加油好男儿，哈哈
point-to-point serial IP connections:
serial link internet protocol(SLIP)
ITU-T standard protocol with error-correction:
X.25
standard-based, host to network over aynch/sync connections:
point-to-point protocol(PPP)
proprietary router-to-router corrections:
high level data link(HDLC)
international standard cell switching protocol:
asynchronous transfer mode
high performance, packet switched protocol:
Frame relay
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