2. 计算机
  3. TCP　functions　at　the　Open　System　Interconnection(OSI)(61)layer,　or　Layer　4.　Its　chief　responsibility　is　to　ensure(62)end-to-end　

TCP　functions　at　the　Open　System　Interconnection(OSI)(61)layer,　or　Layer　4.　Its　chief　responsibility　is　to　ensure(62)end-to-end　

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问题 TCP　functions　at　the　Open　System　Interconnection(OSI)(61)layer,　or　Layer　4.　Its　chief　responsibility　is　to　ensure(62)end-to-end　connectivity.　IP,　located　one　layer　down,　at　the　OSI　network　layer,　or　Layer　3,　communicates　the　addresses　of　each(63)sender　and　receiver　to　the　routers　along　the　way.　Routers　and　Layer　3　switches　can　read　IP　and　other　Layer　3(64).　This　information,　combined　with　routing　tables　and　other　network　intelligence,　is　all　it　takes　to　get(65)the　room　or　around　the　world　via　TCP/IP.
选项 A、packet
B、packets
C、packet’s
D、packets’
答案C
解析
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