题目内容
（请给出正确答案）
[主观题]
Which command gracefully shuts down the Junos OS？（）
A. request system reboot
B. request system logout
C. request system halt
D. restart gracefully
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A. It sends only five ping requests to the 172.18.1.1 destination.
B. It sends a continuous ping with a packet length of five bytes to the 172.18.1.1 destination.
C. It sends five rapid ping requests to the 172.18.1.1 destination.
D. It sends a continuous rapid ping with a packet length of five bytes to the 172.18.1.1 destination.
