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NEW QUESTION: 1
The backups server connects to a NAS device using block-level storage over Ethernet. The performance is very slow, however, and the network technician suspects the performance issues are network related. Which of the following should the technician do to improve performance?
A. Utilize UDP to eliminate packet overhead
B. Turn off MDIX settings on the NAS and server switchports
C. Encapsulate the storage traffic in a GRE tunnel
D. Enable jumbo frames on the NAS and server
Answer: D
NEW QUESTION: 2
In an online transaction processing system (OLTP), which of the following actions should be taken when erroneous or invalid transactions are detected?
A. The transactions should be processed after the program makes adjustments.
B. The transactions should be corrected and reprocessed.
C. The transactions should be dropped from processing.
D. The transactions should be written to a report and reviewed.
Answer: D
Explanation:
In an online transaction processing system (OLTP) all transactions are recorded as they occur. When erroneous or invalid transactions are detected the transaction can be recovered by reviewing the logs.
As explained in the ISC2 OIG: OLTP is designed to record all of the business transactions of an organization as they occur. It is a data processing system facilitating and managing transaction-oriented applications. These are characterized as a system used by many concurrent users who are actively adding and modifying data to effectively change real-time data.
OLTP environments are frequently found in the finance, telecommunications, insurance, retail, transportation, and travel industries. For example, airline ticket agents enter data in the database in real-time by creating and modifying travel reservations, and these are increasingly joined by users directly making their own reservations and purchasing tickets through airline company Web sites as well as discount travel Web site portals. Therefore, millions of people may be accessing the same flight database every day, and dozens of people may be looking at a specific flight at the same time.
The security concerns for OLTP systems are concurrency and atomicity.
Concurrency controls ensure that two users cannot simultaneously change the same data, or that one user cannot make changes before another user is finished with it. In an airline ticket system, it is critical for an agent processing a reservation to complete the transaction, especially if it is the last seat available on the plane.
Atomicity ensures that all of the steps involved in the transaction complete successfully. If one step should fail, then the other steps should not be able to complete. Again, in an airline ticketing system, if the agent does not enter a name into the name data field correctly, the transaction should not be able to complete.
OLTP systems should act as a monitoring system and detect when individual processes
abort, automatically restart an aborted process, back out of a transaction if necessary,
allow distribution of multiple copies of application servers across machines, and perform
dynamic load balancing.
A security feature uses transaction logs to record information on a transaction before it is
processed, and then mark it as processed after it is done. If the system fails during the
transaction, the transaction can be recovered by reviewing the transaction logs.
Checkpoint restart is the process of using the transaction logs to restart the machine by
running through the log to the last checkpoint or good transaction. All transactions following
the last checkpoint are applied before allowing users to access the data again.
Wikipedia has nice coverage on what is OLTP:
Online transaction processing, or OLTP, refers to a class of systems that facilitate and
manage transaction-oriented applications, typically for data entry and retrieval transaction
processing. The term is somewhat ambiguous; some understand a "transaction" in the
context of computer or database transactions, while others (such as the Transaction
Processing Performance Council) define it in terms of business or commercial transactions.
OLTP has also been used to refer to processing in which the system responds immediately
to user requests. An automatic teller machine (ATM) for a bank is an example of a
commercial transaction processing application.
The technology is used in a number of industries, including banking, airlines, mailorder,
supermarkets, and manufacturing. Applications include electronic banking, order
processing, employee time clock systems, e-commerce, and eTrading.
There are two security concerns for OLTP system: Concurrency and Atomicity
ATOMICITY
In database systems, atomicity (or atomicness) is one of the ACID transaction properties.
In an atomic transaction, a series of database operations either all occur, or nothing occurs.
A guarantee of atomicity prevents updates to the database occurring only partially, which
can cause greater problems than rejecting the whole series outright.
The etymology of the phrase originates in the Classical Greek concept of a fundamental
and indivisible component; see atom.
An example of atomicity is ordering an airline ticket where two actions are required:
payment, and a seat reservation. The potential passenger must either:
both pay for and reserve a seat; OR
neither pay for nor reserve a seat.
The booking system does not consider it acceptable for a customer to pay for a ticket
without securing the seat, nor to reserve the seat without payment succeeding.
CONCURRENCY
Database concurrency controls ensure that transactions occur in an ordered fashion.
The main job of these controls is to protect transactions issued by different
users/applications from the effects of each other. They must preserve the four
characteristics of database transactions ACID test: Atomicity, Consistency, Isolation, and
Durability. Read http://en.wikipedia.org/wiki/ACID for more details on the ACID test.
Thus concurrency control is an essential element for correctness in any system where two
database transactions or more, executed with time overlap, can access the same data,
e.g., virtually in any general-purpose database system. A well established concurrency
control theory exists for database systems: serializability theory, which allows to effectively
design and analyze concurrency control methods and mechanisms.
Concurrency is not an issue in itself, it is the lack of proper concurrency controls that
makes it a serious issue.
The following answers are incorrect:
The transactions should be dropped from processing. Is incorrect because the transactions
are processed and when erroneous or invalid transactions are detected the transaction can
be recovered by reviewing the logs.
The transactions should be processed after the program makes adjustments. Is incorrect
because the transactions are processed and when erroneous or invalid transactions are
detected the transaction can be recovered by reviewing the logs.
The transactions should be corrected and reprocessed. Is incorrect because the
transactions are processed and when erroneous or invalid transactions are detected the
transaction can be recovered by reviewing the logs.
References:
Hernandez CISSP, Steven (2012-12-21). Official (ISC)2 Guide to the CISSP CBK, Third Edition ((ISC)2 Press) (Kindle Locations 12749-12768). Auerbach Publications. Kindle Edition. and http://en.wikipedia.org/wiki/Online_transaction_processing and http://databases.about.com/od/administration/g/concurrency.htm
NEW QUESTION: 3
Azure Kubernetes Service（AKS）を使用してコンテナーを実行するポッドをホストするマイクロサービスアーキテクチャを設計しています。各ポッドデプロイメントは個別のAPIをホストします各APIは個別のサービスとして実装されます-AzureAPIManagementから外部ユーザーがAPIを利用できるようにするソリューションを推奨する必要があります。
ソリューションは、次の要件を満たす必要があります。
* API ManagementとAKSベースのAPI間の相互US認証を使用して、APIへのアクセスを制御します。
*単一のIPアドレスを使用してAPIへのアクセスを提供します。
APIへのアクセスを提供するために何をお勧めしますか？
A. AKSのLoadBelancerサービス
B. AKSの入力コントローラー
C. カスタムネットワークセキュリティグループ（NSG）
Answer: B
Explanation:
Explanation
An ingress controller is a piece of software that provides reverse proxy, configurable traffic routing, and TLS termination for Kubernetes services. Kubernetes ingress resources are used to configure the ingress rules and routes for individual Kubernetes services. Using an ingress controller and ingress rules, a single IP address can be used to route traffic to multiple services in a Kubernetes cluster.
Reference:
https://docs.microsoft.com/en-us/azure/aks/ingress-basic