5 years ago in Operating System

To protect system,there are how many security levels?

[A] 1
[B] 2
[C] 3
[D] 4
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seema negi - 3 years ago

there are four level

Akshay Balhara - 3 years ago

Answer is D

Akshay Balhara - 3 years ago

2.Human 3. Operating System 4.Network Level

Akshay Balhara - 3 years ago

1. Physical Level

Akshay Balhara - 3 years ago

There are four levels at which a system must be protected: Physical - The easiest way to steal data is to pocket the backup tapes. Also, access to the root console will often give the user special privileges, such as rebooting the system as root from removable media. Even general access to terminals in a computer room offers some opportunities for an attacker, although today's modern high-speed networking environment provides more and more opportunities for remote attacks. Human - There is some concern that the humans who are allowed access to a system be trustworthy, and that they cannot be coerced into breaching security. However more and more attacks today are made via social engineering, which basically means fooling trustworthy people into accidentally breaching security. Phishing involves sending an innocent-looking e-mail or web site designed to fool people into revealing confidential information. E.g. spam e-mails pretending to be from e-Bay, PayPal, or any of a number of banks or credit-card companies. Dumpster Diving involves searching the trash or other locations for passwords that are written down. ( Note: Passwords that are too hard to remember, or which must be changed frequently are more likely to be written down somewhere close to the user's station. ) Password Cracking involves divining users passwords, either by watching them type in their passwords, knowing something about them like their pet's names, or simply trying all words in common dictionaries. ( Note: "Good" passwords should involve a minimum number of characters, include non-alphabetical characters, and not appear in any dictionary ( in any language ), and should be changed frequently. Note also that it is proper etiquette to look away from the keyboard while someone else is entering their password. ) Operating System - The OS must protect itself from security breaches, such as runaway processes ( denial of service ), memory-access violations, stack overflow violations, the launching of programs with excessive privileges, and many others. Network - As network communications become ever more important and pervasive in modern computing environments, it becomes ever more important to protect this area of the system. ( Both protecting the network itself from attack, and protecting the local system from attacks coming in through the network. ) This is a growing area of concern as wireless communications and portable devices become more and more prevalent.

sapna - 5 years ago

which 3 security levels? plz explain someone

Muhammad Usman Younas
Muhammad Usman Younas - 2 days ago

Muhammad Usman Younas from Lahore, Pakistan is saying 2 is correct answer

Tsega Asresa Mengistu
Tsega Asresa Mengistu - 1 week ago

Tsega Asresa Mengistu from Dessie, Ethiopia is saying 1 is correct answer

Deep - 1 month ago

Deep from Kolkata, India is saying 1 is correct answer

Arpita Dhote
Arpita Dhote - 1 month ago

Arpita Dhote from Pune, India is saying 2 is correct answer

manoj prabhakar
manoj prabhakar - 3 months ago

manoj prabhakar from India is saying 3 is correct answer

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