本书涵盖了防火墙的技术、策略和市场上流行的所有主要的防火墙产品。与其他书相比，此书范围更广，适用性更强。此外，它提供了各种协议包括即将来临的IPv6及如何构造防火墙等的全面指导。-The book covers the popular firewall technology, strategy and all major firewall products in market. Compared with other books, this book has a wider range of applicability stronger. In addition, it provides a variety of protocols, including the overall guidance of the upcoming IPv6 and how to construct a firewall.