null tree 中文意思是什麼
null tree
解釋
零樹-
Defines a null value node in a query expression tree
定義查詢表達式樹中的空值節點。 -
To the issues that ipsec ca n ' t work with nat and multicast very smoothly and ipsec could n ' t also solve qos problem, combined with the national high - tech project of 863, the author has put forward the following viewpoints in the research of the security architecture model of ip layer : as to ipsec ' s working with nat, the author has proposed a scheme of using udp encapsulation along with configuring ipsec tunnel by dhcp and substituting ah with esp null encapsulation ; as to ipsec ' s working with the multicast, the author has proposed that combined with key management using complete binary tree, ipsec security process using espv3 and ahv2 can cooperate with multicast smoothly in multicast environments ; as to solving qos, the author has proposed a scheme of using two - level classifying and two - level scheduling with encryption scheduler and forwarding scheduler. the author has pointed out that combining ipsec with pki can make ipsec more flexible and more practical. based on the previous researches, the author has made an analysis of security risks of ip layer
在ip層安全體系結構模型研究中，針對ipsec在與組播、 nat協同工作等方面存在的問題以及ipsec不能很好解決qos等方面的問題，作者結合國家863高技術項目的研究提出了解決方案：在nat協同工作方面作者提出了採用udp封裝、配合使用dhcp配置ipsec隧道並用espnull封裝代替ah的方案；在與組播協同工作方面作者提出了基於espv3和ahv2的ipsec組播安全處理以及基於完全二又樹的組播密鑰管理的方案；在解決qos問題方面作者提出了採用分類器1和分類器2的兩級分類以及具有加密調度器和轉發調度器的兩級調度的技術方案；同時作者提出了ipsec與pki技術緊密結合，能使ipsec安全通信更加靈活和方便實用。
分享友人