单项选择题
How do you ping from configuration mode?（）
A. [edit interfaces] user@router# run ping 1.1.1.1 B. [edit interfaces] user@router# ping 1.1.1.1 C. [edit interfaces] user@router# up ping 1.1.1.1 D. [edit interfaces] user@router# exit ping 1.1.1.1
单项选择题 By default, which character indicates the UNIX shell prompt?（）
单项选择题 By default, which character indicates the configuration mode prompt?（）
单项选择题 Which statement is true about the forwarding plane?（）
