IETF定义的集成服务（IntServ）把Internet服务分成了三种服务质量不同的类型，这三种服务不包括（ ）。
- A.保证质量的服务：对带宽、时延、抖动和丢包率提供定量的保证
- B.尽力而为的服务：这是一般的Internet服务，不保证服务质量
- C.负载受控的服务：提供类似于网络欠载时的服务，定性地提供质量保证
- D.突发式服务：如果有富余的带宽，网络保证满足服务质量的需求
正确答案及解析
正确答案
解析
IETF 集成服务（IntServ）工作组根据服务质量的不同，把 Internet服务分成了三种类型：
①保证质量的服务（Guranteed Services）：对带宽、时延、抖动和丢包率提供定量的保证；
②负载受控的服务（Controlled-load Services）：提供一种类似于网络欠载情况下的服务，这是一种定性的指标；
③尽力而为的服务（Best-Effort）：这是Internet提供的一般服务，基本上无任何质量保证。
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