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TIME_WAIT state, if the last ACK sent by the TCP client is lost, it is re-sent. The time required in the TIME_WAIT state is dependent on the implementation method. Typical values are 30 seconds, 1 minutes, and 2 minutes. The connection is formally closed after waiting, and all resources (including the port number) are released. "Question 1" Why is the handshake three times when it is connected and four times when it is closed?A: The syn+ack message can be sent directly after the server receives

" in the time_wait state, if the last ACK sent by the TCP client is lost, it will be re-sent. The time required in the TIME_WAIT state is dependent on the implementation method. Typical values are 30 seconds, 1 minutes, and 2 minutes. The connection is formally closed after waiting, and all resources (including the port number) are released."Question 1" Why is the handshake three times when it is connected and four times when it is closed? A: The syn+ack message can be sent directly after the se

() method call, but is determined by the JVM. The Destroy () method of the instance is called when the JVM needs to destroy some objects and free up memory spaceTo run the servlet, you must also configure a Web. xml file registration mechanism to find the class file that needs to be run@WebServlet ("/servletlife")//----If you add annotations without Web. xmlSo how do you master a servlet?First 1. Create a servlet to inherit from HttpServletOverriding the Doget/dopost method in the Web. XML conf

"Head Letter D" (INITIAL D) is a Japanese youth cartoon with the theme of Mountain road racing, and an animated series of cartoons (including TV, OVA, and movie versions). Comic book author for the No Shou (しげの), since 1995 began in the Kodansha Society's "Weekly Young Magazine" (weekly ヤングマガジン) on the serial, so far (June 2012) comic book has been published 45 copies, there are more on the car driving skills of the surrounding special books.Pictures from the web and pixiv, like readers can pay

(Disclaimer: this series is intended for you only. the Net Framework is not an explanation of syntax and class usage. Therefore, you can only briefly describe the mentioned classes. If you have any questions, go to msdn to check) We learned the. Net runtime engine and learned that the appdomain should carry various DLL, so let's take a look at the most basic system. dll.CodeBig guy to be referenced.Still old rules, illustration... After read

, because the system will be updated to the latest version of CentOS may be longer. complete! Prompt When the update is completeSee:Step three: Execute commands yum repolist view installation ResultsTo see if you already have the EPEL (Extra Packages for Enterprise Linux) expansion pack, execute the commands and the results are as follows:Execute command:[email protected] ~]# Yum repolistSee figure:If the epel description shown in is found to have been installed successfully, you can continue wi

will send again. The time required in the time_wait status depends on the implementation method. The typical values are 30 seconds, 1 minute, and 2 minutes. After the connection is closed, all resources (including port numbers) are released. [Question 1] Why is there a three-way handshake when the connection is closed, but a four-way handshake when the connection is closed?A: When the server receives the SYN connection request from the client, it can directly send SYN + ACK packets. The ACK pac

In the previous blog, the data displayed in the report is the data of the entire table.What we want to achieve is displayData for a certain period of timeThe design is as follows: add two datetimepicker controls and one button control. The interface is as follows: 1. Modify the SQL statement in the Assembly: Changed: Click Query Builder: 2. Compile the code: Click Finish. An error is displayed in the original code. The date1 and date2 parameters are correct. Modify as follows

is, each session has a number (session ID ). If the dialog is interrupted, the client can re-use the existing "dialog key" as long as the client gives this number and the server has this number record during the next reconnection ", instead of generating a new one. The client provides the session ID. When the server confirms that the number exists, both parties no longer perform the remaining steps in the handshake phase, and directly use the existing conversation key for encrypted communicati

is, each session has a number (session ID ). If the dialog is interrupted, the client can re-use the existing "dialog key" as long as the client gives this number and the server has this number record during the next reconnection ", instead of generating a new one. The client provides the session ID. When the server confirms that the number exists, both parties no longer perform the remaining steps in the handshake phase, and directly use the existing conversation key for encrypted communicati

To a certain extent, android must read more code and think more. Android source code is a very good learning material. This article is to download the android source code. We know that the source code of Android is managed using the distributed version control tool git, Which is troublesome to download. Here we will use the illustration to step by step, and you will surely learn. Step 1. Install VmwareI suppose you are in windows, and the android sour

Illustration of CentOS6.4 two-way login configuration for SSH password-less Authentication Configuring SSH without logon verification is very convenient in many scenarios, especially when managing large cluster services, avoiding tedious password verification. On servers with higher security levels, generally, the password settings are more complex. configuring SSH not only ensures the security of Inter-node communication with the key, but also reduce

Visual illustration of Mysql index structure and mysql index Diagram 1. Simulate and create raw data. On the left side, you can easily describe and simulate the data. The engine is mysiam ~ On the right is a normal simulation data table randomly arranged by EXCEL, and the primary keys are arranged by 1-27 (if the simulation data is not random, it is originally written in order, the index sorting process is not obvious. That is to say, the data on the

(Illustration) 64-bit CentOS is installed on vmwarevm, and IntelVTx is disabled After 64-bit CentOS is installed on a VM today, an error is reported, indicating that IntelVTx is disabled. The solution is as follows. 1. error message: 2. How to enter BIOS: Go to the Virtualization menu and select intel virtual technology. This option should be disabled. Change disabled to enabled. Save the settings and restart. 3. Restart the VM to solve th

[Programming Basics] three handshakes and four waves in the TCP protocol (illustration), programming basics tcp TCP establishment requires three handshakes to be established, and disconnection requires four handshakes. The entire process is shown in: Let's take a look at how to establish a connection. First, the Client sends a connection request message. The Server segment replies to the ACK packet after accepting the connection and allocates resour

The perfect solution for introducing Jquery plug-in errors in Web projects (illustration), webjquery When learning the Jquery plug-in, I encountered an error when I introduced the Jquery plug-in under WebRoot after creating a web project. I don't know why it is so difficult, but the project runs normally, later, I found a solution and shared it here. The solution is as follows: 1. Find ----- windows ---- preferences in MyEclipse, and an interface

Illustration: Setting Wi-Fi hotspots in Ubuntu 12.04Broadband is available in both rooms and dormitories, and computers can access the Internet. But without wireless connection, how can I access the Internet through a mobile phone? Ubuntu12.04 how to set up a wireless hotspot to share the network between the mobile phone and the computer?It is very simple. You only need to operate on the GUI without using shell commands.1. Open Network Connections. Sw

Illustration: getRawX, getRawY, getX, getY in MotionEvent, getScrollX, getScrollY, and motioneventgetrawx in View1. Differences between getRawX, getRawY, getX, and getY When writing android custom controls or determining user gesture operations, you often need to use getRawX (), getRawY (), getX (), and getY () in MotionEvent () obtain the distance between the touch point on the X and Y axes. All four methods return a float parameter in pixels ). GetR

I often see many friends in the Forum (I am actually a newbie) who don't know how to install VMware Tools in linux6.0. So I made the following illustration of the installation process, I am installing VMware Tools under linux6.0 of the local Red Flag. I hope to discuss how to install VMware Tools under linux6.0.1. First install the Red Flag linux6.0, and then load the vmware_tools_linux image file. 2. Click the VM in the menu above VMWare, and then

How to start Tomcat in eclipse [illustration] Source: Saidi blog Author: jasonxing3938 Usually, we start Tomcat and Its console through startup. bat in the bin folder under the tomcat installation directory, which is usually very troublesome during project development. By installing the myeclipse plug-in eclipse, you can directly start Tomcat and Its console from eclipse, saving the trouble of switching back when you start or view errors. In order