單項(xiàng)選擇題

When configuring a serial interface on a router, what is the default encapsulation?（）

A. atm-dxi
B. frame-relay
C. hdlc
D. lapb
E. ppp

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單項(xiàng)選擇題

Which command displays CPU utilization?（）

A. show protocols
B. show process
C. show system
D. show version

單項(xiàng)選擇題

Which command is used to debug a ping command?（）

A. debug icmp
B. debug ip icmp
C. debug tcp
D. debug packet

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