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NEW QUESTION: 1
A company's service for video game recommendations has just gone viral The company has new users from all over the world The website for the service is hosted on a set of Amazon EC2 instances in an Auto Scaling group behind an Application Load Balancer (ALB). The website consists of static content with different resources being loaded depending on the device type.
Users recently reported that the load time for the website has increased Administrators are reporting high loads on the EC2 instances that host the service.
Which set actions should a solutions architect take to improve response times?
A. Move content to Amazon S3 Create an Amazon CloudFront distribution to serve content out of the S3 bucket Use the User-Agent HTTP header to load different content
B. Create separate Auto Scaling groups based on device types Switch to a Network Load Balancer (NLB) Use the User-Agent HTTP header in the NLB to route to a different set of EC2 instances.
C. Move content to Amazon S3 Create an Amazon CloudFront distribution to serve content out of the S3 bucket Use Lambda@Edge to load different resources based on the User-Agent HTTP header
D. Create a separate ALB for each device type. Create one Auto Scaling group behind each ALB Use Amazon Route 53 to route to different ALBs depending on the User-Agent HTTP header
Answer: C
Explanation:
Explanation
https://docs.aws.amazon.com/AmazonCloudFront/latest/DeveloperGuide/RequestAndResponseBehaviorCustom

NEW QUESTION: 2
Testlet: Litware, Inc
You need to recommend a strategy for managing Windows Firewall that meets the company's technical requirements.
What should you include in the recommendation?
Case Study Title (Case Study): COMPANY OVERVIEW
Litware, Inc. is a manufacturing company that has a main office and two branch office.
The main office is located in Montreal. The branch offices are located in Seattle and New York.
The main office has 4,000 users. The branch offices each have 500 users.
PLANNED CHANGES
Litware plans to open a new sales office. The sales office will have a direct connection to the Internet. The sales office will have a single server.
The sales office requires a connection to the Montreal office. The connection to the Montreal office must use either TCP port 80 or TCP port 443.
The network currently contains a Fibre Channel Storage Area Network (SAN). A new iSCSI SAN will be implemented during the next month. The current SAN and the new SAN are from different manufacturers. Both SANs use a virtual disk service (VDS) interface.
EXISTING ENVIRONMENT
All servers run Windows Server 2008 R2. All client computers run Windows 7 Enterprise.
The main office has a single DHCP server. The IP addresses for all of the client computers must be assigned from the DHCP server.
All software is installed from a central software distribution point in the main office. Software deployments for the branch offices frequently fail due to bandwidth limitations.
Existing Active Directory/Directory Services
The network contains a single Active Directory domain named litwareinc.com. Each office has two domain controllers.
Current Administration Model
Currently, all help desk users have full administrator rights to the servers. The help desk users use Remote Desktop to log on to the servers and perform tasks such as managing Active Directory user accounts and creating DHCP reservations.
TECHNICAL REQUIREMENTS
Windows Firewall must be managed by using the minimum amount of administrative effort. Windows Firewall configurations must be duplicated easily between servers that have the same server role.
Litware must centralize the monitoring of critical system events. The monitoring solution must use the existing infrastructure.
Litware plans to prevent help desk users from interactively logging on to servers. Help desk users must not have full administrator rights to the servers.
The software deployment process must be updated to meet the following requirements:
Application source files must be centrally managed.
Software deployments to the offices in Seattle and New York must remain unaffected if a WAN link fails. The SANs must be administered by using a single tool.
A. System Starter Group Policy objects (GPOs)
B. Starter Group Policy objects (GPOs)
C. Domain-based Group Policy objects (GPOs)
D. Local Group Policy objects (GPOs)
Answer: C
Explanation:
Explanation
Explanation/Reference:
As the computer has a single domain, a domain-based GPO will be replicated to all computers/users in the same domain. WFAS will be configured in GPO.

NEW QUESTION: 3
Which access control model would a lattice-based access control model be an example of?
A. Mandatory access control.
B. Non-discretionary access control.
C. Rule-based access control.
D. Discretionary access control.
Answer: A
Explanation:
In a lattice model, there are pairs of elements that have the least upper bound of
values and greatest lower bound of values. In a Mandatory Access Control (MAC) model, users
and data owners do not have as much freedom to determine who can access files.
FIRST: The Lattice
A lattice is simply an access control tool usually used to implement Mandatory Access Control
(MAC) and it could also be used to implement RBAC but this is not as common. The lattice model
can be used for Integrity level or file permissions as well. The lattice has a least upper bound and
greatest lower bound. It makes use of pair of elements such as the subject security clearance
pairing with the object sensitivity label.
SECOND: DAC (Discretionary Access Control)
Let's get into Discretionary Access Control: It is an access control method where the owner (read
the creator of the object) will decide who has access at his own discretion. As we all know, users
are sometimes insane. They will share their files with other users based on their identity but
nothing prevent the user from further sharing it with other users on the network. Very quickly you
loose control on the flow of information and who has access to what. It is used in small and
friendly environment where a low level of security is all that is required.
THIRD: MAC (Mandatory Access Control)
All of the following are forms of Mandatory Access Control:
Mandatory Access control (MAC) (Implemented using the lattice)
You must remember that MAC makes use of Security Clearance for the subject and also Labels
will be assigned to the objects. The clearance of the Subject must dominate (be equal or higher)
the clearance of the Object being accessed. The label attached to the object will indicate the
sensitivity leval and the categories the object belongs to. The categories are used to implement
the Need to Know.
All of the following are forms of Non Discretionary Access Control:
Role Based Access Control (RBAC)
Rule Based Access Control (Think Firewall in this case)
The official ISC2 book says that RBAC (synonymous with Non Discretionary Access Control) is a
form of DAC but they are simply wrong. RBAC is a form of Non Discretionary Access Control. Non
Discretionary DOES NOT equal mandatory access control as there is no labels and clearance
involved.
I hope this clarifies the whole drama related to what is what in the world of access control.
In the same line of taught, you should be familiar with the difference between Explicit permission
(the user has his own profile) versus Implicit (the user inherit permissions by being a member of a
role for example).
The following answers are incorrect:
Discretionary access control. Is incorrect because in a Discretionary Access Control (DAC) model,
access is restricted based on the authorization granted to the users. It is identity based access
control only. It does not make use of a lattice.
Non-discretionary access control. Is incorrect because Non-discretionary Access Control (NDAC)
uses the role-based access control method to determine access rights and permissions. It is often
times used as a synonym to RBAC which is Role Based Access Control. The user inherit
permission from the role when they are assigned into the role. This type of access could make use
of a lattice but could also be implemented without the use of a lattice in some case. Mandatory
Access Control was a better choice than this one, but RBAC could also make use of a lattice. The
BEST answer was MAC.
Rule-based access control. Is incorrect because it is an example of a Non-discretionary Access
Control (NDAC) access control mode. You have rules that are globally applied to all users. There
is no such thing as a lattice being use in Rule-Based Access Control.
References:
AIOv3 Access Control (pages 161 - 168)
AIOv3 Security Models and Architecture (pages 291 - 293)

NEW QUESTION: 4
Which encryption algorithm does WPA use?
A. DH5
B. DES
C. RC4
D. AES
Answer: C
Explanation:
Explanation/Reference:
Explanation:
The RC4 Encryption Algorithm, developed by Ronald Rivest of RSA, is a shared key stream cipher algorithm requiring a secure exchange of a shared key. The symmetric key algorithm is used identically for encryption and decryption such that the data stream is simply XORed with the generated key sequence.
The algorithm is serial as it requires successive exchanges of state entries based on the key sequence.
Hence implementations can be very computationally intensive. The RC4 encryption algorithm is used by standards such as IEEE 802.11 within WEP (Wireless Encryption Protocol) using 40 and 128-bit keys.
Published procedures exist for cracking the security measures as implemented in WEP.
http://www.vocal.com/cryptography/rc4-encryption-algoritm/