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NEW QUESTION: 1
Which two tables are regularly polled by HTML servers to check for any change in the deployed package?
A. F9651
B. F9860
C. F986
D. F96511
E. F98611
Answer: B,C
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Which of the following index is known as value weighting?
A. Equal weighting
B. Price weighting
C. Capitalization weighting
D. Base weighting
Answer: C
NEW QUESTION: 3
顧客は悪意のあるソフトウェアへのリンクを含むEメールを受信しています。これらの電子メールはスパムフィルタを破壊しています。電子メールは次のようになります。
配信先：[email protected]
受信日：10.14.120.205まで
月、2010年11月1日11:15:24 -0700（PDT）
受信日：10.231.31.193まで
月、2010年11月1日11:15:23 -0700（PDT）
リターンパス：<[email protected]>
受信：<[email protected]>の127.0.0.1から。月、2010年11月1日13:15:14 -0500（封筒から<[email protected]>）受信：smtpex.example.com（SMTP READY）によるESMTP（AIO）;月、2010年11月1日13時15分14秒-0500受信：172.18.45.122から192.168.2.55まで。月、2010年11月1日13:15:14 -0500から：会社<[email protected]>に： "[email protected]" <[email protected]>日付：月、2010年11月1日13:15:11 -0500主題：新しい保険申請スレッドトピック：新しい保険申請あなたのアカウントへのフルアクセスを維持するために以下のサイトからソフトウェアをダウンロードしてインストールしてください。
www.examplesite.com
________________________________
追加情報：許可メールサーバーのIPアドレスは192.168.2.10と192.168.2.11です。
ネットワークのサブネットは192.168.2.0 / 25です。
次のうちどれがセキュリティ管理者がこのリスクを排除するために取ることができるであろう最も適切な行動方針ですか？ （2を選択）
A. オープンリレー機能を無効にします。
B. 不正メールサーバーのSMTPサービスをシャットダウンします。
C. 許可されていないメールサーバー上の悪意のある活動の起点を特定します。
D. スパムフィルタでSTARTTLSを有効にします。
E. すべての不正なメールサーバーに対してファイアウォールのポート25をブロックします。
Answer: B,E
Explanation:
In this question, we have an unauthorized mail server using the IP: 192.168.2.55.
Blocking port 25 on the firewall for all unauthorized mail servers is a common and recommended security step. Port 25 should be open on the firewall to the IP addresses of the authorized email servers only (192.168.2.10 and 192.168.2.11). This will prevent unauthorized email servers sending email or receiving and relaying email.
Email servers use SMTP (Simple Mail Transfer Protocol) to send email to other email servers. Shutting down the SMTP service on the unauthorized mail server is effectively disabling the mail server functionality of the unauthorized server.
Incorrect Answers:
A: You shouldn't worry about identifying the origination point for the malicious activity on the unauthorized mail server. There isn't much you could do about the remote origination point even if you did identify it. You have an 'unauthorized' mail server. That is what you should be dealing with.
C: In this question, the email was received by the unauthorized email server (192.168.2.55) ready to be collected by the recipient. The email was not relayed (forwarded) to other email servers. Disabling open relay functionality will not stop the emails. You need to disable all email (SMTP) functionality of the unauthorized server, not just relaying.
E: STARTTLS enables TLS encryption on communications with the spam filter. It will do nothing to prevent the usage of the unauthorized email server.
References:
https://en.wikipedia.org/wiki/Simple_Mail_Transfer_Protocol
https://www.arclab.com/en/kb/email/how-to-read-and-analyze-the-email-header-fields-spf-dkim.html