单选

ATM网络的协议数据单元称为(32)。ATM适配层分为两个子层，这两个子层是(33)子层。(34)是对应于A类业务的ATM适配层，它提供的业务特点是(35)。如果要传送IP数据报，则需要(36)的支持。

A．帧
B．信元
C．分组
D．报文

试题出自试卷《软件水平考试（中级）网络工程师上午（基础知识）试题模拟试卷28》

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