关于MPLS中标签的封装格式说法正确的是（）。 -题库考试答案搜索网

关于MPLS中标签的封装格式说法正确的是（）。

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2022-04-29 12:58

A、MPLS单个标签的总长度为4个字节（32bits）
B、标签中的TTL字段和IP分组中的TTL（Time To Live，生存时间）意义相同，也具有防止环路的作用
C、标签中的S字段：1bit，用于标识该标签是否是栈底标签，值为1时表明为倒数第二层标签
D、对于以太网、PPP的分组，标签堆栈象“垫层”一样，位于二层报头与数据之间，有VLAN tag时，放到VLAN tag之前

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正确答案

A | B

试题解析

标签： CMS专题中医护理主管护师(中级) 华为认证网络工程师HCNP考试

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