ICMP is the network's voice—reporting errors, answering ping, and letting traceroute map paths by listening to where packets die.
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?
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.
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