2. 计算机
  3. Networks　can　be　interconnected　by　different　devices.　In　the　physical　layer,　networks　can　be　connected　by(1)or　hubs,　which　just　m

Networks　can　be　interconnected　by　different　devices.　In　the　physical　layer,　networks　can　be　connected　by(1)or　hubs,　which　just　m

admin2009-05-15  33
问题 Networks　can　be　interconnected　by　different　devices.　In　the　physical　layer,　networks　can　be　connected　by(1)or　hubs,　which　just　move　the　bits　from　one　network　to　an　identical　network.　One　layer　up　we　find　bridges　and　switches,　which　operate　at　data　link　layer.　They　can　accept(2),　examine　the　MAC　address,　and　forward　the　frames　to　a　different　network　while　doing　minor　protocol　translation　in　the　process.　In　the　network　layer,　we　have　routers　that　can　connect　two　networks.　If　two　networks　have(3)network　layer,　the　router　may　be　able　to　translate　between　the　packet　formats.　In　the　transport　layer　we　find　transport　gateway,　which　can　interface　between　two　transport　connections.　Finally,　in　the　application　layer,　application　gateways　translate　message(4).　As　an　example,　gateways　between　Internet　e-mail　and　X.400　e-mail　must(5)the　e-mail　message　and　change　various　header　fields.
选项 A、syntax
B、semantics
C、language
D、format
答案B
解析
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