You are using VTP version 2 in your network to transport VLAN information between switches. When adding a switch to the network that has been used in the lab previously， you notice that a lot of the existingVLANs have been deleted or replaced with other names. What can you do to prevent this from happeningin the future， without losing all VTP features that you are using today？（）

单项选择题WhichofthesebestidentifiesthetypesofprefixesarouterrunningBGPwilladvertisetoanEBGPpeer？（）

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

多项选择题Whentroubleshootingduplexmismatches，whichtwoareerrorsthataretypicallyseenonthehalfduplexend？（）

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

单项选择题Whichconfigurationisusedtoenablerootguard？（）

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

单项选择题WhichtypesofprefixeswillarouterrunningBGPmostlikelyadvertisetoanIBGPpeer，assumingitisnotconfiguredasaroutereflector？（）

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Whichtwostatementsaretrueabout802.1s？（）

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.