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  3. Why does the data communication industry use the layered OSI reference model?

Why does the data communication industry use the layered OSI reference model?

admin2019-04-08  57
问题 Why does the data communication industry use the layered OSI reference model?
选项 A、It divides the network communication process into smaller and simpler components, thus aiding component development, design, and troubleshooting．
B、It enables equipment from different vendors to use the same electronic components, thus saving research and development funds．
C、It supports the evolution of multiple competing standards, and thus provides business opportunities for equipment manufacturers．
D、It encourages industry standardization by defining what functions occur at each layer of the model．
E、It provides a means by which changes in functionality in one layer require changes in other layers．
答案A,D
解析 switchport port-security maximum 1这个命令是配置这个端口为安全模式且只允许有学习一个mac地址。Switchport port-security violation shutdown:这句命令的意思是如果借口违反了安全策略就shutdown该接口。
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