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NEW QUESTION: 1
사용량이 많지 않은 시간에 개발자는 일반 작업 부하에 영향을 주지 않으면 서 전체 Amazon DynamoDB 테이블 검색의 실행 시간을 최소화하려고 합니다. 작업량은 비 피크 시간 동안 강하게 일관성 있는 읽기 용량 단위의 평균을 나타냅니다.
개발자가이 스캔을 어떻게 최적화합니까?
A. 스캔 작업 중 읽기 용량 단위 늘리기
B. 순차적 스캔 사용
C. 스캔 작업 중에 일관성을 유지하도록 일관성을 변경합니다.
D. 비율을 제한하면서 병렬 스캔 사용
Answer: D
Explanation:
Explanation
Parallel scans would help improve the scan performance while using limit parameter the provisioned throughput consumed can be limited.
Refer AWS documentation - DynamoDB Parallel Scan
By default, the Scan operation processes data sequentially. DynamoDB returns data to the application in 1 MB increments, and an application performs additional Scan operations to retrieve the next 1 MB of data.
The larger the table or index being scanned, the more time the Scan will take to complete. In addition, a sequential Scan might not always be able to fully utilize the provisioned read throughput capacity: Even though DynamoDB distributes a large table's data across multiple physical partitions, a Scan operation can only read one partition at a time. For this reason, the throughput of a Scanis constrained by the maximum throughput of a single partition.
To address these issues, the Scan operation can logically divide a table or secondary index into multiple segments, with multiple application workers scanning the segments in parallel. Each worker can be a thread (in programming languages that support multithreading) or an operating system process.
A parallel scan with a large number of workers can easily consume all of the provisioned throughput for the table or index being scanned. It is best to avoid such scans if the table or index is also incurring heavy read or write activity from other applications.
To control the amount of data returned per request, use the parameter. This can help prevent situations where one worker consumes all of the provisioned throughput, at the expense of all other workers.
NEW QUESTION: 2
What are four features of WPA? (Choose four.)
A. authenticated key management using 802.1X
B. requires AES-CCMP
C. unicast and broadcast key management
D. a larger initialization vector, increased to 48 bits
E. support for a key caching mechanism
F. a message integrity check protocol to prevent forgeries
Answer: A,C,D,F
Explanation:
Explanation/Reference:
Explanation:
TKIP and the related WPA standard implement three new security features to address security problems encountered in WEP protected networks. First, TKIP implements a key mixing function that combines the secret root key with the initialization vector before passing it to the RC4 initialization. WEP, in comparison, merely concatenated the initialization vector to the root key, and passed this value to the RC4 routine. This permitted the vast majority of the RC4 based WEP related key attacks. Second, WPA implements a sequence counter to protect against replay attacks. Packets received out of order will be rejected by the access point. Finally, TKIP implements a 64-bit Message Integrity Check (MIC).
To be able to run on legacy WEP hardware with minor upgrades, TKIP uses RC4 as its cipher. TKIP also provides a rekeying mechanism. TKIP ensures that every data packet is sent with a unique encryption key.
Key mixing increases the complexity of decoding the keys by giving an attacker substantially less data that has been encrypted using any one key. WPA2 also implements a new message integrity code, MIC. The message integrity check prevents forged packets from being accepted. Under WEP it was possible to alter a packet whose content was known even if it had not been decrypted.
http://en.wikipedia.org/wiki/Temporal_Key_Integrity_Protocol
http://documentation.netgear.com/reference/fra/wireless/WirelessNetworkingBasics-3-14.html
NEW QUESTION: 3
If the network address of a network is 10.1.1.0/30, then its broadcast address is ()?
A. 10.1.1.4
B. 10.1.1.2
C. 10.1.1.3
D. 10.1.1.1
Answer: C
NEW QUESTION: 4
新しい緊急プロジェクトのプロジェクト憲章が最近署名されました。スポンサーは、プロジェクトマネージャーがすぐにプロジェクトスケジュールの作成を開始することを要求しています。この場合、プロジェクトマネージャーは何をすべきですか？
A. スコープベースラインを確認し、WBSを作成します。
B. スケジュールを作成する前に、プロジェクトの重要な活動を特定します。
C. 同様のプロジェクトから学んだ教訓に基づいてスケジュールを作成します。
D. 利害関係者とのミーティングを計画して、プロジェクトのリスクと影響について話し合います。
Answer: A