what is stack exchange

1) layer-2 Exchange Technology The layer-2 switching technology is relatively mature. The layer-2 switch is a data link layer device that can identify MAC locations in data packets.Address information, which is forwarded based on the MAC address, and the corresponding MAC addresses and ports are recorded in a local loc

1. What is the use of learning data structures? 2. Is it necessary to learn the algorithm? Reply content:Personally think data structure is one of the most important basic skills of programming! Learn the sequential table and linked list, you know, in the query operation of more programs, you should use the sequential

Experts tell you what a layer-3 switch is. Now every household has their own computer and understands what a layer-3 switch is. At that time, the layer-3 switch was based on software and the forwarding speed was very slow, later, it was developed to implement layer-3 switching with hardware. In, a layer-3 switch was bo

TCP/IP protocol stack and gained a deeper understanding of many concepts. For example, TCP and UDP belong to the same transport layer and are jointly deployed on the IP layer (Network Layer. The IP layer is mainly responsible for transmitting data packets between nodes (end to end). The node here is a network device, such as a computer. Because the IP layer

It is often asked if debug runs normally but release fails. Previous discussions are often empirical and do not point out what the real cause is, and it usually takes luck to find out the real reason. Recently I read some of these posts, to share with you. -------------------------------------- This article mainly includes the following content: The essential dif

Hello everyone, another week did not write any articles submitted! Because recently has been busy preparing for Wui Road integrated Network Marketing public service Training series courses, last night for more than 60 friends on a lesson! Thank you very much for your friends, but also in this article again believe that the introduction of our training course content, After all, at that time in my QQ there are more than 20 on the network of communication SEO QQ group released, but still just came

What are the benefits of friendship links? The benefits of links are not the amount of direct traffic you can bring to your site, but the fact that it will allow search engines to include more of your Web pages. Search engine will be based on the number of exchange links, as well as the quality of exchange links to a site to make a comprehensive evaluation, whic

broadcast all the ports. The continuous cycle of this process, for the whole network of MAC address information can be learned, the second-tier switch is to create and maintain its own address table. Characteristics From the two-layer switch can be inferred from the operating principle of the following three points: (Small series recommended: What is four-lay

C ++ starts from scratch (10) -- What is a class? The previous article explains that the structure only defines the memory layout. class can be written before the type definition operator, that isClassType (class for short), which is no different from the structure (only a small difference, as described in the next article, actually, C ++

, addresses and telephone numbers. Each time that occurs on a page, a request and response are generated. What difference does it have? Why is node able to do this and circumvent existing threading problems? In fact, node is not so mysterious, node website fully explained its philosophy: Node's goal is to provide a s

). After reading this article, you will be able to learn how to use the built-in components in the Windows operating system and the COM objects provided by third parties.This document assumes that you are proficient in the C ++ language. In the example code, we use a bit of MFC and ATL. If you are not familiar with MFC and ATL, this article will thoroughly explain these codes. This article includes the following parts: Com -- what

be modified repeatedly, that is, it cannot be void a () (long);, Which is meaningless. Similarly, because of the type modifier's modifier order from left to right, it is normal to have: void (* pA )(). Assume that a variable definition Statement (which can also be considered as a declaration statement, which is descri

thinking is the way, and the way of practice is the way of teaching ." In a concise and concise manner, the core of the theme of "the mean of the middle" is self-education. "Destiny" refers to the goodness of human nature. "The Way of Thinking" means that people's self-education means doing things according to people's kind nature. Self-education

What is the procedure of the function call, what is the stack out of the stack,When another function is called during the run of a function, the system needs to complete three things be

The role of the chain, as we all know, here I learned from the simple introduction, the chain is a kind of advertising, but more important is the search engine one of the most important optimization means, you can improve the site corresponding keywords in the search engine rankings, improve the site on the search engine weight, improve the site's exposure rate, So that the healthy growth of the site, but n

Basic data typesA primitive type, or a built-in type, is a special type that differs from the class in Java. They are the most frequently used types in our programming.Java is a strongly typed language, and the first declaration of a variable must describe the data type, and the first variable assignment is called the initialization of the variable.There are eigh

Do not say what Ajax is, we talk about Ajax good, like user registration in advance to prompt the user is registered, this can not only reduce the user's time, a better embodiment of the user experience, on a desktop application of the feeling, the following to see what is A

Q: I recently took over a new web project, but to be honest, I haven't touched this code for a long time. I heard that the front-end technology Stack has undergone great changes. I wonder if you are still at the forefront of the developer array? A: To be accurate, I used to write web pages, but now it should be called front end engineer. I do belong to this so-called front-end engineer. In addition, I only returned from the JSCONF and reactconf sides