.
:
- .
- .
, large-scale hub-and-spoke . hub-and-spoke .

, , : . ( ) -, A B, , C N, . , - , , Quality of Service. , .
, , , , . , , . point-to-multipoint ( , Frame Relay) -. point-to-multipoint, - A B , (, Ethernet). spoke - - point-to-point. . , , - . .
- (SD-WAN) . DMVPN, Dynamic Multipoint Virtual Private Network (DMVPN) Cisco, , . , , .
SD-WAN - over-the-top. SDWAN :
SD-WAN, :
- SD-WAN " ". , SD-WAN , - ( backhaul).
- SD-WAN .
- SD-WAN , , , , -.
SD-WAN , . , "" - ( , - , Ethernet) " " , , , ( ), .