Internet use has exploded in these five years since the first edition of this classic book was published. The economic world has pressed headlong into doing business on the Web. The security risks and the need to protect both business and personal data have never been greater.
Firewalls are critical components of today's computer networks; which are effectively protect a system from most Internet security threats. They keep damage on one part of the network--such as eaves dropping, a worm program, or file damage--from spreading to the rest of the network. Without the firewalls, network security problems can rage out of control, dragging more and more systems down.
the second edition describes:
Firewall technologies: packet filtering, proxying, network address translation, virtual private networks
Architectures such as screening routers, dual-homed hosts, screened hosts, screened subnets, perimeter networks, internal firewalls
Issues involved in a variety of new Internet services and protocols through a firewall
Email and News
File transfer and sharing services such as NFS, Samba