SECTION B: $60$ Marks

Question Two

a$)$ Define an Internet Protocol?

$(04$ Marks$)$

b$)$ Discuss the significance of the Domain Name System in the internet world.

c$)$ Explain five advantages of the internel.

$(04$ Marks$)$

d$)$ With illustrations, explain the client$-$server architecture in context of web apps.

Question Three

a$)$ Explain what is meant by the term SQL injection. Give an example of a mechanism that can

be deployed to prevent the practice.

b$)$ Write short notes on the following. Explain how to prevent web application attacks in each

scenario.

$(04$ Marks$)$

i$)xSS$

ii$)$ CSRF

c$)$ Describe each of the following terms as used in web development.

$(12$ Marks$)$

i$.$ Hyperlink

ii$.$ Web Browser

iii. Website

iv$.$ Web Page

v$.$ HTML Element

vi$.$ IP Address

Question Four

Assume a grocery store uses a relational database to keep track of all users' and clients'

information and day to day transactions.

a$)$ Write a PHP script required to connect to the grocery database "transactions",

$(02$ Marks$)$

b$)$ Write a PHP script that takes client's Email Address, Username and Password as values from

user registration form and stores them in a table named "client".

$(04$ Marks$)$

Hint: Use prepared statements. Passwords must be hashed.

$($c$)$ With examples, explain each of the following PHP variable scopes.

$(08$ Marks$)$

i$.$ Local variable scope

ii$.$ Global variable scope

$($d$)$ Give three differences between a POST method and a GET method as used in PHP form

submissions,

$(06$ Marks$)$