Unit 4 Exam Questions With Answers With Correct Answers And Explanation

Firewall software is usually installed when a computer is connected to the Internet. State an external hazard that firewall software protects computers from. {Ans: Denial of service attack / attack of network ports / attacks from IP addresses that are known to perform malicious attacks / attack of network services / detection of some malware}A school has all its computers in a local area network. Describe three measures, other than firewall software, that the school could take to help ensure the security of the network. {Ans: Any of the following, with a short explanation: Preventive: · Access rights · Physical security · Passwords · Encryption · Acceptable use policies Corrective · Backup and restore procedures · Redundant hardware · Disaster recovery procedures Detective: · Virus checking software · Firewall software · Audit trails / logs}Other than managing multi-tasking, explain three other functions of an operating system {Ans: · Providing a user interface (1)providing a means of communication between the user and the hardware (1). · Memory management (1)managing multiple programs and the data they use when in main memory at the same time (1). Makes sure that programs cannot access the space allocated to other programs (1).