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To overcome the performance and scalability problems that CGI brings, Microsoft developed a new way for developers to build scalable applications. This highperformance alternative is called the Internet Server Application Programming Interface (ISAPI). Instead of housing functionality in executable files, ISAPI uses DLLs. Using DLLs instead of executable programs has some definite performance and scalability advantages. There are two distinct types of ISAPI DLLs: ISAPI extensions and ISAPI filters. ISAPI extensions are explicitly called in a URL sent to the IIS server, as shown here: http://localhost/sayhelloisapi/sayhelloisapi.dll The ISAPI extension could also be called with arguments that will allow a single ISAPI extension to perform multiple tasks. Just as in the CGI example, the directory must have execute permissions enabled, or the DLL will be downloaded to the client rather than run

A. Correct: The DropDownList control can display a list that uses a minimum amount of space. B. Incorrect: The RadioButtonList control does not provide a list in a minimum amount

son that L2TP/IPSec requires certificates or preshared secret keys it needs to set up the encryption tunnel prior to getting password information, unlike PPTP, which uses the password to create the encryption key hash.

c. Incorrect: The FormView control does not provide a list in a minimum amount of space. D. Incorrect: The TextBox control does not provide a list.

A. Correct: You use a partial class to extend auto-generated code for your data context. B. Correct: You create a metadata class to be used for marking specific fields in your data

context with attributes. You use this class to decorate the Invoice partial class by using MetadataType.

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encryption algorithm and uses 40-, 56-, or 128-bit encryption keys. Stream ciphers encrypt data as a bit stream. Conversely, L2TP/IPSec connections use the Data Encryption Standard (DES), which is a block cipher that uses either a 56-bit key (for DES) or three 56-bit keys (for 3DES). Block ciphers encrypt data in discrete blocks (64-bit blocks, in the case of DES).

on the server ISAPI extensions are typically used to process client requests and output a response as HTML, which is very similar to the way CGI programs are used ISAPI filters perform a function that can t be directly duplicated with CGI applications ISAPI filters are never explicitly called; instead, they are called by IIS in response to certain events in the life of a request.

2. 3. c. Correct: You use this class to indicate that InvoiceAnnotations defines the metadata to be

D. Incorrect: You do not add this attribute to the class used to define the metadata. This attribute

PPTP connections require only user-level authentication through a PPPbased authentication protocol. L2TP/IPSec connections require the same user-level authentication and, in addition, computer-level authentication using computer certificates. The computer-level authentication is usually in the form of certificates that allow the IPSec protocol to set up encryption prior to data passing through the tunnel. Strong Password Methodology Dictionary attacks occur when a hacker captures packets encrypted with the password hash and runs a program to try to crack that encryption against well known dictionary words. If the user does not use strong password methods and does not change passwords on a regular basis, the session can be potentially easily compromised. Strong passwords are composed of alpha, numeric, and symbol characters with both uppercase and lowercase alpha characters. For example: if the client uses computer as its password, the cli ent is very susceptible to dictionary attacks because this word can be easily guessed. On the other hand, if the client uses ComPuTer!1 as the password, there is a much lower chance of an intruder guessing the password. When using strong password methods, PPTP can have as much encryption strength as L2TP/IPSec.

can be used to indicate whether an individual entity should be included in the scaffold. Correct Answer: D

name to find your control in the FieldTemplates folder and render it accordingly. Correct Answers: C and D

The developer can request that an ISAPI filter be called whenever any of the following events occur: When the server has preprocessed the client headers When the server authenticates the client When the server is mapping a logical URL to a physical URL Before raw data is sent from the client to the server After raw data is sent from the client to the server but before the server processes it When the server logs information When the session is ending As with any filter, ISAPI filters should request only the notifications it requires and process them as quickly as possible One of the more common uses of ISAPI filters is to provide custom authentication Another use is to modify the HTML that will be sent to the client For example, an ISAPI filter could be used to change the background color of each page.

not limited to the InvoiceNumber field).

The following is a list of the advantages of using L2TP/IPSec versus PPTP in Win dows Server 2003:

1. 2. 3.

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