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Network Gateways connect two or more network segments to another segment, typically converting one network protocol or format to another.  Gateways work on layer 4 or greater (Protocols, sessions, application layer, etc.) as compared to network hubs (layer 1),  switches (layer 2) or routers (layer 3).

Examples of network gateways are

  • IP to SIP (Voice over IP) connecting the IP network to the Telephony network
  • Cloud Storage Gateway – connects the private network to cloud storage services using storage network protocols
  • IoT Gateway – collects data from IoT clients doing a store-and-forward and other data transformations and transfers the data over a LAN or WAN to a central repository