1. [单选题]路由器上激活端口的命令是（）
A. shutdown
B. no shutdown
C. up
D. noup
2. [单选题]After working on a router, some problems arise and you wish to view the commands that you recently entered. Which IOS command opens the history buffer and displays the most recently entered commands?
A. Show history
B. Show buffers
C. Show typed commands
D. Show terminal buffer
E. Show command
F. F. None of the above
