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Which of the following control provides an alternative measure of control?
A. Deterrent
B. Compensating
C. Preventive
D. Detective
正解：B
解説：
Section: The process of Auditing Information System
Explanation:
For your exam you should know below information about different security controls
Deterrent Controls
Deterrent Controls are intended to discourage a potential attacker. Access controls act as a deterrent to
threats and attacks by the simple fact that the existence of the control is enough to keep some potential
attackers from attempting to circumvent the control. This is often because the effort required to circumvent
the control is far greater than the potential reward if the attacker is successful, or, conversely, the negative
implications of a failed attack (or getting caught) outweigh the benefits of success. For example, by forcing
the identification and authentication of a user, service, or application, and all that it implies, the potential for
incidents associated with the system is significantly reduced because an attacker will fear association with
the incident. If there are no controls for a given access path, the number of incidents and the potential
impact become infinite. Controls inherently reduce exposure to risk by applying oversight for a process.
This oversight acts as a deterrent, curbing an attacker's appetite in the face of probable repercussions.
The best example of a deterrent control is demonstrated by employees and their propensity to intentionally
perform unauthorized functions, leading to unwanted events. When users begin to understand that by
authenticating into a system to perform a function, their activities are logged and monitored, and it reduces
the likelihood they will attempt such an action. Many threats are based on the anonymity of the threat
agent, and any potential for identification and association with their actions is avoided at all costs. It is this
fundamental reason why access controls are the key target of circumvention by attackers. Deterrents also
take the form of potential punishment if users do something unauthorized. For example, if the organization
policy specifies that an employee installing an unauthorized wireless access point will be fired, that will
determine most employees from installing wireless access points.
Preventative Controls
Preventive controls are intended to avoid an incident from occurring. Preventative access controls keep a
user from performing some activity or function. Preventative controls differ from deterrent controls in that
the control is not optional and cannot (easily) be bypassed. Deterrent controls work on the theory that it is
easier to obey the control
rather than to risk the consequences of bypassing the control. In other words, the power for action resides
with the user (or the attacker). Preventative controls place the power of action with the system, obeying the
control is not optional. The only way to bypass the control is to
find a flaw in the control's implementation.
Compensating Controls
Compensating controls are introduced when the existing capabilities of a system do not support the
requirement of a policy. Compensating controls can be technical, procedural, or managerial. Although an
existing system may not support the required controls, there may exist other
technology or processes that can supplement the existing environment, closing the gap in controls, meeting
policy requirements, and reducing overall risk. For example, the access control policy may state that the
authentication process must be encrypted when performed over the Internet. Adjusting an application to
natively support encryption for authentication purposes may be too costly. Secure Socket Layer (SSL), an
encryption protocol, can be employed and layered on top of the authentication process to support the policy
statement. Other examples include a separation of duties environment, which offers the capability to isolate
certain tasks to compensate for technical limitations in the system and ensure the security of transactions.
In addition, management processes, such as authorization, supervision, and administration, can be used to
compensate for gaps in the access control environment.
Detective Controls
Detective controls warn when something has happened, and are the earliest point in the post-incident
timeline. Access controls are a deterrent to threats and can be aggressively utilized to prevent harmful
incidents through the application of least privilege. However, the detective
nature of access controls can provide significant visibility into the access environment and help
organizations manage their access strategy and related security risk. As mentioned previously, strongly
managed access privileges provided to an authenticated user offer the ability to reduce the risk exposure of
the enterprise's assets by limiting the capabilities that authenticated user has. However, there are few
options to control what a user can perform once privileges are provided. For example, if a user is provided
write access to a file and that file is damaged, altered, or otherwise negatively impacted (either deliberately
or unintentionally), the use of applied access controls will offer visibility into the transaction. The control
environment can be established to log activity regarding the identification, authentication, authorization, and
use of privileges on a system. This can be used to detect the occurrence of errors, the attempts to perform
an unauthorized action, or to validate when provided credentials were exercised. The logging system as a
detective device provides evidence of actions (both successful and unsuccessful) and tasks that were
executed by authorized users.
Corrective Controls
When a security incident occurs, elements within the security infrastructure may require corrective actions.
Corrective controls are actions that seek to alter the security posture of an environment to correct any
deficiencies and return the environment to a secure state. A security
incident signals the failure of one or more directive, deterrent, preventative, or compensating controls. The
detective controls may have triggered an alarm or notification, but now the corrective controls must work to
stop the incident in its tracks. Corrective controls can take
many forms, all depending on the particular situation at hand or the particular security failure that needs to
be dealt with.
Recovery Controls
Any changes to the access control environment, whether in the face of a security incident or to offer
temporary compensating controls, need to be accurately reinstated and returned to normal operations.
There are several situations that may affect access controls, their applicability, status, or management.
Events can include system outages, attacks, project changes, technical demands, administrative gaps, and
full-blown disaster situations. For example, if an application is not correctly installed or deployed, it may
adversely affect controls placed on system files or even have default administrative accounts unknowingly
implemented upon install. Additionally, an employee may be transferred, quit, or be on temporary leave that
may affect policy requirements regarding separation of duties. An attack on systems may have resulted in
the implantation of a Trojan horse program, potentially exposing private user information, such as credit
card information and financial data. In all of these cases, an undesirable situation must be rectified as
quickly as possible and controls returned to normal operations.
For your exam you should know below information about different security controls
Deterrent Controls
Deterrent Controls are intended to discourage a potential attacker. Access controls act as a deterrent to
threats and attacks by the simple fact that the existence of the control is enough to keep some potential
attackers from attempting to circumvent the control. This is often because the effort required to circumvent
the control is far greater than the potential reward if the attacker is successful, or, conversely, the negative
implications of a failed attack (or getting caught) outweigh the benefits of success. For example, by forcing
the identification and authentication of a user, service, or application, and all that it implies, the potential for
incidents associated with the system is significantly reduced because an attacker will fear association with
the incident. If there are no controls for a given access path, the number of incidents and the potential
impact become infinite. Controls inherently reduce exposure to risk by applying oversight for a process.
This oversight acts as a deterrent, curbing an attacker's appetite in the face of probable repercussions.
The best example of a deterrent control is demonstrated by employees and their propensity to intentionally
perform unauthorized functions, leading to unwanted events.
When users begin to understand that by authenticating into a system to perform a function, their activities
are logged and monitored, and it reduces the likelihood they will attempt such an action. Many threats are
based on the anonymity of the threat agent, and any potential for identification and association with their
actions is avoided at all costs.
It is this fundamental reason why access controls are the key target of circumvention by attackers.
Deterrents also take the form of potential punishment if users do something unauthorized. For example, if
the organization policy specifies that an employee installing an unauthorized wireless access point will be
fired, that will determine most employees from installing wireless access points.
Preventative Controls
Preventive controls are intended to avoid an incident from occurring. Preventative access controls keep a
user from performing some activity or function. Preventative controls differ from deterrent controls in that
the control is not optional and cannot (easily) be bypassed. Deterrent controls work on the theory that it is
easier to obey the control
rather than to risk the consequences of bypassing the control. In other words, the power for action resides
with the user (or the attacker). Preventative controls place the power of action with the system, obeying the
control is not optional. The only way to bypass the control is to find a flaw in the control's implementation.
Compensating Controls
Compensating controls are introduced when the existing capabilities of a system do not support the
requirement of a policy. Compensating controls can be technical, procedural, or managerial. Although an
existing system may not support the required controls, there may exist other technology or processes that
can supplement the existing environment, closing the gap in controls, meeting policy requirements, and
reducing overall risk.
For example, the access control policy may state that the authentication process must be encrypted when
performed over the Internet. Adjusting an application to natively support encryption for authentication
purposes may be too costly. Secure Socket Layer (SSL), an encryption protocol, can be employed and
layered on top of the authentication process to support the policy statement.
Other examples include a separation of duties environment, which offers the capability to isolate certain
tasks to compensate for technical limitations in the system and ensure the security of transactions. In
addition, management processes, such as authorization, supervision, and administration, can be used to
compensate for gaps in the access control environment.
Detective Controls
Detective controls warn when something has happened, and are the earliest point in the post-incident
timeline. Access controls are a deterrent to threats and can be aggressively utilized to prevent harmful
incidents through the application of least privilege. However, the detective nature of access controls can
provide significant visibility into the access environment and help organizations manage their access
strategy and related security risk.
As mentioned previously, strongly managed access privileges provided to an authenticated user offer the
ability to reduce the risk exposure of the enterprise's assets by limiting the capabilities that authenticated
user has. However, there are few options to control what a user can perform once privileges are provided.
For example, if a user is provided write access to a file and that file is damaged, altered, or otherwise
negatively impacted (either deliberately or unintentionally), the use of applied access controls will offer
visibility into the transaction. The control environment can be established to log activity regarding the
identification, authentication, authorization, and use of privileges on a system.
This can be used to detect the occurrence of errors, the attempts to perform an unauthorized action, or to
validate when provided credentials were exercised. The logging system as a detective device provides
evidence of actions (both successful and unsuccessful) and tasks that were executed by authorized users.
Corrective Controls
When a security incident occurs, elements within the security infrastructure may require corrective actions.
Corrective controls are actions that seek to alter the security posture of an environment to correct any
deficiencies and return the environment to a secure state. A security incident signals the failure of one or
more directive, deterrent, preventative, or compensating controls. The detective controls may have
triggered an alarm or notification, but now the corrective controls must work to stop the incident in its
tracks. Corrective controls can take many forms, all depending on the particular situation at hand or the
particular security failure that needs to be dealt with.
Recovery Controls
Any changes to the access control environment, whether in the face of a security incident or to offer
temporary compensating controls, need to be accurately reinstated and returned to normal operations.
There are several situations that may affect access controls, their applicability, status, or management.
Events can include system outages, attacks, project changes, technical demands, administrative gaps, and
full-blown disaster situations. For example, if an application is not correctly installed or deployed, it may
adversely affect controls placed on system files or even have default administrative accounts unknowingly
implemented upon install.
Additionally, an employee may be transferred, quit, or be on temporary leave that may affect policy
requirements regarding separation of duties. An attack on systems may have resulted in the implantation of
a Trojan horse program, potentially exposing private user information, such as credit card information and
financial data. In all of these cases, an undesirable situation must be rectified as quickly as possible and
controls returned to normal operations.
The following answers are incorrect:
Deterrent - Deterrent controls are intended to discourage a potential attacker
Preventive - Preventive controls are intended to avoid an incident from occurring
Detective -Detective control helps identify an incident's activities and potentially an intruder
The following reference(s) were/was used to create this question:
CISA Review Manual 2014 Page number 44
and
Official ISC2 CISSP guide 3rd edition Page number 50 and 51
質問 # 1316
Which of the following layer of an enterprise data flow architecture does the scheduling of the tasks necessary to build and maintain the Data Warehouse (DW) and also populates Data Marts?
A. Data preparation layer
B. Warehouse management layer
C. Data access layer
D. Desktop Access Layer
正解：B
解説：
Section: Information System Acquisition, Development and Implementation Explanation:
Warehouse Management Layer - The function of this layer is the scheduling of the tasks necessary to build and maintain the DW and populate data marts. This layer is also involved in administration of security.
For CISA exam you should know below information about business intelligence:
Business intelligence(BI) is a broad field of IT encompasses the collection and analysis of information to assist decision making and assess organizational performance. To deliver effective BI, organizations need to design and implement a data architecture. The complete data architecture consists of two components The enterprise data flow architecture (EDFA) A logical data architecture Various layers/components of this data flow architecture are as follows:
Presentation/desktop access layer - This is where end users directly deal with information. This layer includes familiar desktop tools such as spreadsheets, direct querying tools, reporting and analysis suits offered by vendors such as Congas and business objects, and purpose built application such as balanced source cards and digital dashboards.
Data Source Layer - Enterprise information derives from number of sources:
Operational data - Data captured and maintained by an organization's existing systems, and usually held in system-specific database or flat files.
External Data - Data provided to an organization by external sources. This could include data such as customer demographic and market share information.
Nonoperational data - Information needed by end user that is not currently maintained in a computer accessible format.
Core data warehouse - This is where all the data of interest to an organization is captured and organized to assist reporting and analysis. DWs are normally instituted as large relational databases. A property constituted DW should support three basic form of an inquiry.
Drilling up and drilling down - Using dimension of interest to the business, it should be possible to aggregate data as well as drill down. Attributes available at the more granular levels of the warehouse can also be used to refine the analysis.
Drill across - Use common attributes to access a cross section of information in the warehouse such as sum sales across all product lines by customer and group of customers according to length of association with the company.
Historical Analysis - The warehouse should support this by holding historical, time variant data. An example of historical analysis would be to report monthly store sales and then repeat the analysis using only customer who were preexisting at the start of the year in order to separate the effective new customer from the ability to generate repeat business with existing customers.
Data Mart Layer - Data mart represents subset of information from the core DW selected and organized to meet the needs of a particular business unit or business line. Data mart can be relational databases or some form on-line analytical processing (OLAP) data structure.
Data Staging and quality layer - This layer is responsible for data copying, transformation into DW format and quality control. It is particularly important that only reliable data into core DW. This layer needs to be able to deal with problems periodically thrown by operational systems such as change to account number format and reuse of old accounts and customer numbers.
Data Access Layer - This layer operates to connect the data storage and quality layer with data stores in the data source layer and, in the process, avoiding the need to know to know exactly how these data stores are organized. Technology now permits SQL access to data even if it is not stored in a relational database.
Data Preparation layer - This layer is concerned with the assembly and preparation of data for loading into data marts. The usual practice is to per-calculate the values that are loaded into OLAP data repositories to increase access speed. Data mining is concern with exploring large volume of data to determine patterns and trends of information. Data mining often identifies patterns that are counterintuitive due to number and complexity of data relationships. Data quality needs to be very high to not corrupt the result.
Metadata repository layer - Metadata are data about data. The information held in metadata layer needs to extend beyond data structure names and formats to provide detail on business purpose and context. The metadata layer should be comprehensive in scope, covering data as they flow between the various layers, including documenting transformation and validation rules.
Warehouse Management Layer - The function of this layer is the scheduling of the tasks necessary to build and maintain the DW and populate data marts. This layer is also involved in administration of security.
Application messaging layer - This layer is concerned with transporting information between the various layers. In addition to business data, this layer encompasses generation, storage and targeted communication of control messages.
Internet/Intranet layer - This layer is concerned with basic data communication. Included here are browser based user interface and TCP/IP networking.
Various analysis models used by data architects/ analysis follows:
Activity or swim-lane diagram - De-construct business processes.
Entity relationship diagram - Depict data entities and how they relate. These data analysis methods obviously play an important part in developing an enterprise data model. However, it is also crucial that knowledgeable business operative is involved in the process. This way proper understanding can be obtained of the business purpose and context of the data. This also mitigates the risk of replication of suboptimal data configuration from existing systems and database into DW.
The following were incorrect answers:
Desktop access layer or presentation layer is where end users directly deal with information. This layer includes familiar desktop tools such as spreadsheets, direct querying tools, reporting and analysis suits offered by vendors such as Congas and business objects, and purpose built application such as balanced source cards and digital dashboards.
Data preparation layer - This layer is concerned with the assembly and preparation of data for loading into data marts. The usual practice is to per-calculate the values that are loaded into OLAP data repositories to increase access speed.
Data access layer - his layer operates to connect the data storage and quality layer with data stores in the data source layer and, in the process, avoiding the need to know to know exactly how these data stores are organized. Technology now permits SQL access to data even if it is not stored in a relational database.
Reference:
CISA review manual 2014 Page number 188
質問 # 1317
Which of the following message services provides the strongest evidence that a specific action has occurred?
A. Message origin authentication
B. Nonrepudiation
C. Proof of submission
D. Proof of delivery
正解：B
解説：
Explanation/Reference:
Explanation:
Nonrepudiation services provide evidence that a specific action occurred. Nonrepudiation services are similar to their weaker proof counterparts, i.e., proof of submission, proof of delivery and message origin authentication. However, nonrepudiationprovides stronger evidence because the proof can be demonstrated to a third party. Digital signatures are used to provide nonrepudiation. Message origination authentication will only confirm the source of the message and does not confirm the specificaction that has been completed.
質問 # 1318
Which of the following provides the BEST overview of an organization's audit universe when developing a long-term audit plan?
A. Logical data architecture
B. IT strategy
C. Risk register
D. Enterprise architecture (EA)
正解：C
質問 # 1319
Which of the following is a benefit of requiring management to issue a report to stakeholders regarding the internal controls over IT?
A. Improved cost management
B. Focus on IT governance
C. Improved portfolio management
D. Transparency of IT costs
正解：B
解説：
Section: Governance and Management of IT
質問 # 1320
......
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