2. 计算机
  3. (51)is　a　six　bytes　OSI　layer　2　address　which　is　burned　into　every　networking　device　that　provides　its　unique　identity　for　point　

(51)is　a　six　bytes　OSI　layer　2　address　which　is　burned　into　every　networking　device　that　provides　its　unique　identity　for　point　

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问题 (51)is　a　six　bytes　OSI　layer　2　address　which　is　burned　into　every　networking　device　that　provides　its　unique　identity　for　point　to　point　communication.(52)is　a　professional　organization　of　individuals　in　multiple　professions　which　focuses　on　effort　on　lower-layer　protocols.(53)functions　with　two　layers　of　protocols.　It　can　connect　networks　of　different　speeds　and　can　be　adapted　to　an　environment　as　it　expands.(54)is　the　popular　LAN　developed　under　the　direction　of　the　IEEE802.5.(55)is　the　popular　backbone　technology　for　transmitting　information　at　high　speed　with　a　high　level　of　fault　tolerance　which　is　developed　under　the　direction　of　ANSI.
选项 A、The　hub
B、The　bridge
C、The　router
D、The　proxy
答案B
解析
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