在ATM网络中，AAL5用于LAN仿真，以下有关AAL5的描述中不正确的是( )。
- A.AAL5提供面向连接的服务
- B.AAL5提供无连接的服务
- C.AAL5提供可变比特率的服务
- D.AAL5提供固定比特率的服务
正确答案及解析
正确答案
解析
AAL5常用来支持面向链接的数据服务，用于面向连接的文件传输和数据网络应用程序，该程序中在数据传输前已预先设置好连接。这种服务提供可变比特率但不需要为传送过程提供有限延时。AAL5也可以用来支持无连接的服务，该服务的例子包括数据报流量，通常也包括数据网络应用程序，在该程序中在数据传输前没有预先设置连接。但是AAL5并不能提供固定比特率的服务。因此D是错误的。
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