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NEW QUESTION: 1
Which of the following is best defined as a mode of system termination that automatically leaves system processes and components in a secure state when a failure occurs or is detected in a system?
A. Fail proof
B. Fail Over
C. Fail soft
D. Fail safe
Answer: D
Explanation:
NOTE: This question is referring to a system which is Logical/Technical, so it is in the context of a system that you must choose the right answer. This is very important to read the question carefully and to identify the context whether it is in the Physical world or in the Technical/Logical world.
RFC 2828 (Internet Security Glossary) defines fail safe as a mode of system termination that automatically leaves system processes and components in a secure state when a failure occurs or is detected in the system.
A secure state means in the Logical/Technical world that no access would be granted or no packets would be allowed to flow through the system inspecting the packets such as a firewall for example.
If the question would have made reference to a building or something specific to the Physical world then the answer would have been different. In the Physical World everything becomes open and full access would be granted. See the valid choices below for the Physical context.
Fail-safe in the physical security world is when doors are unlocked automatically in case of
emergency. Used in environment where humans work around. As human safety is prime concern
during Fire or other hazards.
The following were all wrong choices:
Fail-secure in the physical security world is when doors are locked automatically in case of
emergency. Can be in an area like Cash Locker Room provided there should be alternative
manually operated exit door in case of emergency.
Fail soft is selective termination of affected non-essential system functions and processes when a
failure occurs or is detected in the system.
Fail Over is a redundancy mechanism and does not apply to this question.
According to the Official ISC2 Study Guide (OIG):
Fault Tolerance is defined as built-in capability of a system to provide continued correct execution
in the presence of a limited number of hardware or software faults. It means a system can operate
in the presence of hardware component failures. A single component failure in a fault-tolerant
system will not cause a system interruption because the alternate component will take over the
task transparently. As the cost of components continues to drop, and the demand for system
availability increases, many non-fault-tolerant systems have redundancy built-in at the subsystem
level. As a result, many non-fault-tolerant systems can tolerate hardware faults - consequently, the
line between a fault-tolerant system and a non-fault-tolerant system becomes increasingly blurred.
According to Common Criteria:
Fail Secure - Failure with preservation of secure state, which requires that the TSF (TOE security
functions) preserve a secure state in the face of the identified failures.
Acc. to The CISSP Prep Guide, Gold Ed.:
Fail over - When one system/application fails, operations will automatically switch to the backup
system.
Fail safe - Pertaining to the automatic protection of programs and/or processing systems to
maintain safety when a hardware or software failure is detected in a system.
Fail secure - The system preserves a secure state during and after identified failures occur.
Fail soft - Pertaining to the selective termination of affected non-essential processing when a
hardware or software failure is detected in a system.
Acc. to CISSP for Dummies:
Fail closed - A control failure that results all accesses blocked.
Fail open - A control failure that results in all accesses permitted.
Failover - A failure mode where, if a hardware or software failure is detected, the system
automatically transfers processing to a hot backup component, such as a clustered server.
Fail-safe - A failure mode where, if a hardware or software failure is detected, program execution
is terminated, and the system is protected from compromise.
Fail-soft (or resilient) - A failure mode where, if a hardware or software failure is detected, certain,
noncritical processing is terminated, and the computer or network continues to function in a
degraded mode.
Fault-tolerant - A system that continues to operate following failure of a computer or network
component.
It's good to differentiate this concept in Physical Security as well:
Fail-safe
Door defaults to being unlocked
Dictated by fire codes
Fail-secure
Door defaults to being locked
Reference(s) used for this question:
SHIREY, Robert W., RFC2828: Internet Security Glossary, may 2000.
NEW QUESTION: 2
A. Option A
B. Option E
C. Option C
D. Option D
E. Option B
Answer: A,D,E
NEW QUESTION: 3
HOTSPOT
Your network contains an Active Directory forest. The forest contains two sites named Site1 and Site2.
You have an Exchange Server 2013 organization. Site1 contains two Mailbox servers and one Client Access server. Site2 contains two Mailbox servers and two Client Access servers.
You need to prevent messages that cannot be protected by shadow redundancy from being delivered.
What command should you run? (To answer, select the appropriate options in the answer area.)
Answer:
Explanation: