Which WAN technology was designed to give homes and small business high speed digital dial-up service over already existing communication infrastructure?（）A、X25B、Frame RelayC、ATMD、ISDNE、ATXF、None of the above
Which WAN technology was designed to give homes and small business high speed digital dial-up service over already existing communication infrastructure?（）
- A、X25
- B、Frame Relay
- C、ATM
- D、ISDN
- E、ATX
- F、None of the above
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单选题Which technology is an example of the need for a designer to clearly define features and designedperformance when designing advanced WAN services with a service provider？（）A FHRP to remote branches.B Layer 3 MPLS VPNs routing.C Control protocols （for example Spanning Tree Protocol） for a Layer 3 MPLS service.D Intrusion prevention， QoS， and stateful firewall support network wide.
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