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The two major problems with passwords are when they are easy to guess based on knowledge of the user (for example, a favorite sports team) and when they are: A Vulnerable to dictionary attacks B Shared by users C Created by the system manager D Based on a foreign language

Summary

This chapter has worked with a number of objects from ADONET that provide connectivity between data sources and web applications The basis for working with all data sources is the Connection object that abstracts the potential network and database technology so you do not have to have minute knowledge of how to build the connection Once the connection is in place, the DataAdapter helps to build the SQL statements needed to build the DataSet objects that bind to such server controls as the DataGrid The DataSet is a disconnected object, so once the DataSet is populated, the connection to the data source can be removed, making for less load on the server The xxxDataReader is the connected version it maintains the connection to the data source through the whole process One thing to remember for the exam is that the SQL NET Data Provider objects are used for Microsoft SQL Server 7 or higher, and that the OLE DB NET Data Provider objects are used for any data source that has an OLE DB provider (but not for Microsoft SQL Server) Also, the try catch finally structure is tested in the exam

1 What is the SQL equivalent of the DataSet relation object A XOR JOIN B CROSS JOIN C OUTER JOIN D INNER JOIN 2 Why should you close all database objects and set them to NULL before leaving the method where the objects were created A To ensure that the object s destructors are called B To ensure that the connection to the database is closed as soon as possible C To ensure that the objects can be reused D Good coding practice 3 What is the purpose of the following code segment

A back door is a potential weakness intentionally left in the security of a computer system or its software by its designers A True B False

if ( !IsPostBack ) { sqlDataAdapter1Fill(dsUsers1); DataGrid1DataBind(); }

through this process, then the rate would be so slow as to be synthetically useless Instead, once a single radical is formed, it can engage in a series of self-sustaining propagation steps to generate new compounds This is nicely illustrated with the radical bromination of methane (Figure 1116) The initiation step involves the homolytic cleavage of molecular bromine into two bromine radicals In principle, this step (at a costly 46 kcal/mol) must only occur once Afterwards, the bromine radical attacks methane, engaging in hydrogen atom abstraction to form hydrobromic acid and methyl radical (Step 1) The methyl radical, in turn, attacks molecular bromine (present in stoichiometric quantity), which suffers bromine atom abstraction and produces methyl bromide and regenerates bromine radical (Step 2) Notice that each of the propagation steps consumes stoichiometric reactant and generates stoichiometric product Turning our attention to polar chemistry, the most common representative of this class is the proton transfer, otherwise known as acid-base reactions There are three general

A To populate the DataAdapter the first time the web page is displayed B To populate the DataSet every time the web page is displayed C To populate the DataAdapter every time the web page is displayed D To populate the DataSet the first time the web page is displayed