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NEW QUESTION: 1
According to the best practices, in a service provider network, which statement is true as related to the QoS policy that should be implemented on the inbound provider (P) to provider (P) router link?
A. In the DiffServ model, all ingress and egress QoS processing are done at the network edge (for example, PE router), so no input or output QoS policy will be needed on the P to P link.
B. Class-based marking should be implemented because it will be needed for the class-based queuing that will be used on the P router output.
C. Traffic policing should be implemented to rate-limit the ingress traffic into the P router.
D. Because traffic should have already been policed and marked on the upstream ingress PE router, no input QoS policy is needed on the P to P link.
Answer: D

NEW QUESTION: 2
UDPスキャンはどのように機能しますか？
A. SYNパケットを送信して、開いているポートを確認します。
B. UDPスキャンは、ICMP「ポート到達不能」メッセージに依存して、ポートが開いているかどうかを判断する必要があります。
スキャナがUDPパケットを送信し、被害者のシステムでポートが開いていない場合、そのシステムはICMP "port unreachable"メッセージで応答します。
C. 3ウェイハンドシェイクを確立します。
D. ICMP "port unreachable"メッセージを被害者に送信する。
Answer: B

NEW QUESTION: 3
John works as a Database Administrator for www.company.com Inc. The company has a SQL server 2008 database. John wants to define a valid data while adding or updating an entry in a table of a relational database. Which of the following should he use to accomplish the task?
A. Stored procedure
B. Check constraint
C. Locking hints
D. View
Answer: B
Explanation:
A check constraint is a condition that defines valid data when adding or updating an entry in a table of a relational database. A check constraint is applied to each row in the table. The constraint must be a predicate. It can refer to a single or multiple columns of the table. Theresult of the predicate can be either TRUE, FALSE, or UNKNOWN, depending on the presence of NULLs. If the predicate evaluates to UNKNOWN, then the constraint is not violated and the row can be inserted or updated in the table. This is contrary to the predicates in the WHERE clauses in the SELECT or UPDATE statements.
Answer C is incorrect. A stored procedure is a collection of T-SQL statement or a reference
to common language runtime (CLR) method that can return as well as take the user-
supplied parameters. Procedures can be created for permanent use or for temporary use
within a session as local temporary procedure, or global temporary procedure for
temporary use within all sessions.
Answer D is incorrect. A view is a type of virtual table. The data accessible through a view
is not stored in the database as a distinct object. Views are created by defining a SELECT
statement. The result set of the SELECT statement forms the virtual table. A user can use
this virtual table by referencing the view name in SQL statements in the same way a table
is referenced. A view does not contain data of its own but derives (or dynamically displays)
data from other tables or views on the basis of the query specified for the view. The tables
from which a view derives data are known as base tables. Operations on a view affect its
base tables.
The syntax for creating a view is as follows:
CREATE VIEW <VIEW name> AS
SELECT <attributes>
FROM <Tablename>
WHERE <condition>
Answer A is incorrect. Locking hints can be particular for individual table references in the
INSERT, SELECT, DELETE, and UPDATE statements. The hints state the type of locking
or row versioning the instance of the Microsoft SQL Server Database Engine used for the
tabledata. Table level locking hints are used when a finer control of the types of locks
acquired on an object is required. These locking hints take priority over the current
transaction isolation level for the session.