what is dns cache

This article will take a deeper look at what happened to the background as a software developer when you enter a website, you will certainly have a complete hierarchical understanding of how network applications work, and also include the

Check whether the dns server change takes effect.First, let's take a look at the domain name resolution sequence priority:  1. Local DNS Cache2. Local Hosts file3. DNS Server  View the local DNS Cache: ipconfig/displaydns  Clear local DNS Cache:

Using dnsmasq to build a small Intranet DNS dnsmasq is a very small dns server that can solve small-scale dns query problems, such as the Intranet of the IDC. The general idea of www.2cto.com is as follows: Configure dnsmasq as the DNS Cache Server

English Original: http://developer.yahoo.com/performance/rules.htmlChinese Original: http://www.ha97.com/2710.html1. Minimize the number of HTTP requests 80% of the end-user response time is used to download the content. This part of the time

Most DNS clients cache the results of domain name resolution locally, which can speed up access to the same address. When you open a single page, there are usually multiple access requests to the same domain name. Basically, each file, image, and

This article mainly introduces the operation and maintenance of the LNMP tracking, has a certain reference value, now share to everyone, the need for friends can refer to Summary of LNMP's operation and maintenance tracking skills Once upon a time

DNS (DomainNameSystem) is a tcpupd-based service that listens to port 53 of TCP and UPD at the same time. At the beginning, when the network was just born, there were only a few computers connected to the network. With the development of personal

Device Manager:hdwwiz.cplAdd or Remove Programs:appwiz.cplManagement tools:control admintoolsBluetooth:fsquirtCalculator:calcCertificate management:certmgr.mscCharacter Mapping Table:charmapComponent

In real-world development, we sometimes modify the Windows Hosts file to achieve the ability to map the specified domain name to the specified IP. Modify the method as follows:1. The Hosts file location in Windows (WIN10):C:\Windows\System32\drivers\

DNS software is a target that hackers are keen on and may cause security problems. Here are some of the most effective methods to protect DNS servers. (Related articles: protecting the security of Win2003 network servers)1. Use a DNS Forwarder A dns

If the browser through the proxy to access the site, then the DNS function to the proxy server to resolve, at this time to clear the operating system DNS cache, modify the Hosts file, stop the system DnsCache service, empty the browser DNS cache is

Today's traffic manager for Azure has three alternative routing options. Although you can choose any routing method at any time, the configuration file for each traffic manager can only use one route method at a time period.It is important to note

How DNS works:DNS is a TCP/UDP-based service that listens on port 53.Our usual URLs, such as www.qiuye.com, are actually www.qiuye.com. The last point points to the root server, just because the browser we're using now has an auto-pointing

Original: http://igoro.com/archive/what-really-happens-when-you-navigate-to-a-url/As a software developer, you will certainly have a complete hierarchical understanding of how Web applications work, as well as the technologies used in these

After entering the url, you see the homepage of baidu, then how does all this happen?before, recently, I think I will certainly be asked later, or ask such questions, if the Baidu box input query string start, is how to return the things you Need.So

Original: http://igoro.com/archive/what-really-happens-when-you-navigate-to-a-url/As a software developer, you will certainly have a complete hierarchical understanding of how Web applications work, as well as the technologies used in these

1. First of all, you need to enter the URL in the browser:2. The browser finds the IP address of the domain nameThe first step in navigation is to find its IP address by the domain name that is accessed. The DNS lookup process is as follows:

Connect_timeoutOfficial explanation: TCP's Build-time timeoutApplicable occasions: Squid back source and source station built-in timeout time, applicable to the return source direction.Default configuration: Connect_timeout 1

Many friends may have problems in domain name resolution, such: 1. Why can't someone else open my website, but I cannot open it myself? 2. The domain name resolution has been changed and has not yet taken effect. What else do I

Yahoo Team experience: Site page performance optimization of the 34 golden rule1. Minimize the number of HTTP requests (make fewer HTTP requests)80% of the end-user response time is used to download the content. This part of the time includes images