摘要：DataLinkLayer(数据链路层) The Reference Model（参考模型） | layer | name | | : | : | | 5 | Application layer | | 4 | TransPort layer | | 3 | NetWork layer | | 2 阅读全文

摘要：Defination Computer NetWork A number of individual computers interconnected through a communication network A collection of autonomous computer system 阅读全文