List the major benefits of E-commerce.

Correct Answer: => When a consumer wants to buy a certain product, he go to the website and selects the product he wants to buy => Once the product is selected, the consumer transaction is moved to the online transaction server where he places an order => The informations is exchanged over a secure channel through a private gateway to a processing network => The networked banks accept or reject the transaction All this happens in just a matter of seconds E-commerce is a very secure due to the SSL (Secure Socket Layer) technology

Correct Answer: - Web servers can be infiltrated using the command shell by an attacker to read the HTML files that is getting transferred - If the set-uid scripts are not proper and bad then the infiltration can happen by the attacker - The processes are not given proper permissions so that the password can be changed by using the ?passwd? command to change the password of the system - This also authenticates the user for accessing the system and the files on it containing the data - The program that is used in the operating system doesn?t follow the principle of least privilege and lead to security issues

Correct Answer: Security features are very essential in the system as it provides an overall security of the system by applying the patches and the services that keeps the unwanted access away The security features included are as follows: - Use of algorithms in relation to, the security and the system to, solve the problem of the security - Use of SSL or any encryption method to, protect the system from intrusion or any other attack - Use of SSL in the SimpleWebServer that doesn?t provides the protection against the DoS attack and doesn?t allow the accessing to, be done using the /etc/shadow

Correct Answer: - The infinite file error can be solved when the data will be read continuously from the file - The error can be solved by using the keys that provide only the resources that are required - The following program is as follows: oswwrite ("HTTP/10 200 OK\n\n"); while (c != -1) { sbappend((char)c); c = frread(); } oswwrite (sbtoString()); - This converts the requested file in such a way that if the file exists it shows the messages as ok otherwise it shows an error - Limited file access is to be given to the file to remove the error from the infinite file type

Correct Answer: - Infinite file consists of random bits of code that is stored in /dev/random file used to generate the cryptographic keys - Infinite file consists of the source of infinite data that can be used to provide the response in easy manner - Web server consists of the file that is received by the server in this format GET //dev/random HTTP/10 - Web server provides the continuous data that can be read from /dev/random/ before the web server can run out of the memory - The server crashes out in case it runs out of the memory due to the infinite file type and it is very essential in case of the web security

Correct Answer: - The easiest difference is static HTML once rendered cannot be changed on the other hand dynamic HTML can be changed - Static web pages cannot have database access but dynamic pages can be connected to database - Using static HTML no interactions persist between user and server but dynamic HTML has capability to interact with the user - Static HTML does not require server side coding but dynamic HTML requires server side coding - No animation, games can be developed using the static HTML but on the other hand dynamic HTML can perform this task

Correct Answer: - Positioning: Is some what where we need the object to be placed in the graphical view i:e on screen If we talk in DHTML sense then we have two types of positioning: Relative and Absolute Relative Positioning: Relative positioning is the same as the current HTML3 layout and is best reserved for situations where you want to be sure that the content will revert to this default inside a document that also uses absolute positioning Absolute Positioning: In DHTML absolute positioning means that the object will remain at the same position regardless of the condition of other elements and the size of the browser In simple languages if an object/image is absolutely positioned (STYLE="position: absolute;"), with an offset of 150 pixels to the right and 250 pixels down from the left-hand corner of the browser screen then it will avail this position what ever the circumstances may be - Style Modifications: Style modification indicates the changes in the presentation or the view part that are being made in web page This part comes under Cascading Style Sheet where the user style his web page by using the attributes and the tags that are pre-defined in CSS - Event Handling: As explained earlier Events is the beating heart of any JavaScript application For handling event in DHTML we attach event handler to HTML elements The event handler waits until a certain event, for instance a click on a link, takes place When it happens it handles the event by executing some JavaScript code that has been defined by us After it has executed the code the event handler comes to its initial state and waits for the user to fire any event Hence to handle events in DHTML we need to register an event handler

Correct Answer: DispatchAction is an action that comes with Struts 11 or later, that let us combine Struts actions into single class, each with their own method The orgapachestrutsactionDispatchAction class allows multiple operations to map to the different functions in the same Action class For e:g; html:hidden property="dispatch" value="error"/>

Correct Answer: Nodejs is a framework for web applications built on Google Chrome's JavaScript Engine(V8 Engine) Nodejs is comes with runtime environment on which a cript based on javascript can be interpreted and executed (It is analogus to JVM to JAVA byte code) This runtime environment allows to execute a JavaScript code on any machine outside a browser Because of this runtime of Nodejs, JavaScript is now can be executed on server also Nodejs is provides a rich library of various javascript modules which eases the developement of web application using Nodejs to greater extents

Correct Answer: Aynchronous and Event Driven - All APIs of Nodejs library area unit aynchronous that's non-blocking It basically means that a Nodejs based mostly server not waits for a API to return information Server moves to next API when calling it and a notification mechanism of Events of Nodejs helps server to induce response from the previous API decision Very Fast - Nodejs library is very fast in execution of code Single Threaded but highly Scalable - Nodejs uses a single threaded model with event looping Nodejs uses a single threaded program and same program can services much larger number of requests than traditional server like open source No Buffering - Nodejs applications never buffer any data These applications simply output the data in faster