When troubleshooting duplex mismatches， which two are errors that are typically seen on the half duplexend？（）

A.excessive collisions
B.FCS errors
C.runts
D.late collisions

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单项选择题

Which configuration is used to enable root guard？（）

A.interface gig3/1 spanning-tree guard root
B.interface gig3/1 spanning-tree root guard
C.interface gig3/1 spanning-tree root-guard
D.interface gig3/1 spanning-tree root-guard default

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Which types of prefixes will a router running BGP most likely advertise to an IBGP peer， assuming it is not configured as a route reflector？（）

A. prefixes received from any other BGP peer and prefixes locally originated via network statements or redistributed
B. all prefixes in its routing table
C. prefixes received from EBGP peers and prefixes locally originated via network statements or redistributed
D. prefixes received from EBGP peers and prefixes received from route reflectors
E. prefixes received from other IBGP peers， prefixes received from EBGP peers， and prefixes redistributed to BGP
F. prefixes received from other IBGP peers and prefixes received from route reflectors

多项选择题

Which two statements are true about 802.1s？（）

A.802.1s supports a reduced number of spanning-tree instances.
B.802.1s has better convergence times than 802.1w.
C.802.1s does not support load balancing over the same physical topology.
D.The CPU utilization for 802.1s is lower than the CPU utilization for 802.1w.

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