Exercise 6.5
1. Match the terms in column 1 with the correct description from column:
| TERM: | DESCRIPTION |
| Applets | small programs written in java to give extra capability to html documents |
| Broadcast | distribution of materials at their request to all users connected to the internet |
| Cookie | small text program stored on a user\'s machine to hold infromation on a website visit. |
| Encryption | coding of data disguised its content |
| Interactive | Ability to users to decide their own pathway through the internet |
| Push | Technology allowing automatic update of software on user machines without direct user requests |
| sniffing | process of checking data packets sent across the internet in order to match contents with set criteria |
| Streaming | speeds up download of large files whereby files are displayed as they are being downloaded |
| VRML | an extension of HTML to handle virtual reality |
| WWW | internet systems supporting hypertext and user friendly browsing |
2) Answer the following questions in full sentences.
a) which is the most dangerous to the internet user?
i) hacking or cracking hacking is going to be worse than cracking.
ii) applets or active X I think that applets are worse than active X as it is an installing programme which could be cracked.
b) what are digital certificates Digital certificates are electronic files that are used to uniquely identify people and resources over networks such as the Internet.
c) who would use digital certificates the government
d) why are firewalls used on the internet to create a clean and popup free internet aswell as attempt to stop most viruses
e) what is the best way to prevent your computer programs from getting a virus by installing a good anti-virus system as it will help prevent your computer from getting a virus
f) Can you see one problem with anti-virus programs? a problem is that people do not update their anti-virus system therefore it goes out of date and does not work.
3a) What is a computer virus? it is a virus which is underdected into a computer, once inside your computer it will destroy data and corrupt data.
bi) A computer user who uses an Internet site that has been infected with a virus the virus will infect the computer which was on this website
ii) A computer user who downloads a game from the Internet without a virus checker. the computer will not if there is a virus in the file it will just do what it is told to do therefore a virus could enter the computer.
iii) A user who opens an unidentified email with a file attachment. if the file attached is a virus it will spread all around the computer causing a lot of damage.
iv) A computer user who receives an electronic mail message containing a virus and passes the message on to other users by electronic mail. whoever this person sent this mail to will also recieve the virus
c) Define these terms:
i ) Trojan Horse - Computer program hidden in another computer program with the purpose of destroying software or collecting information about the use of the computer.
ii) Logic Bomb - is a computer program that lies dormant for a period of time in a systems and is triggered by an event, such as a date.
iii) Boot Sector Virus - Affects the section of a floppy or hard disk that contains operating system and file information. Each time you start your PC with an infected floppy in the drive, the virus can spread.
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