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1. Dear students get fully solved assignments
Send your semester & Specialization name to our mail id :
help.mbaassignments@gmail.com
or
call us at : 08263069601
ASSIGNMENT
PROGRAM MCA(REVISED FALL 2012)
SEMESTER THIRD
SUBJECT CODE & NAME MCA3030 - LINUX OS
CREDIT 2
BK ID B1563
MAX. MARKS 30
Note: Answer all questions. Kindly note that answers for 10 marks questions should be
approximately of 400 words. Each question is followed by evaluation scheme.
Q. 1. Draw and explain different layers of Linux Operating System.
Answer:Conceptually, the Linux operating system is similar to an onion. It consists of many layers,
one on top of the other. At the very core is the interface with the hardware. The operating system
must know how to communicate with the hardware or nothing can get done. This is the most
privileged aspect of the operating system.
Because it needs to access the hardware
Q. 2. What are run levels? Explain in detail.
Answer:Runlevel isamode of operationin one of the computer operating systems that implement
Unix SystemV-style initialization.Conventionally,sevenrunlevels exist, numbered from zero to six;
though up to ten, from zero to nine[citation needed], may be used. S is sometimes used as a
synonymforone of the levels.Onlyone runlevel isexecutedonstartup;run levels are not executed
one afteranother,i.e.eitherthe runlevel 2, 3 or 4 is executed, not more of them sequentially or in
any other order.
Q. 3. Describe the following:
a) File encryption
Answer: File Encryption means providing security for files that reside on media, in a stored state.
Those are files that are resting on our hard drives, usb drives or any other type of digital media

2. storage. Those are files that are usually not meant to be sent through network, they are stored
locally, being encrypted and temporarily
b) Email encryption
Answer: Email encryptionisencryptionof email messagestoprotectthe contentfrombeingread by
otherentitiesthanthe intendedrecipients.Email encryptionmayalsoinclude authentication. Email
is prone to disclosure of information. Most emails are currently transmitted in the clear (not
encrypted).Bymeansof some availabletools,personsotherthanthe designatedrecipientscan read
the email contents. Email
Dear students get fully solved assignments
Send your semester & Specialization name to our mail id :
help.mbaassignments@gmail.com
or
call us at : 08263069601