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NEW QUESTION: 1
AWSインフラストラクチャ全体が1つのAmazon VPC内にあります。
地域のアベイラビリティーゾーン（AZ）AのAmazonインスタンスで実行されているインフラストラクチャー監視アプリケーションと、AZ Bで実行されている別のアプリケーションインスタンスがあります。
監視アプリケーションは、ICMP pingを使用して、アプリケーションをホストしているインスタンスのネットワーク到達可能性を確認する必要があります。
これらのインスタンスにセキュリティグループを設定して、ICMP pingが監視インスタンスからアプリケーションインスタンスにのみ通過できるようにし、それ以外は許可しないようにすることができます。
A. いいえ2つの異なるAZ内の2つのインスタンスは、そのプロトコルがサブネット（つまりブロードキャスト）境界を越えて許可されていないため、ICMP pingを介して互いに直接通信することはできません。
B. はい、監視インスタンスのセキュリティグループは送信ICMPを許可する必要があり、アプリケーションインスタンスのセキュリティグループは受信ICMPを許可する必要があります
C. はい、ICMPはコネクション型プロトコルではないため、監視インスタンスのセキュリティグループとアプリケーションインスタンスのセキュリティグループの両方で、受信と送信の両方のICMP pingパケットを許可する必要があります。
D. はい監視インスタンスとアプリケーションインスタンスの両方が同じセキュリティグループの一部である必要があり、そのセキュリティグループはインバウンドICMPを許可する必要があります
Answer: B
Explanation:
ICMPはコネクション型プロトコルではありませんが、セキュリティグループはステートフルです。
「セキュリティグループはステートフルです。許可された着信トラフィックへの応答は、発信ルールに関係なく発信フローを許可されます。その逆も同様です。」
http://docs.aws.amazon.com/AmazonVPC/latest/UserGuide/VPC_SecurityGroups.html

NEW QUESTION: 2
A security administrator is investigating a report that a user is receiving suspicious emails. The user's machine has an old functioning modem installed. Which of the following security concerns need to be identified and mitigated? (Choose two.)
A. Whaling
B. War dialing
C. Spear phishing
D. Vishing
E. Pharming
F. Hoaxing
Answer: B,F

NEW QUESTION: 3
Which is the preferred approach to communicate important action items in an e-mail message to a co- worker?
A. Include emoticons to ensure the recipient understands your humor.
B. Describe all action items at length in a detailed paragraph in the middle of the message.
C. List the action items in a numbered or bulleted list for clarity.
D. Write the action items using all capital letters.
Answer: C