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NEW QUESTION: 1
Which of the following BEST describes a function relying on a shared secret key that is used along with a hashing algorithm to verify the integrity of the communication content as well as the sender?
A. Message Authentication Code - MAC
B. Digital Signature Certificate
C. PAM - Pluggable Authentication Module
D. NAM - Negative Acknowledgement Message
Answer: A
Explanation:
The purpose of a message authentication code - MAC is to verify both the source and message integrity without the need for additional processes.
A MAC algorithm, sometimes called a keyed (cryptographic) hash function (however, cryptographic hash function is only one of the possible ways to generate MACs), accepts as input a secret key and an arbitrary-length message to be authenticated, and outputs a MAC (sometimes known as a tag). The MAC value protects both a message's data integrity as well as its authenticity, by allowing verifiers (who also possess the secret key) to detect any changes to the message content.
MACs differ from digital signatures as MAC values are both generated and verified using the same secret key. This implies that the sender and receiver of a message must agree on the same key before initiating communications, as is the case with symmetric encryption. For the same reason, MACs do not provide the property of non-repudiation offered by signatures specifically in the case of a network-wide shared secret key: any user who can verify a MAC is also capable of generating MACs for other messages.
In contrast, a digital signature is generated using the private key of a key pair, which is asymmetric encryption. Since this private key is only accessible to its holder, a digital signature proves that a document was signed by none other than that holder. Thus, digital signatures do offer non-repudiation.
The following answers are incorrect:
PAM - Pluggable Authentication Module: This isn't the right answer. There is no known message authentication function called a PAM. However, a pluggable authentication module (PAM) is a mechanism to integrate multiple low-level authentication schemes and commonly used within the Linux Operating System.
NAM - Negative Acknowledgement Message: This isn't the right answer. There is no known message authentication function called a NAM. The proper term for a negative acknowledgement is NAK, it is a signal used in digital communications to ensure that data is received with a minimum of errors.
Digital Signature Certificate: This isn't right. As it is explained and contrasted in the explanations provided above.
The following reference(s) was used to create this question:
The CCCure Computer Based Tutorial for Security+, you can subscribe at http://www.cccure.tv and http://en.wikipedia.org/wiki/Message_authentication_code
Topic 6, Network and Telecommunications
NEW QUESTION: 2
Note: This question is part of a series of questions that use the same scenario. For your convenience, the scenario is repeated in each question. Each question presents a different goal and answer choices, but the text of the scenario is exactly the same in each question in this series.
You have a database named DB1 that contains the following tables: Customer, CustomerToAccountBridge, and CustomerDetails. The three tables are part of the Sales schema. The database also contains a schema named Website. You create the Customer table by running the following Transact-SQL statement:
The value of the CustomerStatus column is equal to one for active customers. The value of the Account1Status and Account2Status columns are equal to one for active accounts. The following table displays selected columns and rows from the Customer table.
You plan to create a view named Website.Customer and a view named Sales.FemaleCustomers.
Website.Customer must meet the following requirements:
* Allow users access to the CustomerName and CustomerNumber columns for active customers.
* Allow changes to the columns that the view references. Modified data must be visible through the view.
* Prevent the view from being published as part of Microsoft SQL Server replication.
Sales.Female.Customers must meet the following requirements:
* Allow users access to the CustomerName, Address, City, State and PostalCode columns.
* Prevent changes to the columns that the view references.
* Only allow updates through the views that adhere to the view filter.
You have the following stored procedures: spDeleteCustAcctRelationship and spUpdateCustomerSummary.
The spUpdateCustomerSummary stored procedure was created by running the following Transacr-SQL statement:
You run the spUpdateCustomerSummary stored procedure to make changes to customer account summaries.
Other stored procedures call the spDeleteCustAcctRelationship to delete records from the CustomerToAccountBridge table.
You must update the design of the Customer table to meet the following requirements.
* You must be able to store up to 50 accounts for each customer.
* Users must be able to retrieve customer information by supplying an account number.
* Users must be able to retrieve an account number by supplying customer information.
You need to implement the design changes while minimizing data redundancy.
What should you do?
A. Split the table into three separate tables. Include the AccountNumber and CustomerID columns in the first table. Include the CustomerName and Gender columns in the second table. Include the AccountStatus column in the third table.
B. Split the table into two separate tables, Include the CustomerID, CustomerName and Gender columns in the first table. IncludeAccountNumber, AccountStatus and CustomerID columns in the second table.
C. Split the table into two separate tables, Include the CustomerID and AccountNumber columns in the first table. Include the AccountNumber, AccountStatus, CustomerName and Gender columns in the second table.
D. Split the table into two separate tables. Include AccountNumber, CustomerID, CustomerName and Gender columns in the first table. Include the AccountNumber and AccountStatus columns in the second table.
Answer: B
Explanation:
Explanation
Two tables are enough. CustomerID must be in both tables.
NEW QUESTION: 3
You need to recommend a database strategy to support the planned new customers. The solution must minimize costs.
What should you recommend?
A. 30 Premium P14 databases
B. A Premium database pool that has at least 1.000 eDTUs
C. 30 Basic databases
D. A Basic database pool that has at least 1.200 eDTUs
Answer: D
Explanation:
Explanation/Reference:
Explanation:
Scenario: Planned changes
Relecloud plans to move all of its customers to a delivery model that uses Azure SQL Database and plans to maintain a single database for each customer.
Relecloud plans to automate the process of creating the required infrastructure for each new customer, including the process of loading data to the customer databases.
Relecloud plans to onboard 30 new customer accounts during the next year. The data for the new customers is approximately 10 GB and has a static size. The new customers require a rapid response time to database queries and each customer has five to 10 concurrent logins.
Incorrect Answers:
B: A premium database pool would be more costly.
Reference: https://azure.microsoft.com/en-us/pricing/calculator/?service=sql-database