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}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). Manages how data and programs are swapped between RAM and virtual memory (1). · Peripheral management (1)managing inputs to the CPU from peripheral devices such as keyboard (1), and outputs from the CPU to peripheral devices such as printers (1).· File management (1)keeping an index of where all files are stored (1), and where there are blocks of free space (1). · User management Managing user IDs, passwords (1) and access rights (1).}A disk defragmenter may improve the performance of computer.