Which of the following protocols would be used to test if one host is reachable by another host， by sending echo requests and waiting for echo replies？（）

Asmallpushbuttontypicallyfoundontheinsideofaservercasei...

单项选择题A small push button typically found on the inside of a server case is MOST likely used for which of the following purposes？（）

Which of the following will allow devices to be added w...

单项选择题Which of the following will allow devices to be added without turning the server off?（）

WhichofthefollowingisapublicIPaddress？（）A.172.31.254.40...

单项选择题Which of the following is a public IP address？（）