单项选择题

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？（）

A.configure a hard-to-guess VTP domain name
B.use a hard-to-guess VTP password
C.use VTP transparent mode
D.implement VTP version 3

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单项选择题

Which of these best identifies the types of prefixes a router running BGP will advertise to an EBGP peer？（）

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

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

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