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NEW QUESTION: 1
次の攻撃のうちどれがメッセージ認証コード（MAC）によってネットワークが保護されますか？
A. DDoS
B. なりすまし
C. SYNフラッド
D. サービス拒否
Answer: B
Explanation:
説明/参照：
Explanation:
Explanation:
メッセージ認証コード（MAC）は、あなたのネットワークをなりすまし攻撃から守ることができます。なりすましは、マスカレードとも呼ばれ、攻撃者がネットワークパケットを傍受し、パケットヘッダーの送信元アドレスを許可されたホストのアドレスに置き換え、受信者に送信される偽の情報を再挿入する一般的なトリックです。この種の攻撃では、パケットの内容が変更されます。 MACは、この種の攻撃を防ぎ、データが変更されていないことを確認することでデータの完全性を保証します。 MACは、周波数分析、シーケンス操作、および暗号文のみの攻撃からも保護します。 MACは、送信者と受信者が共有する秘密鍵を必要とする安全なメッセージダイジェストであり、受信者が変更を検出できるため、探知機器がデータとMACの両方を変更することは不可能です。
サービス拒否（DoS）攻撃により、ターゲットシステムに不要な要求があふれ、ユーザへのサービスが停止します。この攻撃の1つの形態は、ターゲットとのTCP接続を要求する大量のパケットを生成し、すべてのリソースを拘束し、ターゲットが他の要求を処理できないようにします。 MACはDoS攻撃を防ぎません。ステートフルパケットフィルタリングは、DoS攻撃に対する最も一般的な防御策です。
分散型サービス拒否攻撃（DDoS）は、複数のシステムを使用してネットワークに洪水が発生し、ターゲットシステムのリソースに負荷がかかる場合に発生します。ステートフルパケットフィルタリングを利用するさまざまな侵入検知システムが、DDoS攻撃から保護することができます。 SYNフラッド攻撃では、攻撃者は偽装したIPパケットでターゲットをフラッドさせ、フリーズまたはクラッシュさせます。 SYNフラッド攻撃は、着信接続を受け入れるデバイスのバッファを悪用するサービス拒否攻撃の一種であり、したがってMACで防御することはできません。 SYNフラッド攻撃に対する一般的な防御策には、フィルタリング、SYN-RECEIVEDタイマーの短縮、SYNキャッシュまたはSYN cookieの実装などがあります。
NEW QUESTION: 2
A. Option B
B. Option C
C. Option A
D. Option D
Answer: B
NEW QUESTION: 3
会社は、AWS Key Management Service（AWS KMS）を使用してAmazon RDSデータベースを保護しています。監査人は、会社がAWS KMSキーのすべての使用を記録することを推奨しています。
SIMPLESTソリューションとは何ですか？
A. スケジュールされたジョブを使用してAWS KMSを定期的にポーリングします。
B. AWS CloudTrailを使用してAWS KMSキーの使用を記録します。
C. RDSインスタンスに監視エージェントを展開します。
D. AWS KMSメトリックスをAmazon CloudWatchに関連付けます。
Answer: B
Explanation:
Explanation
Built-in auditing AWS KMS is integrated with AWS CloudTrail to record all API requests, including key management actions and usage of your keys.