the overlay based on their multicast ID"]
下列哪一种肉制品含水分最多（）。 ["贡丸","腊肠","肉绒","板鸭"]
In an L2TP voluntary tunneling scenario， the VPDN tunnel is terminated between：（） [" The client and the NAS."," The NAS andthe LNS."," The NAS and the LAC."," The client and the LNS."]
关于单板替代关系下面描述正确的有（） ["RWF可以替代TWF使用","TWF可以替代RWF使用","M32可以替代D32使用","D32可以替代M32使用"]
防腐
