42 Design and development of computer network efficiency improvement software; design and development of computer hardware, namely, network efficiency improvement hardware; computer support services in connection with hardware and software for interconnecting, managing, securing, monitoring, controlling, operating, and accessing local and wide area networks, computers, and telephony systems being troubleshooting in the nature of diagnosing computer hardware and software problems; design of computer hardware for data communication and recorded software sold therewith for translating and transmitting data, transporting and aggregating voice, data, and video communications across multiple network infrastructures and communications protocols, software defined wide area networks, wide area networks, and public and private networks; design of computer hardware and recorded software sold therewith for communicating audio, video and data between computers via a global computer network, wide-area computer networks, and peer-to-peer computer networks for upload, storage, retrieval, download, transmission and delivery of digital content; design of telecommunication technology computer hardware in the nature of communication servers, gateway routers, wireless communication devices, antennas, and network hubs; design of computer network software, and computer hardware in the nature of switches, adapters, hubs, controllers; computer software design; product testing of computers, telecommunications technology, networks, computer software, and network security technology; engineering, technological research and technological advisory services relating to computers, telecommunications technology, networks, computer software, computer programming, and network security; consulting in the fields of computer software and network security; computer security consultancy services for computer and telephony systems