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NEW QUESTION: 1
スコアの更新をバックエンドプロセッサにストリーミングし、結果をリーダーボードに投稿するモバイルゲームを開発しています。ソリューションアーキテクトは、大きなトラフィックの急増に対応し、モバイルゲームの更新を受信順に処理し、処理された更新を高可用性データベースに格納できるソリューションを設計する必要があります。また、ソリューションを維持するために必要な管理オーバーヘッドを最小限に抑えたいと考えています。
これらの要件を満たすためにソリューションアーキテクトは何をすべきですか?
A. Amazon Kinesis Data Streamsにスコア更新をプッシュします。 AWS Lambdaを使用してKinesis Data Streamsの更新を処理します。処理された更新をAmazon DynamoDBに保存します。
B. Amazon Simple Notification Service(Amazon SNS)トピックへのスコア更新のプッシュ。 AWS Lambda関数をSNSトピックにサブスクライブして、更新を処理します。処理された更新をAmazon EC2で実行されているSOLデータベースに保存します。
C. スコア更新をAmazon Simple Queue Service(Amazon SOS)キューにプッシュします。 Auto Scalingで一連のAmazon EC2インスタンスを使用して、SQSキュー内の更新を処理します。処理された更新をAmazon RDSマルチAZ DBインスタンスに保存します。
D. Amazon Kinesis Data Streamsにスコアの更新をプッシュします。 Auto Scaling用にセットアップされた一連のAmazon EC2インスタンスで更新を処理します。処理された更新をAmazon Redshiflに保存します。
Answer: C
NEW QUESTION: 2
In the context of network enumeration by an outside attacker and possible Distributed Denial of Service (DDoS) attacks, which of the following firewall rules is not appropriate to protect an organization's internal network?
A. Drop echo request inbound
B. Allow echo reply inbound
C. Allow echo request outbound
D. Allow echo reply outbound
Answer: D
Explanation:
Explanation/Reference:
Echo replies outbound should be dropped, not allowed. There is no reason for any internet users to send ICMP ECHO Request to your interal hosts from the internet. If they wish to find out if a service is available, they can use a browser to connect to your web server or simply send an email if they wish to test your mail service.
Echo replies outbound could be used as part of the SMURF amplification attack where someone will send ICMP echo requests to gateways broadcast addresses in order to amplify the request by X number of users sitting behind the gateway.
By allowing inbound echo requests and outbound echo replies, it makes it easier for attackers to learn about the internal network as well by performing a simply ping sweep. ICMP can also be used to find out which host has been up and running the longest which would indicates which patches are missing on the host if a critical patch required a reboot.
ICMP can also be use for DDoS attacks, so you should strictly limit what type of ICMP traffic would be allowed to flow through your firewall.
On top of all this, tools such as LOKI could be use as a client-server application to transfer files back and forward between the internat and some of your internal hosts. LOKI is a client/server program published in the online publication Phrack . This program is a working proof-of-concept to demonstrate that data can be transmitted somewhat secretly across a network by hiding it in traffic that normally does not contain payloads. The example code can tunnel the equivalent of a Unix RCMD/RSH session in either ICMP echo request (ping) packets or UDP traffic to the DNS port. This is used as a back door into a Unix system after root access has been compromised. Presence of LOKI on a system is evidence that the system has been compromised in the past.
The outbound echo request and inbound echo reply allow internal users to verify connectivity with external hosts.
The following answers are incorrect:
Allow echo request outbound The outbound echo request and inbound echo reply allow internal users to verify connectivity with external hosts.
Drop echo request inbound There is no need for anyone on the internet to attempt pinging your internal hosts.
Allow echo reply inbound The outbound echo request and inbound echo reply allow internal users to verify connectivity with external hosts.
Reference(s) used for this question:
http://www.phrack.org/issues.html?issue=49&id=6
STREBE, Matthew and PERKINS, Charles, Firewalls 24seven, Sybex 2000, Chapter 10: The Perfect Firewall.
NEW QUESTION: 3
During installation of an Avaya CallPilot RIs. 5.0 system, a technician prepares to conned the 600r server to the ELAN Subnet. One end of the CAT5 cable connects to the server ELAN NIC connector at the rear panel of the server. Where is the other end of the cable connected?
A. the customer's network Gateway Router
B. the ELAN gateway
C. the ELAN Ethernet switch (Layer 2) or hub
D. the clan switch (Layer 2) or hub
Answer: C