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NEW QUESTION: 1
A company hosts an application on multiple Amazon EC2 instances.
The application processes messages from an Amazon SQS queue writes to an Amazon RDS table and deletes the message from the queue Occasional duplicate records are found in the RDS table.
The SQS queue does not contain any duplicate messages.
What should a solutions archived do to ensure messages are being processed once only?
A. Use the ChangeMessageVisibility API call to increase the visibility timeout
B. Use the CreateQueue API call to create a new queue
C. Use the AddPermission API call to add appropriate permissions
D. Use the ReceiveMessage API call to set an appropriate wait time.
Answer: A
Explanation:
Keyword: SQS queue writes to an Amazon RDS
From this, Option D best suite & other Options ruled out [Option A - You can't intruduce one more Queue in the existing one; Option B - only Permission & Option C - Only Retrieves Messages] FIFO queues are designed to never introduce duplicate messages. However, your message producer might introduce duplicates in certain scenarios: for example, if the producer sends a message, does not receive a response, and then resends the same message. Amazon SQS APIs provide deduplication functionality that prevents your message producer from sending duplicates.
Any duplicates introduced by the message producer are removed within a 5-minute deduplication interval.
For standard queues, you might occasionally receive a duplicate copy of a message (at-least- once delivery). If you use a standard queue, you must design your applications to be idempotent (that is, they must not be affected adversely when processing the same message more than once).
CreateQueue - You can't change the queue type after you create it and you can't convert an existing standard queue into a FIFO queue. You must either create a new FIFO queue for your application or delete your existing standard queue and recreate it as a FIFO queue.
AddPermission - You create a queue, you have full control access rights for the queue. Only you, the owner of the queue, can grant or deny permissions to the queue.
ReceiveMessage - Retrieves one or more messages (up to 10), from the specified queue.
FIFO queues provide exactly-once processing, which means that each message is delivered once and remains available until a consumer processes it and deletes it.

Amazon SQS - Visibility Timeout

References:
https://aws.amazon.com/sqs/?nc2=h_ql_prod_ap_sqs
https://aws.amazon.com/sqs/faqs/
https://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/FIFO- queues.html#FIFO-queues-exactly-once-processing
https://youtu.be/XrX7rb6M3jw
https://docs.aws.amazon.com/AWSSimpleQueueService/latest/APIReference/API_ChangeMessa geVisibility.html

NEW QUESTION: 2
以下の各ステートメントについて、そのステートメントが正しい場合は「はい」を選択してください。そうでなければ、いいえを選択します。
注：それぞれ正しい選択は1ポイントの価値があります。

Answer:
Explanation:

NEW QUESTION: 3
Refer to the exhibit.

Which two statements are true about the displayed STP state? (Choose two.)
A. BPDUs with the TCN bit set are transmitted over port channel 1.
B. Port-channel 1 is flapping and the last flap occurred 1 minute and 17 seconds ago.
C. The switch does not have PortFast configured on Gi0/15.
D. The STP version configured on the switch is IEEE 802.1w.
Answer: A,C
Explanation:
A port enabled with portfast will not send topology changes when a port goes up or down, but here we see that 296 TCN's were sent so we know that Gi 0/15 does not have portfast enabled.
TCN's are sent using BPDU's over the root port, which we see is port channel 1.

NEW QUESTION: 4
An event rule already exists and Dynamic Workload Console (DWC) or composer is being used. What must be done if the event rule cannot be modified because it is locked by a user?
A. Start composer and issue the command unlock eventrule=<rule_narae>;forced
B. Edit Rule > select the Draft check box and then make changes > Save
C. Start composer and issue the command unlock event rule=<rule_name>;<user_name>; forced
D. Exit DWC or composer, restart DWC or composer, and re-edit the event rule
Answer: A

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