In the last chapter, I talked about restricting access based on the user ; in this chapter, I talk about restricting access to certain kinds of content. Such restrictions include not allowing people to access certain kinds of sites (e.g., pornography, news), preventing people from accessing specific types of content (e.g., RealAudio, MP3), and scanning content for viruses. I also discuss the various Security Servers for HTTP, FTP, SMTP, and TCP in some detail. By the end of this chapter, you should be able to:
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