what is primary dns

CDN is the abbreviation of Content Delivery Network, that is the meaning of "contents distribution network". Generally speaking of the Cdn acceleration, generally refers to the Web site acceleration or user download resources accelerated. The basic idea of CDN is to avoid the bottleneck and link that may affect data transmission speed and stability as far as pos

1. Cluster 1.1 What is a cluster Simply put, a cluster (cluster) is a group of computers that provide users with a set of network resources as a whole. These individual computer systems are the nodes (node) of the cluster. An ideal cluster is that the user never realizes the nodes at the bottom of the cluster system,

Q: What is a "WINS server"? What's the effect? A: The WINS (Windows Internet Name Service) server is primarily used for NetBIOS name services, which handle NetBIOS computer names (Computer name), and are also called NetBIOS name servers (NBNS, NetBIOS Name Server). The WINS server can register data such as the computer name, IP address,

same registry key value, that is, the "DisableThumbnailCache" key value under the HKEY_CURRENT_USER \ Software \ Microsoft \ Windows \ CurrentVersion \ Explorer \ Advanced Primary Key. From this analysis, we can conclude that the key value "1" indicates that thumbnail acceleration is prohibited, and the key value "0" indicates that the thumbnail acceleration fun

, constantly people will scan the weak password.Generally for security purposes, do not use the default 22 port, disable password logon, and switch to public key login instead. You need to build your own server, set the domain name. SSH account @ AddressThe address can be a domain name, machine name, IP. You said that either is the real domain name, or is the local hosts.For SSH login, and the use of roo

page to users. So what are the benefits of search engines? In a simple inference, all pages that may generate value to users are valuable to search engines, these pages can be indexed by the search engine to meet the needs of users who finally retrieve them. we call this valueSearch value. As long as a user's information needs can be met and can be achieved through some normal retrieval needs, it is of gre

Preliminary knowledge:What is the process? Here's an excerpt from the WIN32 API guide:"A process is an executing application that includes private virtual address space, code, data, and other operating system resources, such as pipelines, files, and synchronization objects that the process can access." ”As you can see from the definition above, a process has several objects: the address space, the execution

to the data sent beforehand, and then send the data, like a phone call. 3 Application protocol for TCP support: Telnet (remote login), FTP (File Transfer Protocol), SMTP (Simple Mail Transfer Protocol). TCP is used to transmit large amount of data and high reliability requirements. UDP (Subscriber datagram Protocol, user data Protocol) 1) for the connectionless (formal communication does not need to establish a connection with the other party, regard

way to achieve it, which is exactly what you want to achieve. We will establish an aspect to examine all the arguments in the public program. The first thing we have to do is construct the entry point. We'll use the MyClass pointcut from the previous instance and add the Pointcut to select the constructor that needs to check the arguments, and the program guaran

Recently, many people invited me to answer a variety of Java EE development of the primary issues, I do not have to emphasize that the beginning of the basic knowledge of beginners to a solid, what is the basic knowledge of Java? What is the basic knowledge of Java? The ques

No. 0 Chapter Introduction Bitcoin is a set of software, the software code to modify the upgrade will often involve two concepts, one is called a hard fork, a soft fork. What the hell does that mean? The most common definition in the community is the revision of consensus. But "consensus" specifically refers to

The purpose of this title is simple, is to let us day after day in the code page of the Web refactoring workers, to regain the enthusiasm of the industry to face this we love; Examine the primary mistakes that are often overlooked by us in tedious work; take each page with enthusiasm and passion. It's basically what I

before monitoring the website, we should first understand the basic operation of the Network (web). That is, from the browser to enter the URL to the browser display page, what happened in the process? generally can be divided into the following 7 steps:1, enter the URL in the browser. 2. Send to the DNS server and obtain the IP address of the Web server correspo

been performed. 6, Master table reorganization. 7, materialized view registration failed at the master site. 8. Incorrect conversion of a materialized view log from ROWID to primary key. 9. Manual deletion of sys.slog$ entry for the materialized view. Third, the solution 1. Full volume refresh materialized view exec Dbms_mview.refresh (' SCOTT. User_table ', ' C '); exec Dbms_mview.refresh (' SCOTT. User_table '); 2. Adjust the content of fast and co

What is XML? XML is the abbreviation for Extensible Markup language XML is a markup language similar to HTML XML is used to describe the data The markup for XML is not predefined in XML, you must define your own markup X

in today's network era, rub net believe many friends are not unfamiliar. But have you ever thought of such a problem: routers are hackers rub the net, the user will have what harm? Will he threaten the owner, or will he be able to hack me? or the router is connected by a malicious stranger, what can they do? Today we are going to talk about

Replay eygle's example in the speech at the Oracle conference to see what is the master's starting point and face, replay eygle In his speech at the just-concluded Oracle conference, the company demonstrated the optimization of vertices and surfaces through a simple UPDATE statement, what is the knowledge coverage of p

What is the difference between a beginner's code farmer and an advanced code farmer? It sounds like a very obvious problem, but is it so simple? What is the difference between a beginner's code farmer and an advanced code farmer? It sounds like a very obvious problem, but

What is the same ip site query function? Which of the following Experts knows how the query function is implemented for websites with the same ip address? what is the dns reverse resolution function available in many webmaster too

keyword word frequency, format, location and other weight information are also recorded on the record. Inverted index Forward indexing is not yet directly used for rankings. If the user searches for the keyword 2, if only the forward index, the ranking program needs to scan all the files in the index library, find the file containing the keyword 2, and then calculate the correlation. Such calculations do not meet the demand for real-time return of