求此题正解?

┈┾﹏ｗǒ_灬嬉 · 发表于 2011-5-19 08:12:49

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

帮看一下这题的答案是否正确?

XIAODANXIAODAN · 发表于 2011-5-19 08:49:09

我感觉答案应该是DEF

Tony · 发表于 2011-5-19 12:58:09

坐等高手

springsymphony · 发表于 2011-5-19 22:03:42

http://bbs.hh010.com/thread-76937-1-1.html

LZ看这贴，和你问的一样

┈┾﹏ｗǒ_灬嬉 · 发表于 2011-5-20 08:50:21

谢谢

lobokatz · 发表于 2011-11-21 00:47:31

ADE

個人覺得還是F是不對的，題目指明了L2 switch，
both layer 2 and layer 3 address information應才是真正不合題目描述

而vlan的本來就是L2的技術，其功能之一增加broadcast domains。硬指broadcast domains與題意不合，我反而覺得有問題

showlink · 发表于 2011-11-21 14:59:47

我也觉得是ADE
广播就是限制在2层的
不做VLAN路由的话，VLAN还是基于2层转发数据帧，做VLAN路由反倒涉及了3层。与题意矛盾

maylanfang · 发表于 2011-11-28 11:03:19

......

張_____________ · 发表于 2013-10-24 14:30:59

正确答案是ADE，看了下你们的答案，有争议的是A和F，A：分割减少了网络中冲突的数量（注意：减少的是冲突，而不是冲突域，冲突域增加，冲突减少。）这里是冲突为不是冲突域，所以A正确。F：Vlan转发基于二层和三层IP。题目描述的是二层交换机，二层交换机不能基于三层IP转发。所以F错误。正确的是ADE。

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