问题：
[多选题]28. 下面有关IP报头中DSCP位置的描述，哪一项是正确的?
A.ToS字节/DS字段的高阶6个比特
B.ToS字节的低阶6个比特
C.ToS字节的中间6个比特
D.前3个比特与IP优先级重叠
E.后3个比特与IP优先级重叠
Tags：思科认证CCIE路由和交换分类模拟试题
答案解析：
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