[讨论]一个CCNA问题
Why does the data communication industry use the layered OSI reference model?<br>(Choose two)<br>A It divides the network communication process into smaller and simpler components.Thus aiding component development,design,and troubleshooting<br>B It enables equipment from different vendors to use the same electronic components,thus saving research and development funds.<br>C It supports the evolution of multiple competing standards, and thus provides bussiness opportunities for equipment manufacturers<br>D It encourages industry standardization by defining what functions occur at each layer of the model<br>E It provides a means by which changes in functionality in one layer require changes in other layers CD AD 晓得啦 ：）<br>这几天忙着大家考试和讲座，没有和大家充分沟通，抱歉抱歉。 两种答案?<br>为什么?谁对啊! The main reason the International Organization for Standardization<br>(ISO) released the OSI model was so different vendor networks could work<br>with each other. The OSI model is hierarchical, and the same benefits and advantages can<br>apply to any layered model. The primary purpose of all models, and especially<br>the OSI model, is to allow different vendors’ networks to interoperate.<br>Advantages of using the OSI layered model include, but are not limited to,<br>the following:<br>Allows multiple-vendor development through standardization of<br>network components<br>Allows various types of network hardware and software to communicate<br>Prevents changes in one layer from affecting other layers, so it does not<br>hamper development The OSI model was meant to help vendors create interoperable network<br>devices so that different vendor networks could work with each other. Like<br>world peace, it’ll probably never happen completely, but it’s still a great goal.<br>The OSI model is the primary architectural model for networks. It describes<br>how data and network information are communicated from an application<br>on one computer, through the network media, to an application on another<br>computer. The OSI reference model breaks this approach into layers. 大家关键看看上面的解释。<br> 这道题如果就我来说，可能更偏向AD.大家可以自己分析一下。<br><br>
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