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NEW QUESTION: 1
In a PKI infrastructure where are list of revoked certificates stored?
A. CRL
B. Recovery Agent
C. Registration Authority
D. Key escrow
Answer: A
Explanation:
Certificate revocation is the process of revoking a certificate before it expires.
A certificate may need to be revoked because it was stolen, an employee moved to a new company, or someone has had their access revoked. A certificate revocation is handled either through a Certificate Revocation List (CRL) or by using the Online Certificate Status
Protocol (OCSP).
A repository is simply a database or database server where the certificates are stored. The process of revoking a certificate begins when the CA is notified that a particular certificate needs to be revoked. This must be done whenever the private key becomes known/compromised.
The owner of a certificate can request it be revoked at any time, or the request can be made by the administrator. The CA marks the certificate as revoked. This information is published in the CRL. The revocation process is usually very quick; time is based on the publication interval for the CRL.
Disseminating the revocation information to users may take longer. Once the certificate has been revoked, it can never be used-or trusted-again. The CA publishes the CRL on a regular basis, usually either hourly or daily. The CA sends or publishes this list to organizations that have chosen to receive it; the publishing process occurs automatically in the case of PKI. The time between when the CRL is issued and when it reaches users may be too long for some applications. This time gap is referred to as latency.
OCSP solves the latency problem: If the recipient or relaying party uses OCSP for verification, the answer is available immediately.
The following answers are incorrect:
Registration Authority (RA) A registration authority (RA) is an authority in a network that verifies user requests for a digital certificate and tells the certificate authority (CA) to issue it. RAs are part of a public key infrastructure (PKI), a networked system that enables companies and users to exchange information and money safely and securely. The digital certificate contains a public key that is used to encrypt and decrypt messages and digital signatures.
Recovery agent Sometimes it is necessary to recover a lost key. One of the problems that often arises regarding PKI is the fear that documents will become lost forever-irrecoverable because someone loses or forgets his private key. Let's say that employees use Smart Cards to hold their private keys. If a user was to leave his Smart
Card in his or her wallet that was left in the pants that he or she accidentally threw into the washing machine, then that user might be without his private key and therefore incapable of accessing any documents or e-mails that used his existing private key.
Many corporate environments implement a key recovery server solely for the purpose of backing up and recovering keys. Within an organization, there typically is at least one key recovery agent. A key recovery agent has the authority and capability to restore a user's lost private key. Some key recovery servers require that two key recovery agents retrieve private user keys together for added security. This is similar to certain bank accounts, which require two signatures on a check for added security. Some key recovery servers also have the ability to function as a key escrow server, thereby adding the ability to split the keys onto two separate recovery servers, further increasing security.
Key escrow (also known as a "fair" cryptosystem) is an arrangement in which the keys needed to decrypt encrypted data are held in escrow so that, under certain circumstances, an authorized third party may gain access to those keys. These third parties may include businesses, who may want access to employees' private communications, or governments, who may wish to be able to view the contents of encrypted communications.
The following reference(s) were/was used to create this question:
Dulaney, Emmett (2011-06-03). CompTIA Security+ Study Guide: Exam SY0-301 (pp. 347-
348). John Wiley and Sons. Kindle Edition.
and
http://en.wikipedia.org/wiki/Key_escrow
and
http://my.safaribooksonline.com/book/certification/securityplus/9781597494267/public-key- infrastructure/ch12lev1sec5 and
http://searchsecurity.techtarget.com/definition/registration-authority
NEW QUESTION: 2
Which two options are reasons for TCP starvation? (Choose two.)
A. Mixing TCP and UDP traffic in the same traffic class
B. The use of WRED
C. The use of TCP congestion control
D. The use of tail drop
Answer: A,C
Explanation:
It is a general best practice to not mix TCP-based traffic with UDP-based traffic (especially Streaming-Video) within a single service-provider class because of the behaviors of these protocols during periods of congestion. Specifically,
TCP transmitters throttle back flows when drops are detected. Although some UDP applications have application-level windowing, flow control, and retransmission capabilities, most UDP transmitters are completely oblivious to drops and, thus, never lower transmission rates because of dropping.
When TCP flows are combined with UDP flows within a single service-provider class and the class experiences congestion, TCP flows continually lower their transmission rates, potentially giving up their bandwidth to UDP flows that are oblivious to drops. This effect is called TCP starvation/UDP dominance.
TCP starvation/UDP dominance likely occurs if (TCP-based) Mission-Critical Data is assigned to the same service- provider class as (UDP-based) Streaming-Video and the class experiences sustained congestion. Even if WRED or other
TCP congestion control mechanisms are enabled on the service-provider class, the same behavior would be observed because WRED (for the most part) manages congestion only on TCP-based flows.
Reference: http://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/WAN_and_MAN/QoS_SRND/QoS-SRND-
Book/VPNQoS.html
NEW QUESTION: 3
会社には、Azureディレクトリ（Contoso.comという名前のAzure AD0テナントを使用するMicrosoft 365サブスクリプションがあります。テナントには、次の表に示すユーザーが含まれています。
次の構成を持つLabel1という名前の関係ラベルを作成します。
コンテンツを5年間保持します。
5年以上前のすべてのコンテンツを自動的に削除します。
Policy1という名前のポリシーを使用して、Label1 bの自動ラベル付けをオンにします。 Policy1には次の構成があります。
*コンテンツを5年間保持
* 5年以上前のすべてのコンテンツを自動的に削除します
Policy1という名前のポリシーを使用して、ラベル1の自動ラベル付けをオンにします。ポリシーには次の構成があります。
*合併という単語を含むコンテンツに適用
* OneDriveアカウントとSharePointサイトの場所を指定します
次のコマンドを実行します
RetentionConpliancePolicy Policy1 RestrictiveRelention $ true Forceを設定します
次の各文について、文が真の場合は「はい」を選択します。そうでない場合は、「いいえ」を選択します注：正しい選択はそれぞれ1ポイントの価値があります。
Answer:
Explanation:
NEW QUESTION: 4
What restriction apply when a new currency is introduced for productive company codes and ledgers? There are 2 correct answer to this question.
A. Reconciliation for entities in asset accounting is NOT included.
B. New currency fields are NOT updated for existing data.
C. Archived data CANNOT be enriched with the new currency.
D. Calculated values are NOT added to the ACDOCA.
Answer: A,C