Web technologies

Question 1

What is HTML

Answer 1

Hypertext Mark-up Language

Writing web pages for display

Question 2

What is CSS?

Answer 2

Cascading style sheets

Define how HTML elements are to be displayed,CSS

Question 3

HTML to learn

Answer 3

to link to a CSS file

<h1> <h2> <h3>
<img></img> including the src, alt, height and width attributes.
<a> including the href attribute.
<div>

where the input is a textbox (i.e. has the attribute type=”text” and another attribute name to
identify it) or a submit button (i.e. has the attribute type=”submit”)
<p>
</p><li>
<ol>
</ol><ul>
</ul></li></div></a></h3></h2></h1>

Question 4

Query language

Answer 4

SELECT 
FROM
WHERE
LIKE
AND
OR
DELETE
INSERT
DROP

Question 5

What is search engine indexing?

Answer 5

Search engines are web based software utilities that enable users to find resources on the web
Search engines use software robots to collect and index words on web pages
Meta tags are often added to web pages by web developers to help thir pages be found.They can be harvested by web’crawling robots but are not part of t
displayed page

Question 6

What is the pagerank algorithm?

Answer 6

Google developed this to make searches more useful
The PageRank algorithm:
assigns a rank to a page based on the search term used and indications of relevance
is forgiving with spelling mistakes
attempts to deal with millions of pages in a useful way
makes use of inward links to a site to asses its popularity and hence usefulness
assigns inwards links a rank as well
regularly recalculates page ranks

Question 7

Formula for page rank

Answer 7

PR(A)=(1-d)+d

Question 8

Client side processing

Advantages?

Answer 8

Client-side processing is normally carried out by Javascript scripts
Advantages:
web traffic is reduced
the server does less processing
there are fewer delays if data is processed by locally
data can be validated before being sent to the server

Question 9

Disadvanategs of server-side proccesing?

Answer 9

Databases have to be located on the server to be accessible to all users
Server-side databases must be protected from malicious or otherwise damaging interference