单项选择题
Which statement is true，as relates to classful or classless routing？（）
A.RIPV1 and OSPF are classless routing protocols.
B.Classful routing protocols send the subnet mask in routing updates.
C.Automatic summarization at classful boundaries can cause problems on disc……
D.EIGRP and OSPF are classful routing protocols and summarize routes by def……
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A.1
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What value is primarily used to determine which port becomes the root port on each nonroot switch in a spanning-tree topology？（）
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In which solution is a router ACL used？（）
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B.controlling path selection，based on the route metric
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