Template:Network Layer Service Model

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Network Architecture	Service Model	Guarantee ?				Congestion Feedback
		Bandwidth	Loss	Order	Timing
Internet	best effort	none	no	no	no	no (interferred via loss)
ATM	CBR	constant rate	yes	yes	yes	no congestion
ATM	VBR	guarantee rate	yes	yes	yes	no congestion
ATM	ABR	guarantee minimum	no	yes	no	yes
ATM	UBR	none	no	yes	no	no