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At which lay er of the OSI model does the Spanning Tree Protocol (STP) operate at()
A.Lay er 5
B.Lay er 4
C.Lay er 3
D.Lay er 2
E.Lay er 1
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At which lay er of the OSI model does the Spanning Tree Protocol (STP) operate at（）A、Lay er 5B、Lay er 4C、Lay er 3D、Lay er 2E、Lay er 1
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Which three of the following network features are methods used to achieve high availability（）A、Spanning Tree Protocol（STP）B、Delay reductionC、Hot Standby Routing Protocol（HSRP）D、Dynamic routing protocolsE、Quality of Service（QoS）F、Jitter management
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Spanning Tree Protocol IEEE 802.1s defines the ability to deploy which of these？ （）A、one global STP instance for all VLANsB、one STP instance for each VLANC、one STP instance per set of VLANsD、one STP instance per set of bridges
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单选题At which layer of the OSI model does the Spanning Tree Protocol （STP） operate at？（）A
Layer 5B
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单选题At which lay er of the OSI model does the Spanning Tree Protocol (STP) operate at（）A
Lay er 5B
Lay er 4C
Lay er 3D
Lay er 2E
Lay er 1
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one global STP instance for all VLANsB
one STP instance for each VLANC
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单选题Which of the following specifications is a companion to the IEEE 802.1w Rapid Spanning Tree Protocol （RSTP） algorithm， and warrants the use multiple spanning-trees？ （）A
IEEE 802.1s （MST）B
IEEE 802.1Q （CST）C
Cisco PVST+D
IEEE 802.1d （STP）E
None of the other alternatives apply
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