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NEW QUESTION: 1
In an EMC Data Domain environment, what is a supported Extended Retention replication configuration?
A. Collection replication from the GDA to the Retention Unit
B. Directory replication from the GDA to the Retention Unit
C. MTree replication directly to the Retention Unit on the target
D. Collection replication from the active tier to the Retention Unit
Answer: D
NEW QUESTION: 2
Which of the following cryptographic attacks describes when the attacker has a copy of the plaintext and the corresponding ciphertext?
A. brute force
B. ciphertext only
C. chosen plaintext
D. known plaintext
Answer: D
Explanation:
The goal to this type of attack is to find the cryptographic key that was used to encrypt the message. Once the key has been found, the attacker would then be able to decrypt all messages that had been encrypted using that key.
The known-plaintext attack (KPA) or crib is an attack model for cryptanalysis where the attacker has samples of both the plaintext and its encrypted version (ciphertext), and is at liberty to make use of them to reveal further secret information such as secret keys and code books. The term "crib" originated at Bletchley Park, the British World War II decryption operation
In cryptography, a brute force attack or exhaustive key search is a strategy that can in theory be used against any encrypted data by an attacker who is unable to take advantage of any weakness in an encryption system that would otherwise make his task easier. It involves systematically checking all possible keys until the correct key is found. In the worst case, this would involve traversing the entire key space, also called search space.
In cryptography, a ciphertext-only attack (COA) or known ciphertext attack is an attack model for cryptanalysis where the attacker is assumed to have access only to a set of ciphertexts.
The attack is completely successful if the corresponding plaintexts can be deduced, or even better, the key. The ability to obtain any information at all about the underlying plaintext is still considered a success. For example, if an adversary is sending ciphertext continuously to maintain traffic-flow security, it would be very useful to be able to distinguish real messages from nulls. Even making an informed guess of the existence of real messages would facilitate traffic analysis.
In the history of cryptography, early ciphers, implemented using pen-and-paper, were routinely broken using ciphertexts alone. Cryptographers developed statistical techniques for attacking ciphertext, such as frequency analysis. Mechanical encryption devices such as Enigma made these attacks much more difficult (although, historically, Polish cryptographers were able to mount a successful ciphertext-only cryptanalysis of the Enigma by exploiting an insecure protocol for indicating the message settings).
Every modern cipher attempts to provide protection against ciphertext-only attacks. The vetting process for a new cipher design standard usually takes many years and includes exhaustive testing of large quantities of ciphertext for any statistical departure from random noise. See: Advanced Encryption Standard process. Also, the field of steganography evolved, in part, to develop methods like mimic functions that allow one piece of data to adopt the statistical profile of another. Nonetheless poor cipher usage or reliance on home-grown proprietary algorithms that have not been subject to thorough scrutiny has resulted in many computer-age encryption systems that are still subject to ciphertext-only attack. Examples include:
Early versions of Microsoft's PPTP virtual private network software used the same RC4 key for the sender and the receiver (later versions had other problems). In any case where a stream cipher like RC4 is used twice with the same key it is open to ciphertext-only attack. See: stream cipher attack Wired Equivalent Privacy (WEP), the first security protocol for Wi-Fi, proved vulnerable to several attacks, most of them ciphertext-only.
A chosen-plaintext attack (CPA) is an attack model for cryptanalysis which presumes that the
attacker has the capability to choose arbitrary plaintexts to be encrypted and obtain the
corresponding ciphertexts. The goal of the attack is to gain some further information which
reduces the security of the encryption scheme. In the worst case, a chosen-plaintext attack could
reveal the scheme's secret key.
This appears, at first glance, to be an unrealistic model; it would certainly be unlikely that an
attacker could persuade a human cryptographer to encrypt large amounts of plaintexts of the
attacker's choosing. Modern cryptography, on the other hand, is implemented in software or
hardware and is used for a diverse range of applications; for many cases, a chosen-plaintext
attack is often very feasible. Chosen-plaintext attacks become extremely important in the context
of public key cryptography, where the encryption key is public and attackers can encrypt any
plaintext they choose.
Any cipher that can prevent chosen-plaintext attacks is then also guaranteed to be secure against
known-plaintext and ciphertext-only attacks; this is a conservative approach to security.
Two forms of chosen-plaintext attack can be distinguished:
Batch chosen-plaintext attack, where the cryptanalyst chooses all plaintexts before any of them
are encrypted. This is often the meaning of an unqualified use of "chosen-plaintext attack".
Adaptive chosen-plaintext attack, where the cryptanalyst makes a series of interactive queries,
choosing subsequent plaintexts based on the information from the previous encryptions.
References:
Source: TIPTON, Harold, Official (ISC)2 Guide to the CISSP CBK (2007), page 271.
and
Wikipedia at the following links:
http://en.wikipedia.org/wiki/Chosen-plaintext_attack
http://en.wikipedia.org/wiki/Known-plaintext_attack
http://en.wikipedia.org/wiki/Ciphertext-only_attac
http://en.wikipedia.org/wiki/Brute_force_attack
NEW QUESTION: 3
HOTSPOT
A company uses Exchange Online. You plan to use the email domain contoso.com for all employees.
You must configure Exchange Online to support Outlook 2016 client connectivity.
You need to configure the appropriate DNS entries.
Which record should you create? To answer, select the appropriate entries from each list in the answer area.
Answer:
Explanation:
Explanation:
Box 1: Autodiscover.contoso.com
You can define an alias in one domain to point to a target server in a completely different domain.
Box 2: CNAME
The cloud-based service uses a CNAME record to implement the Autodiscover service for Outlook clients.
Box 3: Autodiscover.outlook.com
The Autodiscover CNAME record must contain the following information:
Alias autodiscover
Target autodiscover.outlook.com
References:https://msdn.microsoft.com/en-us/library/cc950655(v=exchsrvcs.149).aspx
NEW QUESTION: 4
Your network contains an Active Directory domain. The domain contains two Hyper-V hosts.
You plan to perform live migrations between the hosts.
You need to ensure that the live migration traffic is authenticated by using Kerberos.
What should you do first?
A. From Server Manager, install the Host Guardian Service server role on both servers.
B. From Server Manager, install the Host Guardian Service server role on a domain controller.
C. From Active Directory Users and Computers, modify the Delegation properties of the computer accounts for both servers.
D. From Active Directory Users and Computers, add the computer accounts for both servers to the Cryptographic Operators group.
Answer: C
Explanation:
Explanation/Reference:
Explanation:
If you have decided to use Kerberos to authenticate live migration traffic, configure constrained delegation before you proceed to the rest of the steps.
To configure constrained delegation
Open the Active Directory Users and Computers snap-in.
From the navigation pane, select the domain and double-click the Computers folder.
From the Computers folder, right-click the computer account of the source server and then click
Properties.
In the Properties dialog box, click the Delegation tab.
On the delegation tab, select Trust this computer for delegation to the specified services only. Under
that option, select Use Kerberos only.
References:
https://docs.microsoft.com/en-us/windows-server/virtualization/hyper-v/deploy/set-up-hosts-for-live- migration-without-failover-clustering