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Large networks, such as MITnet, are typically divided into smaller segments called subnetworks-- subnets for short--to enhance performance and facilitate administration and maintenance. Each distinct subnet at MIT typically corresponds to a building.
Networked devices, such as computers and printers use a variety of standardized methods to communicate with one another, called networking protocols. In order for devices on one subnet to communicate with others on another subnet using a specific networking protocol, the hardware connecting these subnets to the backbone and to one another has to be able to transmit the information back and forth across subnets. Additionally, the protocol being used should allow being routed in this manner. Hardware devices, which perform this function are commonly known as routers.
AppleTalk is one such networking protocol designed more than fifteen years ago by Apple for providing peer-to-peer communication between various network devices, such as computers and printers. Additionally, it provides for the creation of collections of AppleTalk devices under virtual groupings called AppleTalk zones to aid in organizing available network resources. Although AppleTalk zones may contain devices from anywhere across the network, AppleTalk zones on MITnet, typically correspond to a subnet (building) and are named after that building. (Please note that a few minor exceptions do exist).
In order for AppleTalk devices within one AppleTalk zone to access others in another zone or subnet using the AppleTalk protocol, the communication between them has to be routed across the backbone network by the routers. Currently MITnet routers provide this service, allowing devices to access one another using the AppleTalk protocol across AppleTalk zones throughout MITnet, including Tether (MIT's PPP-based remote access service).
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