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NEW QUESTION: 1
Which tool provides the fastest query performance for enterprise reporting and business intelligence workloads, particularly those involving extremely complex SQL with multiple joins and sub-queries.
Choose the correct answer:
A. Redshift
B. SQS
C. EMR
D. Athena
Answer: A
Explanation:
Query services like Amazon Athena, data warehouses like Amazon Redshift, and sophisticated data processing frameworks like Amazon EMR, all address different needs and use cases. You just need to choose the right tool for the job. Amazon Redshift provides the fastest query performance for enterprise reporting and business intelligence workloads, particularly those involving extremely complex SQL with multiple joins and sub-queries. Amazon EMR makes it simple and cost-effective to run highly distributed processing frameworks such as Hadoop, Spark, and Presto when compared to on-premises deployments. Amazon EMR is flexible - you can run custom applications and code and define specific compute, memory, storage, and application parameters to optimize your analytic requirements. Amazon Athena provides the easiest way to run ad-hoc queries for data in S3 without the need to setup or manage any servers Reference:
https://aws.amazon.com/athena/faqs/

NEW QUESTION: 2
展示を表示し、PROMOTIONSテーブルのデータを確認します。

PROMO_BEGIN_DATEは、デフォルトの日付形式dd-mon-rrで保存されます。
2000年1月1日より前に開始されたPOSTカテゴリーのすべてのプロモーションの名前、コスト、および開始日を提供するレポートを作成する必要があります。
どのSQLステートメントを使用しますか？
A. SELECT promo_name, promo_cost, promo_begin_dateFROM promotionsWHERE promo_cost LIKE 'post%' AND promo_begin_date < '01-01-2000';
B. SELECT promo_name, promo_cost, promo_begin_dateFROM promotionsWHERE promo_category = 'post' AND promo_begin_date < '01-01-00';
C. SELECT promo_name, promo_cost, promo_begin_dateFROM promotionsWHERE promo_category LIKE '%post%' AND promo_begin_date < '1-JAN-00';
D. SELECT promo_name, promo_cost, promo_begin_dateFROM promotionsWHERE promo_category LIKE 'P%' AND promo_begin_date < '1-JANUARY-00';
Answer: C

NEW QUESTION: 3
Under which circumstance should a network administrator implement one-way NAT?
A. when the network must route UDP traffic
B. when the network has few public IP addresses and many private IP addresses require outside access
C. when traffic that originates inside the network must be routed to internal hosts
D. when traffic that originates outside the network must be routed to internal hosts
Answer: B
Explanation:
Explanation/Reference:
Explanation:
NAT operation is typically transparent to both the internal and external hosts. Typically the internal host is aware of the true IP address and TCP or UDP port of the external host. Typically the NAT device may function as the default gateway for the internal host. However the external host is only aware of the public IP address for the NAT device and the particular port being used to communicate on behalf of a specific internal host.
NAT and TCP/UDP
"Pure NAT", operating on IP alone, may or may not correctly parse protocols that are totally concerned with IP information, such as ICMP, depending on whether the payload is interpreted by a host on the
"inside" or "outside" of translation. As soon as the protocol stack is traversed, even with such basic protocols as TCP and UDP, the protocols will break unless NAT takes action beyond the network layer. IP packets have a checksum in each packet header, which provides error detection only for the header. IP datagrams may become fragmented and it is necessary for a NAT to reassemble these fragments to allow correct recalculation of higher-level checksums and correct tracking of which packets belong to which connection. The major transport layer protocols, TCP and UDP, have a checksum that covers all the data they carry, as well as the TCP/UDP header, plus a "pseudo-header" that contains the source and destination IP addresses of the packet carrying the TCP/UDP header. For an originating NAT to pass TCP or UDP successfully, it must recompute the TCP/UDP header checksum based on the translated IP addresses, not the original ones, and put that checksum into the TCP/UDP header of the first packet of the fragmented set of packets. The receiving NAT must recompute the IP checksum on every packet it passes to the destination host, and also recognize and recompute the TCP/UDP header using the retranslated addresses and pseudo-header. This is not a completely solved problem. One solution is for the receiving NAT to reassemble the entire segment and then recompute a checksum calculated across all packets.
The originating host may perform Maximum transmission unit (MTU) path discovery to determine the packet size that can be transmitted without fragmentation, and then set the don't fragment (DF) bit in the appropriate packet header field. Of course, this is only a one- way solution, because the responding host can send packets of any size, which may be fragmented before reaching the NAT.

NEW QUESTION: 4
A technician replaces a failed hard drive with a brand new one. The technician boots from a PE CD and attempts to install a custom OS build deployed from the network. The hard drive is visible in the system's BIOS. However, once in the preinstallation environment, the drive is not recognized in the imaging process and the process fails. Which of the following is MOST likely the cause of failure?
A. The hard drive needs to have its configuration manually defined in the BIOS.
B. The PC's power supply is not providing enough power to the new hard drive.
C. The boot CD has failed and needs to be replaced.
D. The hard drive has not been partitioned correctly.
Answer: D