Impact
In showing that internetworking ideas were feasible, in being influential in the early work on TCP/IP, and as the foundation for the later XNS protocols, PUP was very influential. However, its biggest impact was probably as a key component of the office of the future model first demonstrated at Xerox PARC; that demonstration would not have been anything like as powerful as it was without all the capabilities that a working internetwork provided.
The Gateway Information Protocol's descendant, RIP, (somewhat modified to match the syntax of addresses of other protocol suites), remains in wide use today in other protocol suites. One version of RIP served as one of the initial so-called interior gateway protocols for the growing Internet, before the arrival of the more modern OSPF and IS-IS. It is still in use as an interior routing protocol, in small sites with simple requirements.
Read more about this topic: PARC Universal Packet
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