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NEW QUESTION: 1
A database view is the results of which of the following operations?
A. Join, Project, and Select.
B. Join, Project, and Create.
C. Join, Insert, and Project.
D. Join and Select.
Answer: A
Explanation:
1 The formal description of how a relational database operates.
2 The mathematics which underpin SQL operations.
A number of operations can be performed in relational algebra to build relations and operate on
the data.
Five operations are primitives (Select, Project, Union, Difference and Product) and the other
operations can be defined in terms of those five. A View is defined from the operations of Join,
Project, and Select.
For the purpose of the exam you must remember the following terms from relational algebra and
their SQL equivalent:
Tuple = Row, Entry
Attribute = Column
Relation or Based relation = Table
See the extract below from the ISC2 book:
Each table, or relation, in the relational model consists of a set of attributes and a set of tuples
(rows) or entries in the table. Attributes correspond to a column in a table. Attributes are unordered
left to right, and thus are referenced by name and not by position. All data values in the relational
model are atomic. Atomic values mean that at every row/column position in every table there is
always exactly one data value and never a set of values. There are no links or pointers connecting
tables; thus, the representation of relationships is contained as data in another table.
A tuple of a table corresponds to a row in the table. Tuples are unordered top to bottom because a
relation is a mathematical set and not a list. Also, because tuples are based on tables that are
mathematical sets, there are no duplicate tuples in a table (sets in mathematics by definition do
not include duplicate elements).
The primary key is an attribute or set of attributes that uniquely identifies a specific instance of an
entity. Each table in a database must have a primary key that is unique to that table. It is a subset
of the candidate key.
Reference used for this question:
Hernandez CISSP, Steven (2012-12-21). Official (ISC)2 Guide to the CISSP CBK, Third Edition
((ISC)2 Press) (Kindle Locations 12262-12269). Auerbach Publications. Kindle Edition.
and
KRUTZ, Ronald L. & VINES, Russel D., The CISSP Prep Guide: Mastering the Ten Domains of
Computer Security, 2001, John Wiley & Sons, Page 46
and
http://db.grussell.org/slides/rel%20algebra%201ppt
NOTE:
SQL offers three classes of operators: select, project, and join.
The select operator serves to shrink the table vertically by eliminating unwanted rows (tuples).
The project operator serves to shrink the table horizontally by removing unwanted columns
(attributes).
And the join operator allows the dynamic linking of two tables that share a common column value.
The join operation is achieved by stating the selection criteria for two tables and equating them
with their common columns.
Most commercial implementations of SQL do not support a project operation, instead projections are achieved by specifying the columns desired in the output. This is why the Project operator is not well known as it is fading away from most databases.

NEW QUESTION: 2
A technician is tasked with performing a room readiness assessment in preparation for an
immersive video endpoint. What are three Cisco best practices regarding lighting recommendations for the room? (Choose three.)
A. Key lighting should be between 200 and 400 Lux with the endpoint powered on.
B. The bulb temperature should be between 4000 and 4100K.
C. Shoulder lighting should not exceed two times the facial lighting values with the endpoint off.
D. Avoid using dimming light control systems.
E. Within the camera field of view, the lighting for all parts of the room should not fluctuate more than 100 Lux.
F. Use direct lighting fixtures.
Answer: B,C,E

NEW QUESTION: 3



A. Option B
B. Option D
C. Option C
D. Option A
Answer: B
Explanation:
The New-AzureQuickVM cmdlet sets the configuration for a new virtual machine and creates the virtual machine. You can create a new Azure service for the virtual machine by specifying either the Location or AffinityGroup parameters, or deploy the new virtual machine into an existing service.
AdminUsername is not required.

References:
https://msdn.microsoft.com/en-us/library/azure/dn495183.aspx

NEW QUESTION: 4
Service Consumer A sends a request message with an authentication token to Service A, but before the message reaches Service A, it is intercepted by Service Agent A (1). Service Agent A validates the security credentials and also validates whether the message is compliant with Security Policy A.
If either validation fails, Service Agent A rejects the request message and writes an error log to Database A (2A). If both validations succeed, the request message is sent to Service A (2B).
Service A retrieves additional data from a legacy system (3) and then submits a request message to Service B Before arriving at Service B, the request message is intercepted by Service Agent B (4) which validates its compliance with Security Policy SIB then Service Agent C (5) which validates its compliance with Security Policy B.
If either of these validations fails, an error message is sent back to Service A.
that then forwards it to Service Agent A so that it the error can be logged in Database A (2A). If both validations succeed, the request message is sent to Service B (6). Service B subsequently stores the data from the message in Database B (7).
Service A and Service Agent A reside in Service Inventory A.
Service B and Service Agents B and C reside in Service Inventory B.
Security Policy SIB is used by all services that reside in Service Inventory B.
Service B can also be invoked by other service consumers from Service Inventory B.
Request messages sent by these service consumers must also be compliant with Security Policies SIB and B.

Access to the legacy system in Service Inventory A is currently only possible via Service A, which means messages must be validated for compliance with Security Policy A.
A new requirement has emerged to allow services from Service Inventory B to access the legacy system via a new perimeter service that will be dedicated to processing request messages from services residing in Service Inventory B.
Because the legacy system has no security features, all security processing will need to be carried out by the perimeter service.
However, there are parts of Security Policy A that are specific to Service A and do not apply to the legacy system or the perimeter service. Furthermore, response messages sent by the perimeter service to services from Service Inventory B will still need to be validated for compliance to Security Policy B and Security Policy SIB.
How can the Policy Centralization pattern be correctly applied without compromising the policy compliance requirements of services in both service inventories?
A. In order for Security Policy A to be centralized so that it can be shared by Service A and the new perimeter service, messages sent to the perimeter service from services in Service Inventory B will need to continue complying with Security Policy A, even if it requires that the messages contain content that does not relate to accessing the legacy system. In order to centralize Security Policy B it will need to be combined with Security Policy SIB, which means that the functionality within Service Agents B and C can be combined into a single service agent.
B. A single centralized security policy can be created by combining Security Policy A, Security Policy B.
and Security Policy SIB into a single security policy that is shared by services in both Service Inventory A and Service Inventory B.
This means that the new perimeter service can share the same new security policy with Service A.
This further simplifies message exchange processing because request messages sent by services in Service Inventory B to the new perimeter service need to comply to the same security policy as the response messages sent back by the perimeter service to the services in Service Inventory B.
C. Due to the amount of overlap among Security Policy A, Security Policy B, and Security Policy SIB, the Policy Centralization pattern cannot be correctly applied to enable the described message exchange between the perimeter service in Service Inventory A and services in Service Inventory B.
D. The parts of Security Policy A that are required for access to the new perimeter service need to be removed and placed into a new security policy that is shared by Service A and the perimeter service. Messages sent by services accessing the perimeter service from Service Inventory B will need to be compliant with the new security policy. Because the perimeter service is dedicated to message exchange with services from Service Inventory B, response messages sent by the perimeter service can be designed for compliance to Security Policy B and Security Policy SIB.
Answer: D