Definitions

Question 1

What is HTTP?

Answer 1

(HyperText Transfer Protocol) - It’s a language to communicate between client and server.

Question 2

What is URI?

Answer 2

(Uniform Resource Identifier) - It’s just a string to identify resource https://resource.com/something

Question 3

What is URL?

Answer 3

The most common form of URI is the Uniform Resource Locator (URL), frequently referred to informally as a web address.

Question 4

What is server?

Answer 4

It’s a program which received HTTP request and sends response.

Question 5

What is client?

Answer 5

It’s a program which sends HTTP request and received response.

Question 6

What is proxy server?

Answer 6

It’s something between client and server to handle some request before sending to server.

Question 7

What is IP address?

Answer 7

It is a numerical label assigned to each device connected to a computer network that uses the Internet Protocol for communication.

Question 8

What is IP?

Answer 8

Internet Protocol - it’s a protocol that delivers different packets between hosts.

Question 9

What is host?

Answer 9

It’s a computer that includes to the network.

Question 10

What is DNS?

Answer 10

Domain Name System. This system helps to transform domain names to ip addresses.

Question 11

What is a package?

Answer 11

The main unit for transfer in the network.

Question 12

What is TCP?

Answer 12

(Transmission Control Protocol) - helps you create a connection between client and server

Question 13

What is Web cache?

Answer 13

it’s a local data storage for the temporary storage (caching) of Web documents, such as Web pages, images, and other types of Web multimedia, to reduce server lag

Question 14

What is the main browser request steps?

Answer 14

Browser and Server
1) Browser ->(request URI) DNS
SET TCP connection
2) Browser ->(http request) Server
3) Browser

Question 15

How to split this http://www.bar.com/foo.html address by URI part?

Answer 15

http:// -> protocol name
www.bar.com -> domen name
/foo.html -> resource name

Question 16

What 2 types of caches exist?

Answer 16

Two types of caching are commonly used in personal computers: memory caching (RAM) and disk caching

Question 17

How we can check that cache has actual value?

Answer 17

The browser can send request check to the server ( in some time interval) and compare responses

Question 18

What is HTTP cookie?

Answer 18

(also called web cookie, Internet cookie, browser cookie, or simply cookie) is a small piece of data sent from a website(webserver) and stored on the user’s computer by the user’s web browser while the user is browsing.

Question 19

How do cookies set to the browser?

Answer 19

1) client -> (request) server

2) client -> ( request with cookies in the headers) server

Question 20

What is Authentication?

Answer 20

Authentication is the process of recognizing a user’s identity. It is the mechanism of associating an incoming request with a set of identifying credentials. The credentials provided are compared to those on a file in a database of the authorized user’s information on a local operating system or within an authentication server.

Question 21

What is authorization?

Answer 21

Authorization is a security mechanism used to determine user/client privileges or access levels related to system resources. (Level of restrictions)