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Which of the following statements about URL rewriting are true?
Each correct answer represents a complete solution. Choose all that apply.
By default, session tracking uses cookies to associate a session identifier with a unique user. URL rewriting is used in cases where cookies are
not supported by the browser.
Which of the following statements about the /etc/profile file are true?
Each correct answer represents a complete solution. Choose all that apply.
The /etc/profile file is used to configure and control system-wide default variables. It performs many operations, some of which are as follows:
Exporting variables
Setting the umask value
Sending mail messages to indicate that new mail has arrived
Exporting variables
Setting the umask value
Sending mail messages to indicate that new mail has arrived
Only the root user can configure and change the /etc/profile file for all users on the system.
Answer A is incorrect. The /etc/skel file allows a system administrator to create a default home
directory for all new users on a
computer or network and thus to make certain that all users begin with the same settings. When a new account is created with a home
directory, the entire contents of /etc/skel are copied into the new home directory location. The home directory and its entire contents are then
set to the new account's UID and GID, making the new user owner of the initial files.
The system administrator can create files in /etc/skel that will provide a nice default environment for users. For example, he might create
a /etc/skel/.profile that sets the PATH environment variable for new users.
Answer B is incorrect. Only the root user can change the settings of the /etc/profile file.
You work as a Database Administrator for Net Perfect Inc. The company has a multi-platform network. The company requires fast processing of the data in the database of the company so that answers to queries can be generated quickly. To provide fast processing, you have a conceptual idea of representing the dimensions of data available to a user in the data cube format. Which of the following systems can you use to implement your idea?
A multidimensional database management system (MDDBMS) implies the ability to rapidly process the data in the database so that answers to
the queries can be generated quickly. A number of vendors provide products that use multidimensional databases. The approach behind this
system is to manage that how data should be stored in the database, and depending upon that storage, how user interface should vary.
Conceptually, an MDDBMS uses the idea of a data cube to represent the dimensions of data available to a user. For example, 'sales' could be
viewed in the dimensions of product model, geography, time, or some additional dimension. In this case, 'sales' is known as the measure
attribute of the data cube and the other dimensions are seen as feature attributes. Additionally, a database creator can define hierarchies
and levels within a dimension (for example, state and city levels within a regional hierarchy).
Answer C is incorrect. A federated database system is a type of meta-database management system (DBMS) that transparently
integrates multiple autonomous database systems into a single federated database. The constituent databases are interconnected via a
computer network, and may be geographically decentralized.
Since the constituent database systems remain autonomous, a federated database system is a contrastable alternative to the (sometimes
daunting) task of merging together several disparate databases. A federated database (or virtual database) is the fully-integrated, logical
composite of all constituent databases in a federated database system.
Answer A is incorrect. SYSDBA is a system privilege that allows a user to perform basic database administrative tasks, such as creating
a database, altering a database, starting up and shutting down an Oracle instance, performing time-based recovery etc. The SYSDBA contains
all system privileges with the ADMIN OPTION. It also contains the SYSOPER system privilege.
Granting the SYSDBA system privilege to a user automatically adds him to the password file that is used to authenticate administrative users.
Therefore, a user possessing the SYSDBA system privilege can connect to a database by using the password file authentication method.
Answer D is incorrect. A hierarchical database is a database management system that implements the hierarchical data model. A
hierarchical database system organizes data in a family tree structure such that each record has only one owner and the hierarchy is in a
parent and child data segment. This implies that the record can have repeated information in a child segment. The best-known hierarchical
DBMS is IMS.
Which of the following Web authentication techniques uses a single sign-on scheme?
Microsoft Passport authentication is based on single sign-on authentication in which a user needs to remember only one username and
password to be authenticated for multiple services. The Passport is a suite of services for authenticating users across a number of
applications. The Passport single sign-on service is an authentication service allowing users to create a single set of credentials that will
enable them to sign in to any participating site that supports the Passport service. It enables the use of one set of credentials to access any
Passport-enabled site such as MSN, Hotmail, and MSN Messenger.
Which of the following user authentications are supported by the SSH-1 protocol but not by the SSH-2 protocol?
Each correct answer represents a complete solution. Choose all that apply.
The Rhosts (rsh-style), TIS, and Kerberos user authentication methods are supported by the SSH-1 protocol but not by SSH-2 protocol.
Answer D is incorrect. Password-based authentication is supported by both the SSH-1 and SSH-2
protocols.
