2. 计算机
  3. In　the　open　systems　interconnection (OSI) reference　model,　"layer"　means　one　of　seven　conceptually　complete,(71) arranged　groups

In　the　open　systems　interconnection (OSI) reference　model,　"layer"　means　one　of　seven　conceptually　complete,(71) arranged　groups

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问题 In　the　open　systems　interconnection (OSI) reference　model,　"layer"　means　one　of　seven　conceptually　complete,(71) arranged　groups　of　services,　functions,　and　protocols,　that　extend　across　all　open　systems.Application　layer　provides　means　for　the　application(72) to　access　the　OSI　environment.　Presentation　layer　provides　for　the　selection　of　a　common　syntax　for　representing　data.(73) layer　provides　the　means　necessary　for　cooperating　presentation　entities　to　organize　and　synchronize　their　dialog　and　to　manage　their　data　exchange.　Transport　layer　provides　a　reliable　end-to-end　data　transfer　service.　Network　layer　provides　for　the　entities　in　the　transport　layer　the　means　for　transferring　blocks　of　data,　by(74) and　switching　through　the　network　between　the　open　systems　in　which　those　entities　reside.　Data　link　layer　provides　services　to　transfer　data　between　network　layer　entities.　Physical　layer　provides　the　mechanical,　electrical,　functional,　and　procedural　means　to　establish,　maintain　and(75) physical　connections　for　transfer　of　bits　over　a　transmission　medium.
选项 A、procedures
B、processes
C、courses
D、schedules
答案B
解析
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