Random Qs Flashcards by Maria Stivala

A DNS primary role is to convert______

An IP address to a domain name

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how does HTTP run?

runs over TCP/IP and governs communication between web browsers and web servers

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How many main DNS servers are there?

13 (Root Servers)

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How many total HTTP requests does a browser send for a web page that contains four web resources: an image, a video, a CSS style sheet, and a JavaScript file?

5 One HTTP request is made for the HTML file, and one request is made for each resource.

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How many total HTTP requests does a browser send for a web page that does not use any other web resources?

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In what year did the number of Internet users surpass 3 billion?

2015

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Most common HTTP methods?

GET, HEAD, POST, PUT, DELETE

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Status 301

Moved permanently. The resource should always be requested at a different URL.

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Status 403

Forbidden. the web server does not have permission to access the resource.

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Status 500

Internal Server error. Something unexpected happened on the web server

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The domain name for the requested path?

Host

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What are the parts of an HTTP request/response?

Status line
Zero or more header fields
Empty line
Optional message body

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What are the parts of an HTTP request/response?

Status line
Zero or more header fields
Empty line
Optional message body

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What is a 404 error?

Page not found

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What is a browser?

A program used to view HTML documents, or the World Wide Web.

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What is a GET request?

Request a representation of the specified resource.

What is a POST request?

Request the web server accept the message body enclosed in the request as a new resource.

What is a PUT request?

Request the web server accept the message body enclosed in the request as a modification of an existing resource.

What is a DELETE request?

Request the web server delete the existing resource.

What is a HEAD request?

Request a response identical to GET but without the response body.

what is a network sniffer?

software that monitors network traffic and allows users to inspect HTTP requests and responses

What is a Scheme?

Characters at the beginning of a URL followed by a colon “:” or a colon and double slashes “://”. Common URL schemes include http, https, mailto, and file.

What is a second-level domain?

the site name itself

What is an IP address?

a unique string of numbers separated by periods that identifies each computer using the Internet Protocol to communicate over a network.

What is browser cache?

an area on the computer's disk where web content can be stored by the web browser for quick retrieval later.

What is an URL?

Uniform Resource Locator | An address for accessing specific web data located on a server

What is Linkrot?

general name for a once valid link that now return a 404 status code.

What is the HTTP protocol?

A set of rules for transferring HTML files among computers

What is the internet?

The interconnection of computers communicating using a set of rules

What is the TCP/IP model?

Application, Transport, Internet, Network Address (Data Link and Physical)

What is the World Wide Web Consortium?

The main international standards organization that traditionally has controlled a number of web standars, including HTML.

What is WHATWG?

an organization that develops a variety of web standards (2019)and whose members include the major browser vendors.

Which status code is sent when the web server wants to redirect the browser to a different URL?

301 OR 302

Who was Tim Berners-Lee?

He invented the World Wide Web

what is https

sends requests and responses that are readable only by the client and server - uses a secure protocol to encrypt

copy right symbol

[Entity Formats] "nbsp;"

non-breaking space

[Entity Formats] † aka dagger;

dagger char

[Entity Formats] — aka mdash;

em char - long dash