what is sftp and how works

What is ping? Often a netizen asked me this question, in fact, the word ping originally originated from the sonar detection system, intended to refer to the pulse signal from the sonar equipment. In the development of the Internet, the process of detecting the connectivity between two nodes in the network is very similar to the sonar detection process, so the nam

new module and the old module have the same functions and interfaces, even if they use different algorithms and protocols. To transmit information and data correctly between computers and terminals in the network, there must be an agreement or rule on the order of data transmission, data format and content, such an agreement or rule is called an agreement. The network protocol consists of three parts: 1. Semantics:

character interface Tat,python is actually very good, in the interactive environment, then you have to learn the package management/compilation chain (python many C extension) and virtualenv, With these 3 kind of basic can be handy to write a Python small script look, if go web development, PEP333 WSGI protocol What, then understand the Tcp/http protocol layer, gunicorn/gevent such server, you can cast res

the chain, We do more experiments and it works. Second, improve the spider index type. We all know that search engines crawl a page will create an index, the more the index of a site, the search engine to crawl the more pages. and search engine is to rely on each link to find the Web page, we do the construction of the structure of the site, the chain can make all the Web page interoperability, once the s

emerged. Although they differ in detail, they are generally ideologically consistent: they all believe that there is a need for rethinking software development methodologies. First, the software should have to accept the reality of being modified. Today's vision and needs may have changed tomorrow, and software needs to respond quickly to these changes. In order to face this challenge, the agile approach advocates simplicity. Make the simplest system

On Activerecord was mentioned in the previous article. Someone asked in a reply what is activerecord. to be honest, I have been a little confused since I used subsonic last year. What is activerecord, What Is activerecord, and how

There are many things worth learning about in the PPP protocol. Here we will focus on the content of PPP frame relay. First, let's take a look at the basic concepts. PPP: Point-to-Point Protocol. Huawei routers are encapsulated by default and are character-oriented control protocols. HDLC: Advanced Data Link Control Protocol. It is a bit-Oriented Control Protocol and is the default encapsulation of Cisco ro

cable and connector to stick. it's the default connector on most devices and screens, compatible with HD content including HDCP protected Blu-ray, and can carry video, audio, and more all on one cable. one cable and you're done. for now, it's the cable and connector we recommend you standardize on. Now, if you already have equipment using DVI, VGA, or other cables, and it works fine for you, don't feel like you need to rush out and change it, because

negative numbers and decimal points. The number type also has a point where the value of the corresponding DOM element is null ("") if the content in the input box is not a pure number (positive, negative), and the content contains some characters. You can also set a limit on the number of accepted numbers: Instance: Points: Use the following properties to specify the qualification for numeric types: Tip

What the hell is a "byte order"?http://mp.weixin.qq.com/s?__biz=MjM5NTU2MTQwNA==mid=2650652324idx=1sn= 5502d3ab977b9894f50592266544b30cscene=0Big-endian, small-ended thinking.on the importance of order1. Cooking the storyToday's girlfriend overtime, witty she had already prepared the ingredients last night, go home just to cook. Who knows the meeting is a bottoml

address to both hosts; the DHCP administrator can restrict specific computers to use specific IP addresses. Multiple options can be set for each DHCP scope. clients do not need to reset IP addresses when moving between different subnets. But there are also many disadvantages: DHCP cannot find IP addresses that are already in use by non-DHCP clients on the network; When Multiple DHCP servers exist on the network, a DHCP server cannot find the IP address that has been rented out by other servers.

is because the scopes in JavaScript are lexical in nature. Functions run in the scope in which they are defined (within the scope of Foo inside the example above), not in the scope in which this function is run. As long as f is defined in Foo, it can access all the variables defined in Foo, even if the execution of Foo is