Foundation Summary
The "Foundation Summary" provides a convenient review of many key concepts in this chapter. If you are already comfortable with the topics in this chapter, this summary can help you recall a few details. If you just read this chapter, this review should help solidify some key facts. If you are doing your final preparation before the exam, this summary provides a convenient way to review the day before the exam.The filter java command lets you filter Java applets out of HTTP traffic before it reaches a user's web browser. The Java applets are commented out in th171 information that the user's web browser receives so that it will not attempt to process them. Similarly, the filter activex command enables you to filter ActiveX objects and othe184 <OBJECT> usages from inbound HTTP packets.The filter url command lets you prevent outbound users from accessing World Wide Web URLs that you designate using one of the following URL-filtering server applications:- Websense Enterprise Supported by PIX Firewall Version 5.3 or later
- N2H2 Sentian Supported by PIX Firewall Version 6.2
When a user issues an HTTP request to a website, the PIX Firewall sends the request to the web server and to the URL-filtering server at the same time. If the URL-filtering server permits the connection, the PIX Firewall allows the reply from the website to reach the user who issued the original request. If the URL-filtering server denies the connection, the PIX Firewall redirects the user to a block page, indicating that access was denied. |
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