What is the OSPF default frequency,in seconds,at which a cisco router sends hello packets on a multi-access network?（）

Which dose the frame-relay interface-dlci command configure?（）

A. remote DLCI on the main interface
B. local DLCI on the main interface
C. local DLCI on the subinterface
D. remote DLCI on the subinterface

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Which command can be a router to verify the layer 3 path to a host?（）

A. traceroute address
B. tracert address
C. ssh address
D. telnet address

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