Web Tech

Question 1

What does Hyper Text Mark up Language do?

Answer 1

Describes the content of the webpage. By content we mean the text on the page, any image etc

Question 2

What is the homepage of every website called

Answer 2

index.html

Question 3

What are tags

Answer 3

A html document is made up of tags. Tags tell the browser what the following data is and where it should go

Question 4

What is CSS

Answer 4

Cascading Style Sheets
-A language that defines how webpage will look.

Question 5

what are the the pros and cons of embedding css

Answer 5

CSS can be embedded within HTML
+No need for an external file
+Can make direct changes to a particular HTML element specific to that page
-If you want to change something across many webpages it requires many changes

Question 6

What are the pros and cons of having css be an external file

Answer 6

+A single change can affect every webpage (no copy / paste)
+HTML files are minimal

Question 7

main heading

Answer 7

h1

Question 8

Displays image

Answer 8

img src=”hi.jpg>

Question 9

unordered bullet list

Answer 9

ul

Question 10

ordered list

Answer 10

ol

Question 11

list item

Answer 11

li

Question 12

Hyper link that can be clicked on the webpage

Answer 12

a href =” “

Question 13

set text to bold

Answer 13

b

Question 14

set text as italics

Answer 14

i

Question 15

set text underlined

Answer 15

u

Question 16

new paragraph

Answer 16

p

Question 17

What is the world wide web

Answer 17

Is the collection of webpages/resources/images/etc(the stuff we view in a the browser

Question 18

what is the internet

Answer 18

an inter connected network its the infastructure

Question 19

How is a search engines index maintened

Answer 19

by web crawlers/spiders they are software/programs that continuososly vists publicly available sites to update the websites index entry then follow any hyper links on that page

Question 20

what info is a added to the index by crawlers

Answer 20

-URL
-When last updated / frequency of updates/size of update
-meta data
-how credible/ reliable the webpage is

Question 21

what is meta data

Answer 21

Data / info about the web page added by a web developer (not visable to users)

Question 22

What is page rank

Answer 22

helps the search engine rank web pages by how useful/credable they are

Question 23

How is a web page rank calculated

Answer 23

by how many inbound links it has and the page rank of those webpages

Question 24

Describe how a search engine builds it’s index

Answer 24

Web crawlers / spiders visit publicly available webpages, by following links.
It records info such as URL / date last modified and it’s Page rank on the index and then continues by following any further hyper links

Question 25

what is the purpose of the page rank algorthm

Answer 25

so that webpages can listed in order of relevance

Question 26

What is the purpose of the damping factor

Answer 26

A value between 0 and 1. it is the probability that a user will stop following links

Question 27

What is a server

Answer 27

Usuually a powerful computer that waits for reuests from clients

Question 28

what is a client

Answer 28

A client is a computer that is used by user, it will make requests to server

Question 29

What is a peer to peer network

Answer 29

there is no central server. each computer can communicate and share its resources with any other computer.

Question 30

what are the pros and cons of a centrally run server

Answer 30

+user IDs, passwords and access levels are centrally controlled
+backup is centralised and usually automated
+no access to other users files unless they are shared

Question 31

what are the pros and cons of a centrally run server

Answer 31

+user IDs, passwords and access levels are centrally controlled
+backup is centralised and usually automated
+no access to other users’ files unless they are shared
+used in small medium and large organisations

-Can be expensive to set up and manage

Question 32

What are the pros and cons of peer to peer

Answer 32

+files and programs are stored individual computers
+suitable for a home computer network
+cheap to set up and maintain
+ each computer on the network can act as both client and server
+Files can stored on each computer and shared (only works when the pc is on)

Question 33

What are the pros and cons of client-side processing

Answer 33

+Allows for more interactivity by immanently responding to a user’s action
+quick execution as no communication with the server is required
+removes potentially unnecessary processing from the sever
+Data cannot be intercepted on the way to the server increasing security for the server

-scripts are processed by the client so dependent on the speed of the client
-different browsers process scripts in different ways inconsistencies for the user

Question 34

What are the pros and cons of client-side processing

Answer 34

+Allows for more interactivity by immanently responding to a user’s action
+quick execution as no communication with the server is required
+removes potentially unnecessary processing from the sever
+Data cannot be intercepted on the way to the server increasing security for the server

-scripts are processed by the client so dependent on the speed of the client
-different browsers process scripts in different ways inconsistencies for the user
-JS can be circumvented or modified

Question 35

What is API

Answer 35

Application program interface

allows us to add extra functionalty

Question 36

when should we use client side processing

Answer 36

we should always aim to use client side processing to keep load of the server