Question 1

An HTTP response code of 200 indicates that the request was successful.

Accepted Answer

An HTTP response code of 200 means that the request was successfully processed by the server and returned a response with the requested information.

Question 2

____ refers to the temporary storage of data for faster access.

Accepted Answer

Caching refers to the temporary storage of data for faster access. Salting is a process of strengthening cryptographic hash functions, while shadowing refers to the use of a backup system in case of computer failure. Hashing is a technique for verifying the integrity of data. Therefore, the best choice is A, caching.

Question 3

The first line of an HTTP message specifies the date.

Accepted Answer

The first line of an HTTP message specifies the request method (e.g. GET, POST) and the requested resource (e.g. /index.html). The date is included in a header field in the message.

Question 4

The ____ header specifies how a web browser should cache any server content it receives.

Accepted Answer

The Cache-Control header is used to specify how a web browser should cache any server content it receives. It can control both the caching duration and behavior, such as whether or not a browser should always revalidate cached content.

Question 5

You can use a server-side script as a proxy to access data from  another domain.

Accepted Answer

This technique, called "Cross-Origin Resource Sharing" (CORS), allows a website to make AJAX requests to a different domain. The server-side script acts as an intermediary, making the request to the other domain on behalf of the client-side code. This is necessary because web browsers typically enforce a security policy called the "same-origin policy", which prevents web pages from making requests to domains other than the one that served the page.

Question 6

Every web page is identified by a unique address called the ____.

Accepted Answer

URL stands for Uniform Resource Locator, which is a unique address that identifies a particular web page on the internet. The other options, such as the host and HTTP, are important components of the URL but do not fully identify the web page.

Question 7

The term ____ refers to the application, usually a web browser, that makes the request.

Accepted Answer

The HTTP client refers to the application, usually a web browser, that makes the request. The HTTP server receives the request and provides the response. The host is the computer or server that is hosting the website or web application. The HTTP URL is the address of the resource being requested.

Question 8

A(n)____ is a data source made available on one domain for use on other domains across the web.

Accepted Answer

A web service is a data source made available on one domain for use on other domains across the web. AJAX request, HTTP service, and DHTML service are not specifically designed for this purpose.

Question 9

After you instantiate an XMLHttpRequest object, you use the ____ method with the instantiated XMLHttpRequest object to specify the request method (such as GET or POST )and URL.

Accepted Answer

The "open()" method is used to specify the request method and URL with the instantiated XMLHttpRequest object.

Question 10

The term ____ refers to a computer system that is being accessed by a remote computer.

Accepted Answer

The term "host" refers to a computer system that is being accessed by a remote computer, while "protocol" refers to the set of rules that govern the exchange of data over a network. "Client" refers to a computer or software application that requests services or resources from a server or other computer system, and "URL" stands for "Uniform Resource Locator" and refers to the web address of a particular resource on the internet.

Question 11

HTTP client requests and server responses are both known as HTTP ____.

Accepted Answer

Both client requests and server responses are considered HTTP messages. They are exchanged between client and server in order to facilitate communication and transfer of data.

Question 12

Ajax gets its name from the fact that when it was first used, it was practical only with JavaScript and ____.

Accepted Answer

Ajax stands for Asynchronous JavaScript and XML. XML is the data format used by Ajax to send and receive data asynchronously between client and server without requiring a full page refresh. While Ajax can work with other technologies like DOM and HTTPS, XML was the primary technology in its early days.

Question 13

By combining the ____ object with DHTML techniques, you can update and modify individual portions of your web page with data received from a web server.

Accepted Answer

The XMLHttpRequest object, commonly known as AJAX (Asynchronous JavaScript and XML), allows for asynchronous communication between the client-side and server-side. It enables web pages to refresh individual parts of the pages without having to reload the entire page, resulting in a smoother and faster user experience. This makes it the best choice for updating and modifying individual portions of a web page with data from a server.

Question 14

You can use a server-side script as a ____ to access data from another domain.

Accepted Answer

A server-side script can act as a proxy, which allows it to retrieve data from another domain by acting as an intermediary between the user and the remote domain. Switches, routers, and firewalls are networking devices that do not perform the same function as a proxy.

Question 15

The  XMLHttpRequest   object can be used to request and receive data without reloading a web page.

Accepted Answer

The XMLHttpRequest object allows for asynchronous communication between the client (e.g. web browser) and server, allowing data to be requested and received without needing to reload the entire web page.

Question 16

The term ____ is another name for a web server and refers to a computer that receives HTTP requests and returns responses to HTTP clients.

Accepted Answer

The term "HTTP server" refers to a computer that receives HTTP requests and returns responses to HTTP clients. This is another name for a web server. URL (A) refers to the address of a resource on the internet. HTTP client (B) refers to the software that sends HTTP requests to a server. Host (D) refers to any computer that is connected to a network.

Question 17

The purpose of the ____ policy is to prevent malicious scripts from modifying the content of other windows, tabs, and frames and prevent the theft of private browser information and information displayed on secure web pages.

Accepted Answer

The same-origin policy is designed to prevent malicious scripts from accessing and modifying the content of other windows, tabs, and frames, and to prevent the theft of private browser information and information displayed on secure web pages. It ensures that scripts running in one domain cannot access or modify content from another domain, unless specifically allowed by the server through the use of CORS (Cross-Origin Resource Sharing). Therefore, option D, same-origin, is the correct choice. The other options relate to different policies or technologies for web security.

Question 18

The XMLHttpRequest object uses ____ to exchange data between a client computer and a web server.

Accepted Answer

The XMLHttpRequest object uses HTTP to exchange data between a client computer and a web server. HTTP is the protocol used for transferring data over the web, and it is the standard protocol used by the XMLHttpRequest object. FTP is another protocol used for transferring files, but it is not used by the XMLHttpRequest object. HTTPS and SSL are not protocols for data exchange, but rather encryption protocols used to secure the exchange of data over the web.

Question 19

____ define information about the request or response message and about the contents of the message body.

Accepted Answer

Headers define information about the request or response message and about the contents of the message body. Queries are used in URLs to request specific information, tags are used in HTML to label and organize content, and labels are used to categorize and organize data.

Question 20

CORS is supported by all browsers in use today.

Accepted Answer

The answer of CORS is supported by all browsers in...

Quiz 11: Updating Web Pages With Ajax