They include protocols designed to operate over dedicated point-to-point, multipoint, and multi-access switched services such as Frame Relay.

　
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  • 它們包括設計來(lái)在專(zhuān)屬的點(diǎn)對點(diǎn)；多點(diǎn)和諸如訊框中繼的多存取交換服務(wù)上運作的協(xié)定.
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