Analysis of information sources in references of the Wikipedia article "Connectionless communication" in English language version.
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The LLC layer provides connectionless and connection-oriented data transfer. Connectionless data transfer is commonly referred to as LLC type 1, or LLC1... Connection-oriented data transfer is referred to as LLC type 2, or LLC2.
APPN/HPR ... supports nondisruptive route switching for failure recovery and connectionless intermediate routing of packets.