Questions and Answers: 166
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NEW QUESTION: 1
Twelve-Factor Microservices方法論の要素は次のうちどれですか？注：この質問には2つの正解があります
A. 依存関係
B. プロトタイピング
C. バッキングサービス
D. ドラフト処理
Answer: A,C
NEW QUESTION: 2
セキュリティ管理者は、新しいアプリケーションの基準を満たすために暗号化アルゴリズムを選択するよう求められました。アプリケーションは、コンピュータとモバイルデバイスの両方で見ることができるストリーミングビデオを利用します。アプリケーション設計者は、このアルゴリズムが可能な限り低いパフォーマンスオーバーヘッドでトランスポート暗号化をサポートすることを要求しています。
次の推奨事項のうちどれがアプリケーション設計者のニーズを最もよく満たすでしょうか。 （2を選択）
A. 電子コードブックモードでAESを使用
B. ナンス生成IVでRC4を使用
C. カウンターモードでAESを使用
D. 暗号ブロック連鎖モードでRC4を使用
E. AESと暗号化テキストのパディングを併用
F. 固定IV世代でRC4を使用
Answer: B,C
Explanation:
In cryptography, an initialization vector (IV) is a fixed-size input to a cryptographic primitive that is typically required to be random or pseudorandom. Randomization is crucial for encryption schemes to achieve semantic security, a property whereby repeated usage of the scheme under the same key does not allow an attacker to infer relationships between segments of the encrypted message.
Some cryptographic primitives require the IV only to be non-repeating, and the required randomness is derived internally. In this case, the IV is commonly called a nonce (number used once), and the primitives are described as stateful as opposed to randomized. This is because the IV need not be explicitly forwarded to a recipient but may be derived from a common state updated at both sender and receiver side. An example of stateful encryption schemes is the counter mode of operation, which uses a sequence number as a nonce.
AES is a block cipher. Counter mode turns a block cipher into a stream cipher. It generates the next keystream block by encrypting successive values of a "counter". The counter can be any function which produces a sequence which is guaranteed not to repeat for a long time, although an actual increment-by-one counter is the simplest and most popular.
Incorrect Answers:
A: AES in Electronic Codebook mode cannot be used to encrypt streaming video. You would need a stream cipher such as RC4 or AES in Counter Mode.
B: RC4 in Cipher Block Chaining mode cannot be used to encrypt streaming video. You would need a stream cipher such as RC4 (not in Cipher Block Chaining mode) or AES in Counter Mode.
C: You cannot use fixed IV generation for RC4 when encrypting streaming video.
D: AES with cipher text padding cannot be used to encrypt streaming video. You would need a stream cipher such as RC4 or AES in Counter Mode.
References:
https://en.wikipedia.org/wiki/Initialization_vector
NEW QUESTION: 3
以下关于电路交换和分组交换的描述正确的是 ______ 。（多选)
A. 分组交换网络资源利用率低
B. 电路交换延迟小,传输实时性强
C. 分组交换延迟大,传输实时性差
D. 电路交换网络资源利用率高
Answer: B,C
NEW QUESTION: 4
You try to mount an NFS file system, /datadir, on host fusion from the remote NFS server gravity using the NFSv4 protocol. The following message appears:
# mount -F nfs gravity:/datadir /datadir
nfs mount: gravity:/datadir: No such file or directory
What can cause the error?
A. The directory /datadir does NOT exist on the NFS client fusion.
B. The permissions on the directory /datadir on NFS server gravity are too restrictive.
C. The host fusion is NOT allowed to access /datadir on NFS server gravity.
D. The directory is spelled incorrectly in /etc/vfstab.
E. The NFS share /datadir does NOT exist on NFS server gravity.
Answer: E