You want to implement a high availability network using two Cisco routers. You also want to ensure that the stat of the WAN interfaces can be tracked in doing so. Which router redundancy protocol cannot be configured for interface tracking？ （）
- A、 GLBP
- B、 HSRP
- C、 RPR
- D、 VRRP
- E、 SLB
- F、 RPR+
- G、 None of the other alternatives apply
正确答案:D
答案解析:有
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