data communication products for networking applications, namely, modems, multiplexers, switches for voice and data and packet switching, converters, sharing devices, hubs, repeaters, bridges, routers, connectors, patch panels, networking software, terminal servers, monitoring and test equipment, videoconferencing equipment, namely, video gateways for LAN/WAN videoconferencing, video gateways for LAN videoconferencing, video interface units, video stations, video interface cards and video communication software; computer network security hardware, namely, an end-to-end enterprise-wide security system which is a comprehensive internetworking security, data security and security management aid, encrypting firewall that supports subnet to subnet security in TCP/IP environments, featuring automatically synchronized devices spread throughout the user's network; local area networks consisting of modular intelligent hubs, LAN network management software and modular FDDI hubs