这段话：
DNS packets support something called name compression.
Each packet has several sections, including Question, Answer, Authoritiy and Additional (all the sections are optional). What you will find is that many of the labels in the names (stored as shown above) are replicated many times in the packet. The way DNS name compression works, is that if the length byte represents a number >128, then that byte and the next byte represent a pointer (an offset, really), into the packet where the labels of the name are continued.
请问：
（1）什么是name compression？
（2）标红处是什么意思？望能讲的浅显易懂，谢谢！！
DNS packets support something called name compression.
Each packet has several sections, including Question, Answer, Authoritiy and Additional (all the sections are optional). What you will find is that many of the labels in the names (stored as shown above) are replicated many times in the packet. The way DNS name compression works, is that if the length byte represents a number >128, then that byte and the next byte represent a pointer (an offset, really), into the packet where the labels of the name are continued.
请问：
（1）什么是name compression？
（2）标红处是什么意思？望能讲的浅显易懂，谢谢！！
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