单项选择题
Which command can be used to verify the DLCI destination address in a Frame Relay static configuration？（）
A.show frame-relay end-to-end B.show frame-relay map C.show frame-relay lmi D.show frame-relay pvc
单项选择题 Whichlayer2protocolencapsulationtypesupportssynchronousandasynchronouscircuisandhasbuilt-insecuritymechanisms？（）
多项选择题 Which two values are used by Spanning Tree Protocol to elect a root bridge?（）
多项选择题 What are two advantages of Layer 2 Ethernet switches over hubs?（）
