understanding netflow

An in-depth understanding of Linux Network Technology-Virtual Device initialization summary and a deep understanding of linuxOverview a virtual device is an abstraction built on one or more real devices. There are many to many mappings between virtual devices and real devices, but not all combinations can be defined or supported by the kernel.The following lists some common Virtual Devices: Bonding // bindi

Understanding of fork () functions, and understanding of fork FunctionsAuthor:Wang Shanshan, a lecturer at Huaqing vision embedded College. For those who are new to Unix/Linux operating systems and Write multi-process programs in Linux, fork is one of the most difficult concepts to understand: it returns two values after one execution. First, let's look at the prototype of the fork function: # I nclude # I

GCD encapsulation of personal understanding and application, gcd encapsulation of understandingPersonal Understanding and applications encapsulated by GCD Features > GCD encapsulation frees us from tedious Method Memory and enables direct and fast application. Usage 1. Drag nine GCD files in the project into your project (you 'd better create a folder to save these files for easy management !).

First understanding heat map, first understanding heat Recently, the project asked me to use js Code to implement heat map. A brother in the same group then turned it into an actionscript code based on my js Code. So I searched the internet for a lot of information on heat map implementation: 1. Google Analytic Google Analytics heat map is a new version of Web Page clickthrough visualization tool called Web

Deep understanding of Java Virtual Machine notes-class loading process, deep understanding of virtual machinesI. LoadingThe Loading stage is a stage of the Class Loading process. In the loading phase, the virtual machine must complete the following three tasks:A. Get the binary byte stream that defines this class using the full limit name of a class.B. Convert the static storage structure represented by thi

First understanding of PHP (1) basic syntax, first understanding of php basic syntax I have been preparing to learn PHP, but there was always a problem some time ago, which was delayed for a while. Catch up now! This series only talks about some of my views on PHP, not the nature of the tutorial. In addition, I am a little white, just write casually, please pat. I have studied c, java, python, and HTML. If

In-depth understanding of URL encoding in the Web, in-depth understanding of weburl Web development is inseparable from URLs. URLs are URLs. network standards stipulate that only letters and numbers [0-9a-zA-Z] and some special symbols "$-_. +" are allowed! * '(), "[Excluding parentheses], and reserved words can be directly used for URL without encoding. Therefore, to make our website accessible normally,

Java basics: Understanding and understanding of native keywords Writer: BYSocket) Weibo: BYSocket Douban: BYSocket Navicat is a hashCode method in the source code of java. lang. Object:? 1 public native int hashCode(); Why is there a navicat? This is what I want to learn. So today, The bricklayer wants to summarize navicat.1. Understand native, namely JNI and Java Native Interface All lang

First understanding of Swoole in PHP, first understanding of PHPSwoole Swoole is a PHP advanced Web development framework. It is not designed to improve website performance, but to improve website development efficiency. Minimum Performance Loss in exchange for maximum development efficiency. Using the Swoole framework, you can develop a complex Web function in a short time. Official definition: Swoole: red

Understanding of pure c struct and c ++ struct, and understanding of c struct // Main. cpp // If the file name is. the end of cpp indicates that this is a c ++ source program. // in the c ++ source program, the role of class is exactly the same as that of struct, // except for their default member attributes (the class is private by default, // struct is common by default), and struct has this pointer, and

03-queue group (understanding), 03-queue group understanding 1 # import "XZViewController. h "2 3 // 1. download two images: large image, LOGO 4 // 2. merge two images. 5 // 3. 6 7 @ interface XZViewController () 8 @ property (weak, nonatomic) IBOutlet UIImageView * imageView; 9 @ property (nonatomic, strong) UIImage * image1; 10 @ property (nonatomic, strong) UIImage * image2; 11 @ end 12 13 @ implementati

A deep understanding of memory leaks in JavaScript programs and a deep understanding of javascript Garbage collection frees us from allowing us to focus on application logic rather than memory management. However, garbage collection is not magical. Understand how it works, and how to make it retain the memory that should have been released a long time ago, you can achieve faster and more reliable applicatio

AngularJS self-learning path -- first understanding AngularJS and data binding, first understanding angularjsWhat is AngularJS? AngularJS official documentation introduces it in this way. Client technologies fully written in JavaScript. It works with other long-history Web technologies (HTML, CSS, and JavaScript) to make Web Application Development easier and faster than ever before.AngularJS is mainly used

Deep understanding of the JavaScript series (28): factory mode of design patterns, deep understanding of javascriptIntroduction Similar to the creation mode, when creating an object in the factory mode (as a product in the factory), you do not need to specify a specific class for creating the object. The factory mode defines an interface for creating objects. The subclass determines which class to instantia

A deep understanding of the advanced timer of javascript and a deep understanding of javascript SetTimeout () and setInterval () can be used to create a timer. The basic usage is not described here. This section mainly introduces the javascript code queue. No code in javascript is executed immediately. Once the process is idle, it is executed as soon as possible. Therefore, the time set in the timer does n

A deep understanding of the scope of javascript and a deep understanding of javascript In short, the scope is the accessible scope of variables and functions, that is, the scope controls the visibility and lifecycle of variables and functions. In javascript, variables have two scopes: global and local. Global scope is accessible anywhere in the code, called global variables. In the following three cases GL

execution process, it is used to respond to events initiated by users or program code or events triggered by the system. For example, if you want to input or modify the value of a field in Foxpro and then execute a program, the user-defined functions required by the valid clause and the valid clause must be created by entering code snippets. in access, a control) after the value is entered or modified, you must enter the program content during the event process of the afterupdate event attribut

In-depth understanding and application of the display attribute (1), in-depth understanding of the display Display is officially defined as the type of the box that the element should generate. This article focuses on the six commonly used values: none, block, inline, inline-block, inherit, and flex. Other tables and list-items are not recommended.I. None This element is not displayed. It is mainly distingu

Easy understanding of JavaScript status mode and easy understanding of javascript Status Mode The State mode allows an object to change its behavior when its internal State changes. The object seems to have modified its class. The usage scenarios of the Status mode are also specific, including the following:1. The behavior of an object depends on its state, and it must change its behavior according to its s

Understanding of CSS pseudo classes and understanding of CSS pseudo classes Because I have never been familiar with css pseudo classes much before, and I can't understand a piece of css code on the Internet. A: hover span. title {color: red ;.........} Currently, by querying the css manual, the css pseudo class only represents a State. a: hover only represents the tag in the suspended state of the mouse,