單項選擇題At which layer of the OSI model dose PPP perform?（）

A.Layer 3
B.Layer 4
C.Layer 2
D.Layer 5


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2.多項選擇題Which three statements about VTP features are true?（）

A.When properly configured,VTP minimizes VLAN misconfigurations and configuration inconsistencies
B.Each broadcast domain on a switch can have its own unique VTP domain
C.VTP works at Layer 3 of the OSI model and requires that a management VLAN IP address be configured.
D.When properly configured,VTP maintains VLAN configuration consistency and accelerates trunk link negotiation.
E.VTP pruning is used to increase available bandwidth in trunk links
F.Client,server,and transparent are valid VTP modes
G. To configure a switch to be part of two VTP domains,each domain must have its own passwords