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NEW QUESTION: 1
사용자가 EC2에서 웹 서버를 실행하고 있습니다. EC2 인스턴스 사용률이 임계 값 한계를 초과하면 사용자가 SMS를 수신하려고 합니다. 이 경우 사용자는 어떤 AWS 서비스를 구성해야 합니까?
A. AWS CloudWatch + AWS SES
B. AWS CloudWatch + AWS SNS
C. AWS CloudWatch + AWS SQS
D. AWS EC2 + AWS CloudWatch
Answer: B
NEW QUESTION: 2
What does an IP address of 0.0.0.0 indicate?
A. Broadcast address of all nodes of local network segment
B. All networks
C. Network address
D. Broadcast address of specially designated network segment
Answer: B
NEW QUESTION: 3
Your network consists of a single Active Directory domain.
All domain controllers run Windows Server 2008 R2 and are configured as DNS servers.
A domain controller named DC1 has a standard primary zone for contoso.com.
A domain controller named DC2 has a standard secondary zone for contoso.com.
You need to ensure that the replication of the contoso.com zone is encrypted.
You must not lose any zone data.
What should you do?
A. Convert the primary zone into an Active Directory-integrated zone. Delete the secondary zone.
B. Convert the primary zone into an Active Directory-integrated stub zone. Delete the secondary zone.
C. Configure the zone transfer settings of the standard primary zone. Modify the Master Servers lists on the secondary zone.
D. On both servers, modify the interface that the DNS server listens on.
Answer: A
Explanation:
http://technet.microsoft.com/en-us/library/cc771150.aspx
Change the Zone Type You can use this procedure to change make a zone a primary, secondary, or stub zone. You can also use it to integrate a zone with Active Directory Domain Services (AD DS).
http://technet.microsoft.com/en-us/library/cc726034.aspx
Understanding Active Directory Domain Services Integration
The DNS Server service is integrated into the design and implementation of Active Directory Domain Services (AD DS). AD DS provides an enterprise-level tool for organizing, managing, and locating resources in a network.
Benefits of AD DS integration
For networks that deploy DNS to support AD DS, directory-integrated primary zones are strongly recommended. They provide the following benefits: DNS features multimaster data replication and enhanced security based on the capabilities of AD
-DS. In a standard zone storage model, DNS updates are conducted based on a single-master update model. In this model, a single authoritative DNS server for a zone is designated as the primary source for the zone. This server maintains the master copy of the zone in a local file. With this model, the primary server for the zone represents a single fixed point of failure. If this server is not available, update requests from DNS clients are not processed for the zone.
With directory-integrated storage, dynamic updates to DNS are sent to any AD DS-integrated DNS server and are replicated to all other AD DS-integrated DNS servers by means of AD DS replication. In this model, any AD DS-integrated DNS servercan accept dynamic updates for the zone. Because the master copy of the zone is maintained in the AD DS database, which is fully replicated to all domain controllers, the zone can be updated by the DNS servers operating at any domain controller for the domain. With the multimaster update model of AD DS, any of the primary servers for the directory-integrated zone can process requests from DNS clients to update the zone as long as a domain controller is available and reachable on the network. ..
-Zones are replicated and synchronized to new domain controllers automatically whenever a new one is added to an AD DS domain.
-By integrating storage of your DNS zone databases in AD DS, you can streamline database replication planning for your network.
-Directory-integrated replication is faster and more efficient than standard DNS replication.
http://technet.microsoft.com/en-us/library/ee649124%28v=ws.10%29.aspx
Deploy IPsec Policy to DNS Servers
You can deploy IPsec rules through one of the following mechanisms:
-Domain Controllers organizational unit (OU): If the DNS servers in your domain are Active Directory-integrated, you can deploy IPsec policy settings using the Domain Controllers OU. This option is recommended to make configuration and deployment easier.
-DNS Server OU or security group: If you have DNS servers that are not domain controllers, then consider creating a separate OU or a security group with the computer accounts of your DNS servers.
-Local firewall configuration: Use this option if you have DNS servers that are not domain members or if you have a small number of DNS servers that you want to configure locally.
http://technet.microsoft.com/en-us/library/cc772661%28v=ws.10%29.aspx
Deploying Secure DNS
Protecting DNS Servers
When the integrity of the responses of a DNS server are compromised or corrupted, or when the DNS data is tampered with, clients can be misdirected to unauthorized locations without their knowledge. After the clients start communicating with these unauthorized locations, attempts can be made to gain access to information that is stored on the client computers. Spoofing and cache pollution are examples of this type of attack.
Another type of attack, the denial-of-service attack, attempts to incapacitate a DNS server to make DNS infrastructure unavailable in an enterprise. To protect your DNS servers from these types of attacks:
-Use IPsec between DNS clients and servers.
-Monitor network activity.
-Close all unused firewall ports.
Implementing IPsec Between DNS Clients and Servers
IPsec encrypts all traffic over a network connection. Encryption minimizes the risk that data that is sent between the DNS clients and the DNS servers can be scanned for sensitive information or tampered with by anyone attempting to collect information by monitoring traffic on the network. When IPsec is enabled, both ends of a connection are validated before communication begins. A client can be certain that the DNS server with which it is communicating is a valid server. Also, all communication over the connection is encrypted, thereby eliminating the possibility of tampering with client communication. Encryption prevents spoofing attacks, which are false responses to DNS client queries by unauthorized sources that act like a DNS server.
Further information:
http://technet.microsoft.com/en-us/library/cc771898.aspx
Understanding Zone Types
The DNS Server service provides for three types of zones:
-Primary zone
-Secondary zone
-Stub zone
Note: If the DNS server is also an Active Directory Domain Services (AD DS) domain controller, primary zones and stub zones can be stored in AD DS.
The following sections describe each of these zone types:
Primary zone
When a zone that this DNS server hosts is a primary zone, the DNS server is the primary source for information about this zone, and it stores the master copy of zone data in a local file or in AD DS. When the zone is stored in a file, by default the primary zone file is named zone_name.dns and it is located in the % windir%\System32\Dns folder on the server.
Secondary zone
When a zone that this DNS server hosts is a secondary zone, this DNS server is a secondary source for information about this zone. The zone at this server must be obtained from another remote DNS server computer that also hosts the zone. This DNS server must have network access to the remote DNS server that supplies this server with updated information about the zone. Because a secondary zone is merely a copy of a primary zone that is hosted on another server, it cannot be stored in AD DS.
Stub zone
When a zone that this DNS server hosts is a stub zone, this DNS server is a source only for information about the authoritative name servers for this zone. The zone at this server must be obtained from another DNS server that hosts the zone. This DNS server must have network access to the remote DNS server to copy the authoritative name server information about the zone.
You can use stub zones to:
-Keep delegated zone information current. By updating a stub zone for one of its child zones regularly, the DNS server that hosts both the parent zone and the stub zone will maintain a current list of authoritative DNS servers for the child zone.
-Improve name resolution. Stub zones enable a DNS server to perform recursion using the stub zone's list of name servers, without having to query the Internet or an internal root server for the DNS namespace.
-Simplify DNS administration. By using stub zones throughout your DNS infrastructure, you can distribute a list of the authoritative DNS servers for a zone without using secondary zones. However, stub zones do not serve the same purpose as secondary zones, and they are not an alternative for enhancing redundancy and load sharing.
There are two lists of DNS servers involved in the loading and maintenance of a stub zone:
-The list of master servers from which the DNS server loads and updates a stub zone. A master server may be a primary or secondary DNS server for the zone. In both cases, it will have a complete list of the DNS servers for the zone.
-The list of the authoritative DNS servers for a zone. This list is contained in the stub zone using name server (NS) resource records.
When a DNS server loads a stub zone, such as widgets.tailspintoys.com, it queries the master servers, which can be in different locations, for the necessary resource records of the authoritative servers for the zone widgets.tailspintoys.com. The list of master servers may contain a single server or multiple servers, and it can be changed anytime.
http://social.technet.microsoft.com/Forums/en-US/winserverNIS/thread/d352966e-b1ec-46b6-a8b4317c2c3388c3/
Answered what is non-standard dns secondary zone?
Q: While passing through 70-291 exam prep questions, I encountered the term "standard secondary zone". From the context of other questions I understood that "standard", in context of primary zone, mean "non-AD-integrated".
A: Standard means it is not an AD integrated zone. AD integrated zones are stored in the AD database and not in a text file.
Q: What does "standard" mean in context of DNS secondary zone?
A:
It means the same thing in context of a Standard Primary Zone. Simply stated, "Standard" means the zone data is stored in a text file, which can be found in system32\dns.
NEW QUESTION: 4
한 회사에서 주간 분석 보고서를 위한 로컬 리포지토리로 Amazon S3를 사용하고 있습니다. 회사 전체 요구 사항 중 하나는 암호화를 사용하여 저장 데이터를 보호하는 것입니다. 회사는 Amazon 53 서버 측 암호화 (SSE)를 선택합니다. GET 요청이 발행 될 때 객체를 어떻게 해독 할 수 있습니까?
A. Amazon S3는 객체 암호 해독을 위한 서버 측 키를 제공합니다.
B. 사용자는 개체를 해독하기 위해 Put 요청이 필요합니다.
C. 사용자는 개인 키를 사용하여 개체를 해독해야 합니다.
D. Amazon S3는 암호화 및 암호 해독을 자동으로 관리합니다.
Answer: A
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