单选题What is the purpose of a network mask?()AIt is used in conjunction with the wildcard mask to determine the number of hosts on a networkBIt is used to define which parts of the IP address are allocated to host addresses and network prefixesCIt is used to hide subnets from external networks by masking the subnets with NATDIt is used to differentiate a network as a classful network or a classless network

单选题
What is the purpose of a network mask?()
A

It is used in conjunction with the wildcard mask to determine the number of hosts on a network

B

It is used to define which parts of the IP address are allocated to host addresses and network prefixes

C

It is used to hide subnets from external networks by masking the subnets with NAT

D

It is used to differentiate a network as a classful network or a classless network


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