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Right choice is (b) Minify JavaScript

The best explanation: MINIFICATION is the process of minimizing CODE and markup in your WEB pages and script files. EFFECTIVELY Minify has built in HTTP static compression. The JS File returns the Minify JavaScript.

The correct choice is (a) /min/builder/

Best explanation: The minified file version PROVIDES the same FUNCTIONALITY while REDUCING the bandwidth of network requests. To NAVIGATE to the Minify CONTROL panel, it is located in the /min/builder/.

The correct option is (b) 404

The explanation: The HTTP 404, 404 Not Found, and 404 ERROR message is a Hypertext Transfer Protocol (HTTP) standard response code, in computer network COMMUNICATIONS, to INDICATE that the client was ABLE to communicate with a given server, but the server could not find what was requested.

Correct choice is (b) To RUN private websites

To explain: If you WANT to run tests on web sites that are not publicly available—like a QA or development environment, or if you can only have your test results stored on your own servers because of legal or other reasons, then INSTALLING your own private instance of WebPagetest is the WAY to GO.

The CORRECT answer is (a) setUserAgent

To ELABORATE: The setUserAgent spoofs the client USER AGENT.

The correct CHOICE is (b) JAVASCRIPT interpreter

Explanation: Minification is ORIGINALLY based on the idea that the JavaScript interpreter ignores white space, LINE breaks, and of course comments, so we can save on total file size of our .js files if we remove those unneeded characters.

The correct answer is (a) BANDWIDTH saving

Best explanation: The CODE used to produce graphics on the CLIENT side is typically much smaller than the IMAGES themselves, creating substantial bandwidth savings. This also helps in increasing web PERFORMANCE.

Right answer is (a) Speed of response to user

Best explanation: The speed at which your application RESPONDS to your users’ INTERACTIONS is what we’ll call RUNTIME performance. BETTER runtime performance results in better user experience.

Correct answer is (c) Read, Remove extraneous characters, gzip the response

Easy explanation: To MINIFY JS, CSS and HTML files, COMMENTS and EXTRA spaces need to be removed, as well as crunch variable names so as to minimize code and reduce file size. Minify reads in the CONTENT, decorates it by way of removing extraneous characters, and gzips the response.

Right choice is (a) 23

The EXPLANATION: There are totally 23 rules in the ruleset of YSlow (V2) NAMELY :

Minimize HTTP Requests

Use a CONTENT Delivery Network

Avoid empty SRC or href

Add an Expires or a Cache-Control Header

Gzip Components

Put StyleSheets at the Top

Put Scripts at the Bottom

Avoid CSS Expressions

Make JavaScript and CSS External

Reduce DNS Lookups

Minify JavaScript and CSS

Avoid Redirects

Remove Duplicate Scripts

Configure ETags

Make AJAX Cacheable

Use GET for AJAX Requests

Reduce the Number of DOM Elements

No 404s

Reduce Cookie Size

Use Cookie-Free Domains for Components

Avoid Filters

Do Not Scale Images in HTML

Make favicon.ico Small and Cacheable

Correct option is (d) All of the mentioned

Best explanation: Firebug is an extension for the Mozilla Firefox browser that allows you to debug and inspect HTML, CSS, the Document OBJECT MODEL (DOM) and JAVASCRIPT. In addition to debugging web pages, Firebug was used for web security testing and web PAGE performance analysis.

Right option is (c) Fixed Side Panel

To elaborate: The FEATURES present in the USER Interface are:

Port of Firebug’s Visual Object REPRESENTATION (AKA Reps)

Recreation of Firebug 1.3 User Interface with pixel precision

Menu options

Resizable Side Panel

Skinnable Interface

Right option is (b) Web performance

For EXPLANATION: Web performance refers to the speed in which web pages are downloaded and DISPLAYED on the user’s web BROWSER. The span of time that you are waiting for the PAGE to be usable depends on web performance.

The correct option is (a) Synchronize

The EXPLANATION is: A three-way handshake is a method USED in a TCP/IP network to create a connection between a local host/client and server. The handshake consists of a Synchronize, Synchronize-ACKNOWLEDGE, and Acknowledge MESSAGE to be passed between the browser and the REMOTE server.

Correct ANSWER is (b) currentTime

For explanation: The currentTime property SETS or returns the current POSITION (in seconds) of the audio/VIDEO playback. In addition to starting and STOPPING sound and video, you can skip (or “seek”) to the desired location within the media by setting the currentTime property.

Right OPTION is (c) disableXHRListener

For EXPLANATION: Only disableXHRListener PROPERTY has a default value FALSE. The properties disableWhenFirebugActive and showIconWhenHidden has a default value of true.

Correct option is (B) bezierCurveTo()

The explanation: A CUBIC bezier curve requires three points. The first two points are control points that are used in the cubic Bézier calculation and the last point is the ENDING point for the curve. This METHOD adds a NEW point P to the subpath and connects it to the current point with a cubic Bezier curve.

Correct answer is (c) Controlled EXECUTION of APPLICATIONS

To explain I would say: Threads are sequential units of controlled execution for applications. A thread of execution is the smallest sequence of PROGRAMMED INSTRUCTIONS that can be MANAGED independently by a scheduler, which is typically a part of the operating system.

The correct choice is (b) Closure COMPILER (advanced)

BEST explanation: The Closure Compiler is a tool for making JAVASCRIPT download and RUNS faster. Instead of compiling from a source language to machine code, it compiles from JavaScript to better JavaScript. The Closure Compiler (advanced) has a more number PERCENT of file size reduction by product.

The CORRECT choice is (a) Sheer file size REDUCTION

For explanation: Minification refers to the PROCESS of removing unnecessary or redundant data without affecting how the RESOURCE is processed by the browser. Sheer file size reduction is the only ONE aspect of the overall determination got from the R along with the minification.

Correct OPTION is (c) Google

For explanation I WOULD say: The Closure COMPILER is a tool for making JavaScript DOWNLOAD and runs faster. Instead of compiling from a source language to machine code, it compiles from JavaScript to better JavaScript. The Closure Compiler was introduced by Google.

Correct choice is (a) ERROR in request

Best explanation: The 500 status code, or Internal SERVER Error, means that server cannot PROCESS the request for an unknown reason. SOMETIMES this code will appear when more specific 5xx errors are more appropriate.

The correct option is (c) Both TCP and UDP COMMUNICATION takes place

Explanation: The transport layer is the layer in the open system INTERCONNECTION (OSI) model responsible for end-to-end communication over a network. The Transport layer is where our TCP (or UDP) communication takes place.

Right choice is (c) TCP three-way handshake

For explanation: A three-way handshake is a method USED in a TCP/IP network to CREATE a CONNECTION between a local host/client and server. It is a three-step method that requires both the client and server to exchange SYN and ACK (acknowledgment) packets before actual data communication BEGINS.

Correct option is (C) Both Acknowledge and Accept the attempt

The explanation is: The HANDSHAKE ALLOWS the server to acknowledge and accept the attempt. The handshake CONSISTS of a SYNCHRONIZE, Synchronize-Acknowledge, and Acknowledge message to be passed between the browser and the remote server.

The correct choice is (d) Both JSMIN and Packer

Best explanation: JSMin is a filter which removes comments and unnecessary WHITESPACE from JavaScript FILES. It typically reduces filesize by half, RESULTING in FASTER downloads. JavaScript optimizers such as JSMin and Packer are specially designed for modern web programming techniques and are able to understand and preserve conditional comments, and similar.

Correct choice is (a) Minify

For EXPLANATION I would say: The YUI Compressor is JavaScript minifier designed to be 100% safe and YIELD a higher compression ratio than most other tools. Just like Minify, YUI Compressor STRIPS out all of the unnecessary CHARACTERS from your JavaScript, INCLUDING spaces, line breaks, and comments.

Correct CHOICE is (c) Registration and Skewing the results

Easiest explanation: XMLHTTPREQUEST (XHR) is an API in the form of an object whose methods transfer data between a web browser and a web server. XHR communications that MAY happen after page LOAD could register as new activity and skew the test results.

The correct answer is (C) YSLOW

Explanation: YSlow analyzes web page performance by examining all the components on the page, including components dynamically CREATED by using JAVASCRIPT. It measures the page’s performance and offers suggestions for IMPROVEMENT.

Right answer is (a) TAP, JUnit

To explain I would say: YSlow for PhantomJS is a command line script that allows page performance ANALYSIS from live URLs. YSlow for PhantomJS introduces new output formats for AUTOMATED test frameworks: TAP (Test ANYTHING Protocol) and JUnit.

Right answer is (a) 2

Explanation: Closure COMPILER can be run in EITHER of two modes:

 In Simple mode it mostly performs like most other minifiers, removing whitespace, line breaks, and comments

In Advanced mode it rewrites the JavaScript by renaming variables and functions from longer descriptive names to single LETTERS to SAVE file size, and it inlines functions, coalescing them into single functions wherever it determines that it can

The correct answer is (b) STATIC COMPRESSION

Best explanation: MINIFICATION is the PROCESS of minimizing code and markup in your web pages and SCRIPT files. Effectively Minify has built in HTTP static compression. This is especially useful if your web host doesn’t allow the gzipping of static content.

The correct choice is (B) JAR file

Easy explanation: The YUI Compressor is JavaScript minifier designed to be 100% safe and yield a higher compression ratio than most other tools. YUI Compressor is a jar file and RUNS from the command line. Because of this, it is easily integrated into a build process. It looks LIKE this:

java -jar yuicompressor-[version].jar [options] [file NAME]

The CORRECT choice is (a) To streamline the visits

Explanation: To ensure that your first-time visits are as streamlined as possible, we NEED to minify our JavaScript. MINIFYING JavaScript results in decreasing the loading time and hence helps in CREATING a better user EXPERIENCE.

Right option is (a) Test stop RUNNING

For EXPLANATION: In the Advanced panel, you can have the test stop running at DOCUMENT completion. That will tell US when the document.onload event is fired, instead of when all assets on the PAGE are loaded.

The correct option is (a) Content encoding

The EXPLANATION is: Minification refers to the PROCESS of removing unnecessary or redundant data without affecting how the resource is processed by the browser. Content encoding is an approach taken by COMPATIBLE web servers and modern web browsers to compress HTML and related textual content, often in the gzip FORMAT.

The correct answer is (a) To specify credentials

To EXPLAIN: In the Auth TAB you can specify credentials to USE if the web site uses HTTP AUTHENTICATION for ACCESS.

Correct option is (c) both deflate and GZIP

The best I can explain: MINIFICATION refers to the process of removing unnecessary or redundant data without AFFECTING how the resource is processed by the browser. Minify reads the JavaScript file in, MINIFIES it and when it responds it sets the accept encoding HTTP header to gzip, deflate.

Right answer is (b) FIREBUG

Explanation: YSlow analyzes web page performance by EXAMINING all the components on the page, including components DYNAMICALLY created by USING JavaScript. It is mandatory to RUN FireBug before running YSlow.