Concerns over network security are giving rise to a new breed of Internet products aimed at foiling the efforts of hackers and cyberterrorists. The products reflect a newfound awareness — sharpened in recent weeks by a spate of high-profile hacking incidents — that computer networks in corporate and government environments are very often chock-full of security holes.

Three such products were announced this past week. Cisco Systems Inc. (San Jose, Calif.) rolled out a series of a multigigabit security modules for its network switches. Startup Bodacion Technologies Inc. (Barrington, Ill.) said it has developed what may be the first unhackable network server, aimed primarily at government agencies concerned about the potential of cyberterror. And Pacific Northwest National Laboratory said it has created a software program that combs through Web sites to identify sensitive information that needs to be removed.

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