CCNA Which three statements accurately describe layer 2 Ethe

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CCNA
Which three statements accurately describe layer 2 Ethernet switches?(choose three)
A.Microsegmentation decreases the number of collisions on the network.
B.if a switch receives a frame for an unkown destination,it uses ARP to resolve the address.
C.Spanning Tree Protocol allows switches to automatically share vlan information.
D.In a properly functioning network with redundant switched paths,each swiched aegment will contain one
root bridge with all its ports in the forwarding state.All other switches in that broadcast domain will have
only one root port.
E.Establishing vlans increases the number of broadcast domains.
F.Switches that are configured with vlans make forwarding decisions based on both layer 2 and layer 3
address information.
Answer:ADF

题目：哪三个选项正确地描述了二层以太网交换机的特点?（选择三个）
A、微小分段减少了网络中冲突域的数量
B、如果交换机接收到一个目的地址不明确的数据帧,它将使用ARP解析这个地址
C、STP允许交换机自动共享VLAN信息
D、在一个有冗余路径并正常工作的网络中,每一个交换网段都将包含一个端口都处于转发状态的根桥,而在同一广播域中的所有其它交换机只能有一个根端口
E、建立VLAN增加了广播域的数量
F、配置了VLAN的交换机通过二层和三层地址信息决定如何转发数据
个人见A选项说小的分段减少了冲突域的数量,交换机相对于集线器等物理层设备是增加了冲突域的数量；选项B在收到目的地址不明确的帧时将直接“泛洪”,与ARP无关；C选项中的STP是用于在二层防止环路产生的,与VLAN没有关系；选项D正确；选项E正确,这是引入VLAN的三大原因之一（另外为方便分组和提高安全性）；选项F正确,给VLAN配个IP地址,然后就可以通过IP地址信息进行数据通信
故,参考答案为：DEF

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