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Differentiate between Protection and Security
Operating system contains a collection of objects, hardware or software. Every object has a unique name and can be accessed via a well-defined set of operations. Protection problem - make sure that each object is accessed correctly and just only by those processes that are permitted to do so.
Security must refer external environment of the system, and protect it from:
a) Unauthorized access.
b) Malicious modification or destruction
c) Accidental introduction of inconsistency.
It is very easy to protect against accidental as compared to the malicious misuse.
The meaning of Protection of user files is that file owner or creator should be capable to control:
What can be done and by whom. Several categories of access to files are:
a) Read
b) Write
c) Execute
d) Append
e)Delete
f) List
the block diagram of an 8086 processor
Q. Example on hamming error correcting code? For illustration a 4-bit matching word can stand for 2 4 =16 values that range from 0 to 15 as: 0000, 0001, 0010, 0011, 0100, 01
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WRITE MISS POLICY: Write allocate fetch on write fetch entire block, then write word into block allocate a new block on each writ allocate block, but
In the case of Static call, the called program is a stand-alone program, it is an executable program. During run time we can call it in our called program. As about Dynamic call, t
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