terminology | 易学教程

What are ports in networking? [closed]

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It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center . I am studying Networking in java.I am not clear about what are ports. Also i need to know about what is a socket? Please explain it well. sgokhales PORTS : In computer networking, the term port can refer to either physical or virtual connection points. Physical network ports allow connecting cables to computers, routers, modems and

What exactly does homoiconicity mean?

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I was trying to understand the Wikipedia article on homoiconity , but it's too verbose and does not explain the main theory behind the word concisely. I should add that I'm not a native English speaker so I prefer simple English over academic white paper quotes. So, what exactly does it mean if a language is homoiconic? What makes C#, Java or JavaScript non-homoiconic? It means "code as data" which is a general characteristic of Lisp family. (add 2 3) Just like above string, which is both a list and also a function call. The "Homo" prefix stands for this characteristic. Scheme is homo-iconic

Difference between system testing and end-to-end testing

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问题 What is end-to-end testing, and what is the difference between it and system testing? They both seem the same and check the application as a whole. Definitions on the net are very confusing. 回答1: For me there isn't really a huge difference between the two and in some establishments the terms could be used interchangeably. Everywhere is different. I would try and explain it like so: System testing : You're testing the whole system i.e. all of it's components to ensure that each is functioning

What's the difference between VCS and SCM?

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问题 I'm doing some research on revision control in practice, and there seems to be two names for the same thing in books and papers: Software Configuration Management (SCM), and Version Control Systems (VCS). The former seems to be popular with software engineers / Java programmers, and the latter with from sysadmins, but both appear, at layman's glance, to mean the same thing. On the other hand, in the past I've interpreted SCM to mean something like puppet or cfengine. Can anyone set me

Are semantics and syntax the same?

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问题 What is the difference in meaning between 'semantics' and 'syntax'? What are they? Also, what's the difference between things like "semantic website vs. normal website", "semantic social networking vs. normal social networking" etc. 回答1: Syntax is the grammar. It describes the way to construct a correct sentence. For example, this water is triangular is syntactically correct. Semantics relates to the meaning. this water is triangular does not mean anything, though the grammar is ok. Talking

What is the difference between REST and HTTP protocols?

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问题 What is the REST protocol and what does it differ from HTTP protocol ? 回答1: REST is an approach that leverages the HTTP protocol, and is not an alternative to it. http://en.wikipedia.org/wiki/Representational_State_Transfer Data is uniquely referenced by URL and can be acted upon using HTTP operations (GET, PUT, POST, DELETE, etc). A wide variety of mime types are supported for the message/response but XML and JSON are the most common. For example to read data about a customer you could use

What is ADT? (Abstract Data Type)

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问题 I am currently studying about Abstract Data Types (ADT's) but I don't get the concept at all. Can someone please explain to me what this actually is? Also what is collection, bag, and List ADT? in simple terms? 回答1: Abstract Data Type(ADT) is a data type, where only behavior is defined but not implementation. Opposite of ADT is Concrete Data Type (CDT), where it contains an implementation of ADT. Examples: Array, List, Map, Queue, Set, Stack, Table, Tree, and Vector are ADTs. Each of these

Difference between web services and web application

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问题 Lets have an example scenario: Client opens a web site and finds the sum of two numbers which he enters from the textboxes.Then clicks on the ADD button.Two parameters are HTTP GET'ed to server where PHP code is written to add the numbers and result is echo'ed. Based on this scenario could anybody explain the difference between Web services and application? 回答1: In your case if you have User Interface for providing two numbers and then getting the result, it should be called a web application

What is a finite state transducer?

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问题 Can someone please tell me what a finite state transducer is? I have read the Wikipedia article and don't understand a thing. 回答1: A finite state transducer (FST) is a finite state automaton (FSA, FA) which produces output as well as reading input, which means it is useful for parsing (while a "bare" FSA can only be used for recognizing, i.e. pattern matching). An FST consists of a finite number of states which are linked by transitions labeled with an input/output pair. The FST starts out in

What is the Difference between a Hash and MAC (Message Authentication code)?

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问题 What is the Difference between a Hash and MAC (Message Authentication code)? By their definitions they seem to serve the same function. Can someone explain what the difference is? 回答1: The main difference is conceptual: while hashes are used to guarantee the integrity of data, a MAC guarantees integrity AND authentication. This means that a hashcode is blindly generated from the message without any kind of external input: what you obtain is something that can be used to check if the message