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NEW QUESTION: 1
Refer to the exhibit.
If the given configuration is applied to the object-group vpnservers, during which time period are external users able to connect?
A. From Friday at 6:01 p.m. until Monday at 8:01 a.m.
B. From Friday at 6:00 p.m. until Monday at 8:00 a.m.
C. From Monday at 8:00 a.m. until Friday at 6:00 p.m.
D. From Monday at 8:01 a.m. until Friday at 5:59 p.m.
Answer: B
NEW QUESTION: 2
You have an Exchange Server 2010 organization. An Edge Transport server sends and receives all e-mail messages.
You notice that some servers on the Internet identify e-mail messages from your organization as spam.
You need to minimize the possibility that e-mail messages send from your organization are identified as spam.
What should you do?
A. Configure the Edge Transport servers to use a real-time block list (RBL).
B. Implement Microsoft Forehead Security for Exchange Server.
C. Create SenderID TXT records for the Edge Transport servers.
D. Install a server certificate from a trusted third-party certification authority (CA).
Answer: C
Explanation:
Understanding Sender ID
The Sender ID agent is an anti-spam agent that's enabled on computers that have the Microsoft Exchange Server 2010 Edge Transport server role installed. The Sender ID agent relies on the RECEIVED SMTP header and a query to the sending system's DNS service to determine what action, if any, to take on an inbound message.
When you configure anti-spam agents on an Edge Transport server, the agents act on messages cumulatively to reduce the number of unsolicited e-mail messages that enter the organization. For more information about how to plan and deploy the anti-spam agents, see Understanding Anti-Spam and Antivirus Functionality.
Sender ID is intended to combat the impersonation of a sender and a domain, a practice that's frequently called spoofing. A spoofed mail is an e-mail message that has a sending address that was modified to appear as if it originates from a sender other than the actual sender of the message.
Spoofed mails typically contain a From: address that purports to be from a certain organization. In the past, it was relatively easy to spoof the From: address, in both the SMTP session, such as the MAIL FROM: header, and in the RFC 822 message data, such as From: "Masato Kawai" [email protected], because the headers weren't validated.
Using Sender ID to Combat Spoofing
In Exchange 2010, Sender ID makes spoofing more difficult. When you enable Sender ID, each message contains a Sender ID status in the metadata of the message. When an e-mail message is received, the Edge Transport server queries the sender's DNS server to verify that the IP address from which the message was received is authorized to send messages for the domain that's specified in the message headers. The IP address of the authorized sending server is referred to as the purported responsible address (PRA).
Domain administrators publish sender policy framework (SPF) records on their DNS servers. SPF records identify authorized outbound e-mail servers. If an SPF record is configured on the sender's DNS server, the Edge Transport server parses the SPF record and determines whether the IP address from which the message was received is authorized to send e-mail on behalf of the domain that's specified in the message. For more information about what an SPF record contains and how to create an SPF record, see Sender ID.
The Edge Transport server updates the message metadata with the Sender ID status based on the SPF record. After the Edge Transport server updates the message metadata, the Edge Transport server delivers the message as it ordinarily would.
http://technet.microsoft.com/en-us/library/aa996295.aspx
NEW QUESTION: 3
Amazon EC2で実行されるアプリケーションは、いつでも実行または終了できる柔軟なワークロードに対応する必要があります。最も低いコストでこれらの要件に対応する価格設定モデルはどれですか？
A. オンデマンドインスタンス
B. スポットインスタンス
C. 専用ホスト
D. リザーブドインスタンス
Answer: B