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资料参考:树莓派使用4G模块(华为ME909s-821)亲身尝试的可行方法(上)…

RmNet和CDC-ECM区别:更像是两种拨号方式的区别,RmNet获取公网IP,ECD-ECM获取局域网IP. 在高通平台上,rmnet driver 和标准的CDC-ECM是有区别的,rmnet 也是属于CDC-ECM他们具体的区别在于对于USB命令的封装以及使用的USB接口,端点定义方式不同 如果是使用rmnet,那么发起data call是通过QMI工具发的QMI命令,QMI工具为QMICM,QMICM集成了QMI命令 而通过标准的CDC-ECM发起data call,则是发送标准的EC…

--reference Java Heap Memory vs Stack Memory Difference 在数据结构中,堆和栈可以说是两种最基础的数据结构,而Java中的栈内存空间和堆内存空间有什么异同,以及和数据结构中的堆栈有何关系? 一.Java 堆存储空间 堆内存(堆存储空间)会在Java运行时分配给对象(Object)或者JRE的类.只要我们创建了一个对象,那么在堆中肯定会分配一块存储空间给这个对象.而我们熟知的Java垃圾回收就是在堆存储空间上进行的,用以释放那些没有任何引用指向…

# Secrets for authentication using CHAP # client server secret IP addresses abc l2tpd * client:VPN 用户名 server:对应的是 VPN 服务器的名字,该名字必须和 /etc/ppp/options.pptpd 文件中指明的一样,或者设置成 * 号来表示自动识别服务器 secret:VPN 密码 IP addresses:对应的是可以拨入的客户端 IP 地址,如果不需要做特别限制,可以将其设置为…

原本在Ubuntu 15.10用拨号上网没有问题,但升级了16.04 LTS后发现原来的DSL连接不上了.主要表现为: 1.在NetworkManager里面选择DSL Connection能够尝试拨号连接,连上后两三秒就断了: 2.经过多次按照网上方法修改奇怪的配置,最终根本连不上: 3.删掉DSL Connection重新建立一个,同样的问题: 4.尝试删掉NetworkManager的配置文件,Wired Connection和DSL Connection都删了重启服务,企图恢复最原始的样…

I believe the biggest distinction is that a stub you have already written with predetermined behavior. So you would have a class that implements the dependency (abstract class or interface most likely) you are faking for testing purposes and the meth…

在国外看到详细的说明一篇,非常浅显透彻.转给国内的筒子们:-) 原文标题: Spring中的<context:annotation-config>与<context:component-scan>到底有什么不同? 原文出处:http://stackoverflow.com/a/7456501 <context:annotation-config> is used to activate annotations in beans already registered in…

ref:http://stackoverflow.com/questions/271743/whats-the-difference-between-b-and-strong-i-and-em They have the same effect on normal web browser rendering engines, but there is afundamental difference between them. As the author writes in a discussio…

PPP协议PPP协议是二层(数据链路层)协议,常用于拨号上网时客户端向服务器获取IP地址.PPP支持在各种物理类型的点对点串行线路上传输上层协议报文.它具有很多特性,比如支持多协议.提供可选的身份认证服务.以各种方式压缩数据.支持动态地址协商.支持多链路捆绑等等. PPP协议帧格式 PPP数据帧格式如下所示: 7E FF 03       7E 标志 地址 控制 协议域 信息域 校验 标志 1B 1B 1B 2B 缺省1500B 2B 1B 每个PPP数据帧都是以一个标志字节开始和结束的,该字节…

Difference between SendRedirect and forward is one of classical interview questions asked during java web developer interview. This is not just applicable for servlet but also for JSP in which we can use forward action or call sendRedirect() method f…

#include <stdio.h> #include <string.h> // PPP数据帧每一帧都以标识字符0x7E开始和结束: // 由于标识字符的值是0x7E,因此当该字符出现在信息字段中时,PPP需要对它进行转义. // 当PPP使用异步传输时,它把转义字符定义为:0x7D,并使用字节填充RFC-1662标准. // 字节填充RFC-1662标准规定如下: // 1. 把信息字段中出现的每一个0x7E字符转变成字节序列(0x7D,0x5E) // 2. 若信息字段中出现…

最近做的题记录下. 258. Add Digits Given a non-negative integer num, repeatedly add all its digits until the result has only one digit. For example: Given num = 38, the process is like: 3 + 8 = 11, 1 + 1 = 2. Since 2 has only one digit, return it. int addDigi…

最开始,电话线入户,用户买来电脑想上网,最简便的方法想办法利用电话线来实现. 最后想了个法子,用电脑的UART的口连到电话线上: 网络提供商一段也用UART为用户提供网络服务: 那么问题来了,UART的波特率.奇偶校验位怎么定呢? 最后决定先协商一下,就称之为链路控制协议(LCP) 上述阶段还干了一个活就是服务提供商(ISP)为用户分配了一个独有的ID(session id), 以后报文中带着这个ID,就好像用户和服务提供商进行点对点对话,所以叫做点对点协议. 至于协商好以后后续传送IP报文或是…

MySQL: @variable vs. variable. Whats the difference?   up vote351down votefavorite 121 In another question I posted someone told me that there is a difference between: @variable and: variable in MySQL. He also mentioned how MSSQL has batch scope and…

it can be solved by Dynamical Programming.Here are some useful link: Tutorial and Code: http://www.cs.cornell.edu/~wdtseng/icpc/notes/dp3.pdfA practice: http://people.csail.mit.edu/bdean/6.046/dp/ (then click Balanced Partition) What's more, please n…

if you need append some string to element and need set some attribute on these string at the same time,you'b better use appendTo funtion.because you can use this function like this: $(str).appendTo('.content tbody').data(action, EditAction.Add); but…

创建一个函数,接受两个或多个数组,返回所给数组的 对等差分(symmetric difference) (△ or ⊕)数组. 给出两个集合 (如集合 A = {1, 2, 3} 和集合 B = {2, 3, 4}), 而数学术语 "对等差分" 的集合就是指由所有只在两个集合其中之一的元素组成的集合(A △ B = C = {1, 4}). 对于传入的额外集合 (如 D = {2, 3}), 你应该安装前面原则求前两个集合的结果与新集合的对等差分集合 (C △ D = {1, 4} △…

catalog . 引言 . Windows 2000网络结构和OSI模型 . NDIS驱动 . NDIS微端口驱动编程实例 . NDIS中间层驱动编程实例 . NDIS协议层驱动编程实例 . TDI驱动 . TDI的过滤框架 . WFP(Windows Filtering Platform windows过滤平台) 0. 引言 最早出现的网络驱动应该是网卡驱动,这是Windows的下进行网络安全攻防常见的需求,为了进一步分割应用程序的网络数据传输与下层协议直到下层硬件的关系,又出现了协议驱动,…

帧中继: · 两个设备都要启用 帧中继功能, 否则是不能 ping通的 · 两个设备上的接口serial要 no shutdown · · 一定要配置dlci地址(号). 否则就不能起来pvc 可以 在配置 frame-relay pvc route的时候, 指定dlci地址. 两端的地址可以不同, 看isp如何说的. 如果不配置interface-dlci 的话, 就相当于 没有创建 pvc. 当然就不能起来. · 状态 active inactive. 只要是inactive 就表示 "本地…

what's the difference between dim as and dim as new? There is no difference with value types (Integer, Double, Structures, ...). The instance is created anyway in both cases. There is a difference with reference types: Without new, only the space for…

Stored Procedures are pre-compile objects which are compiled for first time and its compiled format is saved which executes (compiled code) whenever it is called. But Function is compiled and executed every time when it is called. For more about stor…

Both parameterized queries and prepared statements are exactly the same thing. Prepared statement seems to be the more commonly used term, but there is no difference between both terms. Parameterized queries and prepared statements are features of da…

What is the difference between categorical, ordinal and interval variables? In talking about variables, sometimes you hear variables being described as categorical (or sometimes nominal), or ordinal, or interval.  Below we will define these terms and…

一.PPP MP实验(用虚拟模板配置) 1.拓扑图…

一.HDLC封装 router9和11上分别配置s0/0如下 conf t int s0/0 encapsulation hdlc do show int s0/0 ip address x.x.x.1 255.255.255.0 no shutdown 即可互相ping通 二.PPP封装 2.1无认证 conf t int s0/0 encapsution ppp no sh 即可.PAP或者CHAP认证是可选的. 2.2单向认证pap 客户端: ppp pap sent-username r…

Difference between LET and LET* in Common LISP   LET   Parallel binding which means the bindings come to life at the same time and they do not shadow each other. The values are effective inside LET and they are undefined outside LET. Just like local…

PPPcode{white-space: pre;} pre:not([class]) { background-color: white; }if (window.hljs && document.readyState && document.readyState === "complete") { window.setTimeout(function() { hljs.initHighlighting(); }, 0);} .main-contain…

1.简介PPP(点到点协议)是为在同等单元之间传输数据包这样的简单链路设计的链路层协议.这种链路提供全双工操作,并按照顺序传递数据包.设计目的主要是用来通过拨号或专线方式建立点对点连接发送数据,使其成为各种主机.网桥和路由器之间简单连接的一种共通的解决方案.点对点协议(PPP)为在点对点连接上传输多协议数据包提供了一个标准方法.PPP 最初设计是为两个对等节点之间的 IP 流量传输提供一种封装协议.在 TCP-IP 协议集中它是一种用来同步调制连接的数据链路层协议(OSI 模式中的第二层),替代…

TIF vs TIFF Many people are confused with similar file extensions that only differ by a single letter. One good example of this is TIF and TIFF. Well, to cut to the point, there is no difference between TIF and TIFF. They both are extensions used by…