Building a fully functional connection-oriented transport layer protocol. Looking back it was not even that big of a deal, but my first serious project as a stu

Building a fully functional connection-oriented transport layer protocol. Looking back it was not even that big of a deal, but my first serious project as a student. Not even close to the complexity of TCP, but it implemented all the basic features, including state of the art ARQ and rudimentary congestion control (TCP Reno). After about 2 months working on it EVERY DAY (an so many sleepless nights), I remember I almost cried when it first passed all the tests.