An option that refers to a packet at the end of the queue may require a full list traversal by the receiving TCP stack in order to identify which packet the option refers to.
一个指向队列末尾包的选项可能会迫使接收方的TCP协议栈遍历整个队列以判断此选项指向哪一个包。
Traversal string: The '! 'delimiter is not valid in a parameter list.
遍历字符串：分隔符“！”在参数列表中无效。
Traversal string: The ':' delimiter is only valid as a parameter-name specifier in a parameter list.
遍历字符串：分隔符“：”仅在作为参数列表中参数名的指定符时才有效。
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