IPv6协议数据单元由一个固定头部和若干个扩展头部以及上层协议提供的负载组成，其中用于表示松散源路由功能的扩展头是（ ）。如果有多个扩展头部，第一个扩展头部为（ ）。
问题1选项
A.目标头部
B.路由选择头部
C.分段头部
D.安全封装负荷头部
问题2选项
A.逐跳头部
B.路由选择头部
C.分段头部
D.认证头部
正确答案及解析
正确答案
解析
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