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i +  FIREWALL

                  The term 'firewall' originally referred to a physical barrier designed to contain a fire or prevent
                  its spread within a building. On a computer, a firewall is a software or hardware-based network

                  security system that controls the incoming and outgoing network traffic according to a set of
                  predefined  rules.  It  acts  as  a  gatekeeper  and  prevents  unauthorised  access  to  a  computer
                  network. It inspects every data packet that arrives on the network and decides whether to
                  allow or block it based on these rules. Essentially, a firewall creates a barrier between a trusted
                  and secure internal network and an external network (such as the Internet) that is considered
                  untrusted and potentially insecure.






                     To Sum Up


                          A computer virus is a type of unwanted computer program which is developed by
                         individuals with an intention to infect the files of a computer, to corrupt a database or
                         to hamper the functioning of a computer system.
                          Malware is a broad term for various types of malicious software designed to damage,
                         disrupt, or gain unauthorized access to a computer system.

                          The different types of malware are the worm, trojan horse, spyware,  ransomware,
                         rootkit and backdoor.
                          Antivirus software is a set of programs designed to identify, prevent, and remove
                         malware from your computer.
                          A firewall is a software or hardware-based network security system that controls the
                         incoming and outgoing network traffic according to a set of predefined rules.





                                                            Exercise


                                                        Section A (Objective)

                  A.  Tick (3) the correct option.
                      1.  Which virus can attack an executable file?
                         a. Program File Virus                           b. Boot Sector Virus

                         c. Macro Virus                                  d. Email virus

                      2.  Which of the following is a malware that gains administrator access to the host system?

                         a. Backdoor                                     b. Rootkit

                         c. Ransomware                                   d. Trojan Horse





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