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NEW QUESTION: 1
Secure Sockets Layer (SSL) uses a Message Authentication Code (MAC) for what purpose?
A. message confidentiality.
B. message interleave checking.
C. message non-repudiation.
D. message integrity.
Answer: D
Explanation:
A keyed hash also called a MAC (message authentication code) is used for integrity protection and authenticity.
In cryptography, a message authentication code (MAC) is a generated value used to authenticate a message. A MAC can be generated by HMAC or CBC-MAC methods. The MAC protects both a message's integrity (by ensuring that a different MAC will be produced if the message has changed) as well as its authenticity, because only someone who knows the secret key could have modified the message.
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.
HMAC When using HMAC the symmetric key of the sender would be concatenated (added at the end) with the message. The result of this process (message + secret key) would be put through a hashing algorithm, and the result would be a MAC value. This MAC value is then appended to the message being sent. If an enemy were to intercept this message and modify it, he would not have the necessary symmetric key to create a valid MAC value. The receiver would detect the tampering because the MAC value would not be valid on the receiving side.
CBC-MAC If a CBC-MAC is being used, the message is encrypted with a symmetric block cipher in CBC mode, and the output of the final block of ciphertext is used as the MAC. The sender does not send the encrypted version of the message, but instead sends the plaintext version and the MAC attached to the message. The receiver receives the plaintext message and encrypts it with the same symmetric block cipher in CBC mode and calculates an independent MAC value. The receiver compares the new MAC value with the MAC value sent with the message. This method does not use a hashing algorithm as does HMAC.
Cipher-Based Message Authentication Code (CMAC) Some security issues with CBC-MAC were found and they created Cipher-Based Message Authentication Code (CMAC) as a replacement. CMAC provides the same type of data origin authentication and integrity as CBC-MAC, but is more secure mathematically. CMAC is a variation of CBC-MAC. It is approved to work with AES and Triple DES. HMAC, CBC-
MAC, and CMAC work higher in the network stack and can identify not only transmission
errors (accidental), but also more nefarious modifications, as in an attacker messing with a
message for her own benefit. This means all of these technologies can identify intentional,
unauthorized modifications and accidental changes- three in one.
The following are all incorrect answers:
"Message non-repudiation" is incorrect.
Nonrepudiation is the assurance that someone cannot deny something. Typically,
nonrepudiation refers to the ability to ensure that a party to a contract or a communication
cannot deny the authenticity of their signature on a document or the sending of a message
that they originated.
To repudiate means to deny. For many years, authorities have sought to make repudiation
impossible in some situations. You might send registered mail, for example, so the
recipient cannot deny that a letter was delivered. Similarly, a legal document typically
requires witnesses to signing so that the person who signs cannot deny having done so.
On the Internet, a digital signature is used not only to ensure that a message or document
has been electronically signed by the person that purported to sign the document, but also,
since a digital signature can only be created by one person, to ensure that a person cannot
later deny that they furnished the signature.
"Message confidentiality" is incorrect. The Message confidentiality is protected by
encryption not by hashing algorithms.
"Message interleave checking" is incorrect. This is a nonsense term included as a
distractor.
Reference(s) used for this question:
Harris, Shon (2012-10-25). CISSP All-in-One Exam Guide, 6th Edition (p. 1384). McGraw-
Hill. Kindle Edition.
and
http://csrc.nist.gov/publications/nistpubs/800-38B/SP_800-38B.pdf
and
http://searchsecurity.techtarget.com/definition/nonrepudiation
and
https://en.wikipedia.org/wiki/Message_authentication_code
NEW QUESTION: 2
A technician has set a laptop display to a resolution that was not supported and now cannot see the desktop. Which of the following diagnostic options would the technician choose to correct the issue?
A. Restore from backup
B. Driver rollback
C. Recovery console
D. VGA mode
Answer: D
NEW QUESTION: 3
ABC Manufacturing Company ships merchandise U s $40.000 on consignment to XYZ Stores. ABC pays US $3,000 of freight costs to a transport company, and XYZ pays US $2,000 for local advertising costs that are reimbursable from ABC. By the end of the period the three, fourths of the consigned merchandise has been sold for US $50,000 cash. XYZ notifies ABC of the sales, retains a 10% commission and the paid advertising costs and remits the cash due ABC. Select the journal entry that appropriately records the notification of sale and the receipt of cash by ABC.
A. Cash US $40,000 Revenue from consignment sales US $50,000
B. Cash US $40,000 Advertising expense 2,000 Commission expense 5,000 Freight expense 3,000 Revenue from consignment sales US $50,000
C. Cash US $43,000 Advertising expense 2,000 Commission expense 5,000 Revenue from consignment sales US $50,000
D. Cash US $40,000 Commission expense 5,000 Revenue from consignment sales US $50,000
Answer: C
Explanation:
ABC debits the cash received US $43,000 [$50,000 sales - $2,000 advertising -$50,000 $10) sales commission]. The advertising and commission expenses are debited for $2,000 and $5,000, respectively. Finally, US $50,000 of gross revenue is credited.
NEW QUESTION: 4
HOTSPOT
Background
You manage a Microsoft SQL Server environment that includes the following databases: DB1, DB2, Reporting.
The environment also includes SQL Reporting Services (SSRS) and SQL Server Analysis Services (SSAS). All SSRS and SSAS servers use named instances. You configure a firewall rule for SSAS.
Databases
Database Name:
DB1
Notes:
This database was migrated from SQL Server 2012 to SQL Server 2016. Thousands of records are inserted into DB1 or updated each second. Inserts are made by many different external applications that your company's developers do not control. You observe that transaction log write latency is a bottleneck in performance. Because of the transient nature of all the data in this database, the business can tolerate some data loss in the event of a server shutdown.
Database Name:
DB2
Notes:
This database was migrated from SQL Server 2012 to SQL Server 2016. Thousands of records are updated or inserted per second. You observe that the WRITELOG wait type is the highest aggregated wait type. Most writes must have no tolerance for data loss in the event of a server shutdown. The business has identified certain write queries where data loss is tolerable in the event of a server shutdown.
Database Name:
Reporting
Notes:
You create a SQL Server-authenticated login named BIAppUser on the SQL Server instance to support users of the Reporting database. The BIAppUser login is not a member of the sysadmin role.
You plan to configure performance-monitoring alerts for this instance by using SQL Agent Alerts.
You need to open the firewall ports for use with SQL Server environment.
In table below, identify the firewall port that you must use for each service.
NOTE: Make only one selection in each column.
Hot Area:
Answer:
Explanation:
Explanation/Reference:
Explanation:
Report Server: 80
By default, the report server listens for HTTP requests on port 80.
Incorrect Answers:
Not 1433: If you are accessing SQL Server relational databases on external computers, or if the report server database is on an external SQL Server instance, you must open port 1433 and 1434 on the external computer. In this scenario there is no mention of an external server.
SQL Server Browser service for SSAS: 1433
How SQL Server Browser Works
When an instance of SQL Server starts, if the TCP/IP protocol is enabled for SQL Server, the server is assigned a TCP/IP port. If the named pipes protocol is enabled, SQL Server listens on a specific named pipe. This port, or "pipe," is used by that specific instance to exchange data with client applications. During installation, TCP port 1433 and pipe \sql\query are assigned to the default instance, References:
https://msdn.microsoft.com/en-us/library/bb934283.aspx
https://technet.microsoft.com/en-us/library/ms181087(v=sql.130).aspx
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