$1.$ A peripheral is a part of the computer which one would find

inside of a computer tower.

$2.$ ADSL is an international standard which makes use of two lines

to give a combined rate of $128$Kbps

$3.$ Malware is a term to describe a type of software which will

cripple or harm a computer system.

$4.$ The purpose of a password with a username is to ensure that

copies of data are kept.

$5.$ The purpose of having a Domain Name services $($DNS$)$ system

in place is to convert Domain names to IP addresses when

browsing the internet.