Random Qs Flashcards
A DNS primary role is to convert______
An IP address to a domain name
how does HTTP run?
runs over TCP/IP and governs communication between web browsers and web servers
How many main DNS servers are there?
13 (Root Servers)
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.
How many total HTTP requests does a browser send for a web page that does not use any other web resources?
1
In what year did the number of Internet users surpass 3 billion?
2015
Most common HTTP methods?
GET, HEAD, POST, PUT, DELETE
Status 301
Moved permanently. The resource should always be requested at a different URL.
Status 403
Forbidden. the web server does not have permission to access the resource.
Status 500
Internal Server error. Something unexpected happened on the web server
The domain name for the requested path?
Host
What are the parts of an HTTP request/response?
Status line
Zero or more header fields
Empty line
Optional message body
What are the parts of an HTTP request/response?
Status line
Zero or more header fields
Empty line
Optional message body
What is a 404 error?
Page not found
What is a browser?
A program used to view HTML documents, or the World Wide Web.
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
[Entity Formats]
© aka copy;
copy right symbol
[Entity Formats]
“nbsp;”
non-breaking space
[Entity Formats]
† aka dagger;
dagger char
[Entity Formats]
— aka mdash;
em char - long dash
