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1.别名或者数字的define定义 #define MAXNUM 100 MAXNUM 代表100,编译器在编译时会对MAXNUM替换为100。 #define ALIAS_FUNC caculator 编译时会替换ALIAS_FUNC成caculator 2.define的“函数定义” define可以像函数那
EtherType is a two-octet field in an Ethernet frame. It is used to indicate which protocol is encapsulated in the PayLoad of an Ethernet Frame. This field was first defined by the Ethernet II
相关协议 1) 802.1Q Virtual Bridged Local Area Networks 2) 802.1ad Provider Bridges A Bridge can be logically subdivided into the following components: • S-VLAN component • C-VLAN
相关协议: 1)IEEE 802.1ag 连通性故障管理(CFM:Connectivity Fault Management) 2)IEEE 802.3ah 第一英里的以太网(EFM:Ethernet in the First Mile),其中第57章的以太网OAM 3)ITU-T Y.1731 以太网OAM(Operation, Administration and Maintenan
UML的构造快包含3种: (1) 事物(4种) (2) 关系(4种) (3) 图(9种) 事物是对模型中最具代表性的成分的抽象;关系把事物结合在一起;图聚集了相关的事物。 (2) 关系(4种) UML 中类与类, 类与接口, 接口与接口这间的关系有: 泛化(generalization) 关系
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