Operating System (Assignment)

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1.In a multiprogramming and time sharing environment, several users share the system simultaneously. This situation can results in various security problems. a.What are the two such problems?
The two problems in Multiprogramming and time sharing environment are Stealing or copying a user's files; Writing over another program's (belonging to another user or to the OS) area in memory; Using system resources (CPU, disk space) without proper accounting; Causing the printer to mix output by sending data while some other user's file is printing. http://wiki.answers.com/Q/What_are_the_main_two_problems_in_multiprogramming_environment_when_processes_are_run_concurrently_and_share_the_resources

b.Can we ensure the same degree of security in a time shared machine as in a dedicated machine? Explain. Ans:
No, because time-shared machines are far less secure, and are very easy to overload the buffers. Also they are much slower to catch a virus. http://wiki.answers.com/Q/Can_we_ensure_the_same_security_in_a_time-shared_machine_as_in_a_dedicated_machine

2.The issue of resource utilization shows up in differenct forms in different types of operating systems. List what resources must be manged carefully in the following settings: a. Mainframe or Minicomputer systems

Memory, CPU, Storage
b.Workstations connected to servers
Storage, Network Bandwidth
c.Handheld computers
Memory, CPU, Storage, Power
3.Describe the difference symmetric and asymmetric multiprocessing. What are three advantages and one disadvantages of multiprocessor system? Ans:
The difference between symmetric and asymmetric multiprocessing is that in Symmetric processing treats all processors as equals; I/O can be processed on any of them, while Asymmetric processing designates one CPU as the master, which is the only one capable of performing I/O; the master distributes computational work among the other CPUs. Advantagesmultiprocessor system:

Can save money,...
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