单选题What is the purpose of a network mask?（）A It is used to identify the maximum hop count of a subnetwork.B It is used to identify an IP address as either private or public.C It is used to identify the network to which an IP address belongs.D It is used t
题目
单选题
What is the purpose of a network mask?（）
A
It is used to identify the maximum hop count of a subnetwork.
B
It is used to identify an IP address as either private or public.
C
It is used to identify the network to which an IP address belongs.
D
It is used to identify the total number of bits present in an IP address.