Which statement best describes Cisco supervisor engine redundancy using Stateful Switchover？（）
- A、Switchover ensures that Layer 2 through Layer 4 traffic is not interrupted
- B、Redundancy requires BGP， OSPF， EIGRP， or IS-IS
- C、Redundancy provides fast supervisor switchover for all Cisco Catalyst 6500 series switches
- D、Switchover can be caused by clock synchronization failure between supervisors
正确答案:D
答案解析:有
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