DCCP promised the best of both worlds—UDP's speed with TCP's manners. It solved a real problem, got standardized, and then watched from the sidelines as the Internet found other ways forward.
SCTP solves problems TCP can't: independent streams that don't block each other, automatic failover across network paths, and real message boundaries. So why isn't it everywhere?
ICMP is how the network talks about itself—reporting errors, testing reachability, and enabling tools like ping and traceroute that turn packet death into diagnostic insight.
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