各种L2数据网具有不同的通信协议与帧结构,其网络节点设备可以是各种类型的数据交换机(X.25、fr、Ethernet和ATM等分组交换机);而L3数据网(IP网或internet)具有统一的TCP/IP通信协议和分组结构,全网采用统一格式的IP地址, 节点设备统一采用面向无连接的路由器。为便于理解,我们可以将L3数据网简单地理解为构建在L2数据网平台上的一个路由器网。
上传时间: 2013-12-23
上传用户:caiiicc
Permission is granted to copy, distribute and/or modify this document under the terms of the GNU free Documentation License, Version 1.1 or any later version published by the free Software Foundation with no Invariant Sections, with no front- Cover Texts, and with no Back-Cover Texts. A copy of the license is included in the section entitled “GNU free Documentation License”.
标签: Permission distribute the document
上传时间: 2016-11-30
上传用户:lxm
(1 . Higher Educati on Admissi on Committee Office of L ianyungang,L ianyungang 222006, China 2 . Modern Educati on Technique Center, Huaihai I nstitute of Technol ogy, L ianyungang 222005, China) Abstract: The outbreak ofARP cheating virus interferes with the nor mal functi oning of LAN. On the basis of thoroughly und standing of the p rinci p les, this paper analyzes the p rinci p les, pattern and classificati ons ofARP in details . And it also discu the tactics t o take strict p recauti ons ofARP fr om t wo sides— — —the administrati on ofLAN and Client Host . The pur pose of the cussi on is t o guarantee the normal running of LAN users . Key words: virus p rinci p les LAN client host
标签: ianyungang Committee Educati Admissi
上传时间: 2013-12-23
上传用户:zhangyigenius
// 入口参数: // l: l = 0, 傅立叶变换 l = 1, 逆傅立叶变换 // il: il = 0,不计算傅立叶变换或逆变换模和幅角;il = 1,计算模和幅角 // n: 输入的点数,为偶数,一般为32,64,128,...,1024等 // k: 满足n=2^k(k>0),实质上k是n个采样数据可以分解为偶次幂和奇次幂的次数 // pr[]: l=0时,存放N点采样数据的实部 // l=1时, 存放傅立叶变换的N个实部 // pi[]: l=0时,存放N点采样数据的虚部 // l=1时, 存放傅立叶变换的N个虚部 // // 出口参数: // fr[]: l=0, 返回傅立叶变换的实部 // l=1, 返回逆傅立叶变换的实部 // fi[]: l=0, 返回傅立叶变换的虚部 // l=1, 返回逆傅立叶变换的虚部 // pr[]: il = 1,i = 0 时,返回傅立叶变换的模 // il = 1,i = 1 时,返回逆傅立叶变换的模 // pi[]: il = 1,i = 0 时,返回傅立叶变换的辐角 // il = 1,i = 1 时,返回逆傅立叶变换的辐角
上传时间: 2017-01-03
上传用户:ynsnjs
POS is a Java® platform-based, mission-critical, ISO-8583 based financial transaction library/framework that can be customized and extended in order to implement financial interchanges.
标签: mission-critical platform-based transaction financial
上传时间: 2013-12-15
上传用户:libenshu01
Fastreport for delphi2009 修改过程,现在CSDN上已有fr 4.7.22 fro delphi2009 下载。但对于绿色版delphi2009,安装该包时总报找不到路径。本文件通过在fastreport 根目录添加delphi2009工程,及批处理,使得绿色版fastreport 也可以顺利安装Fastreport.
标签: Fastreport delphi 2009 for
上传时间: 2017-01-12
上传用户:123456wh
最优化方法的一些基本算法的实现:1,0.618法;2,牛顿法;3,改进牛顿法;4,fr法;5,DFP法
标签: 算法
上传时间: 2013-12-04
上传用户:lvzhr
择PCB板材必须在满足设计需求和可量产性及成本中间取得平衡点。设计需求包含电气和机构这两部分。通常在设计非常高速的PCB板子(大于GHz的频率)时这材质问题会比较重要。例如,现在常用的fr-4材质,在几个GHz的频率时的介质损(dielectric loss)会对信号衰减有很大的影响,可能就不合用。就电气而言,要注意介电常数(dielectric constant)和介质损在所设计的频率是否合用。
上传时间: 2017-04-29
上传用户:VRMMO
servlet api全解 This document is built from the HTML documentations available at java.sun.com. It is regularly updated, when new versions of original documentations become available. To download updates and many other WinHelp and HTMLHelp Java documentations for free, visit franck Allimant s web site : http://www.confluent.fr/javadoc/indexe.html (in English) http://www.confluent.fr/javadoc (in french)
标签: documentations available document servlet
上传时间: 2013-12-14
上传用户:784533221
nios cpu test code this code was generated by altera tool automatically. You can obtain this code from the SOPC builder
标签: code this automatically generated
上传时间: 2014-05-30
上传用户:ddddddos