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NEW QUESTION: 1
A company hosts its public website on Amazon EC2 instances behind an Application Load Balancer (ALB).
The instances are in an EC2 Auto Scaling group across multiple Availability Zones. The website is under a DDoS attack by a specific loT device brand that is visible in the user agent A security engineer needs to mitigate the attack without impacting the availability of the public website.
What should the security engineer do to accomplish this?
A. Configure a web ACL rule for AWS WAF to block requests with a string match condition for the user agent of the loT device. Associate the v/eb ACL with the ALB.
B. Configure an Amazon CloudFront distribution to use the ALB as an origin. Configure a web ACL rule for AWS WAF to block requests with a string match condition for the user agent of the loT device.
Associate the web ACL with the ALB Change the public DNS entry of the website to point to the CloudFront distribution.
C. Activate AWS Shield Advanced to enable DDoS protection. Apply an AWS WAF ACL to the ALB.
and configure a listener rule on the ALB to block loT devices based on the user agent.
D. Configure an Amazon CloudFront distribution to use a new ALB as an origin. Configure a web ACL rule for AWS WAF to block requests with a string match condition for the user agent of the loT device.
Change the ALB security group to alow access from CloudFront IP address ranges only Change the public DNS entry of the website to point to the CloudFront distribution.
Answer: C
NEW QUESTION: 2
DevOpsエンジニアは、AWSに画像バッチ処理クラスターを実装するための最も安価な方法を研究しています。アプリケーションはDockerコンテナーでは実行できず、Amazon EC2で実行する必要があります。バッチジョブはチェックポイントデータをNFSに格納し、中断を許容できます。一般的なEC2 Linuxイメージからクラスターソフトウェアを構成するには、30分かかります。
最も費用対効果の高いソリューションは何ですか？
A. チェックポイントデータにAmazon EFSを使用します。 EC2フリートを使用してEC2スポットインスタンスを起動します。クラスターのカスタムAMIを作成し、インスタンスの作成時に最新のAMIを使用します。
B. チェックポイントデータのEC2インスタンスでGlusterFSを使用します。バッチジョブを実行します。 EC2インスタンスを手動で構成します。ジョブが完了したら、インスタンスを手動でシャットダウンします。
C. チェックポイントデータにAmazon EFSを使用します。ジョブを完了するため。 EC2 Auto Scalingグループとオンデマンド料金モデルを使用して、EC2インスタンスを一時的にプロビジョニングします。
D. チェックポイントデータにAmazon EFSを使用します。 EC2フリートを使用してEC2スポットインスタンスを起動し、ユーザーデータを利用して起動時にEC2 Linuxインスタンスを構成します。
Answer: C
NEW QUESTION: 3
Sie bewerten die Leistung einer Datenbankumgebung.
Sie müssen unnötige Sperren vermeiden und sicherstellen, dass keine verlorenen Updates auftreten.
Sie müssen die Transaktionsisolationsstufe für jedes Datenszenario auswählen.
Welche Isolationsstufe sollten Sie für jedes Szenario verwenden? Ziehen Sie zur Beantwortung die entsprechenden Isolationsstufen auf die richtigen Szenarien. Jede Isolierung kann einmal, mehrmals oder überhaupt nicht verwendet werden. Möglicherweise müssen Sie die geteilte Leiste zwischen den Fenstern ziehen oder einen Bildlauf durchführen, um den Inhalt anzuzeigen.
Answer:
Explanation:
Erläuterung
Kasten 1: Readcommitted
Read Committed: Eine Transaktion T1, die unter dieser Isolationsstufe ausgeführt wird, kann nur auf festgeschriebene Daten zugreifen.
Vorteile: Guter Kompromiss zwischen Nebenläufigkeit und Konsistenz.
Nachteile: Sperren und Blockieren. Die Daten können sich ändern, wenn innerhalb derselben Transaktion mehrmals auf sie zugegriffen wird.
Box 2: Read Uncommitted
Read Uncommitted (auch als Dirty Read bezeichnet): Eine Transaktion T1, die unter dieser Isolationsstufe ausgeführt wird, kann auf Daten zugreifen, die durch gleichzeitige Transaktionen geändert wurden.
Vorteile: Keine Lesesperren zum Lesen von Daten erforderlich (d. H. Kein Blockieren von Lese- / Schreibvorgängen). Beachten Sie, dass T1 weiterhin Transaktionsdauersperren für alle geänderten Daten akzeptiert.
Nachteile: Es wird nicht garantiert, dass die Daten transaktionskonsistent sind.
Box 3: Serialisierbar
Serialisierbar: Eine Transaktion T1, die unter dieser Isolationsstufe ausgeführt wird, bietet die höchste Datenkonsistenz, einschließlich der Eliminierung von Phantomen, jedoch auf Kosten einer geringeren Parallelität. Es verhindert Phantome, indem es eine Bereichssperre oder eine Sperre auf Tabellenebene vornimmt, wenn die Bereichssperre für die Dauer der Transaktion nicht erfasst werden kann (d. H. Kein Index für die Prädikatspalte).
Vorteile: Volle Datenkonsistenz einschließlich Phantomschutz.
Nachteile: Sperren und Blockieren. Die S-Sperren werden für die Dauer der Transaktion gehalten, die die Parallelität verringern kann.
Verweise:
https://blogs.msdn.microsoft.com/sqlcat/2011/02/20/concurrency-series-basics-of-transaction-isolation-levels/
NEW QUESTION: 4
Refer to the exhibit.
Which option explains why the forwarding address is set to 0.0.0.0 instead of 110.100.1.1?
A. The next-hop interface (Ethernet0/1) is specified as part of the static route command; therefore, the forwarding address is always set to 0.0.0.0.
B. OSPF is not enabled on the interface Ethernet0/1.
C. The interface Ethernet0/1 is in down state.
D. The next-hop ip address 110.100.1.1 is not directly attached to the redistributing router.
Answer: B
Explanation:
From the output of the "show ip ospf database" command (although this command is not shown) we can conclude this is an ASBR (with Advertising Router is itself) and E0/1 is the ASBR's next hop interface for other routers to reach network 192.168.10.0.
The Forwarding Address is determined by these conditions:
*The forwarding address is set to 0.0.0.0 if the ASBR redistributes routes and OSPF is not enabled on the next hop interface for those routes.
*These conditions set the forwarding address field to a non-zero address:
+
OSPF is enabled on the ASBR's next hop interface AND
+
ASBR's next hop interface is non-passive under OSPF AND
+
ASBR's next hop interface is not point-to-point AND
+
ASBR's next hop interface is not point-to-multipoint AND
+
ASBR's next hop interface address falls under the network range specified in the router ospf
command.
* Any other conditions besides these set the forwarding address to 0.0.0.0.
-> We can see E0/1 interface is not running OSPF because it does not belong to network
110.110.0.0 0.0.255.255 which is declared under OSPF process -> F.A address is set to 0.0.0.0.
Reference. http://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/1368210.html
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