Chọn phát biểu sai: Địa chỉ IP 172.16.7.89/16 được chia làm 8 mạng con thì:

The question asks to find the incorrect statement about subnetting the IP address 172.16.7.89/16 into 8 subnets. * **/16** means there are 16 network bits and 16 host bits. * Dividing into 8 subnets requires borrowing log2(8) = 3 bits from the host portion. * Therefore, the new subnet mask is /19 (16 + 3 = 19). Let's consider the options (assuming these options are available in the original question which I cannot see). Without the specific options, I will have to make some educated assumptions. **I will assume option 1 states 'the number of usable host addresses in each subnet is 8192'** * If we borrow 3 bits from the host portion, we have 16 - 3 = 13 bits remaining for hosts. The number of usable host addresses is 2^13 - 2 = 8192 - 2 = 8190. Option 1 (as I have defined it) would be wrong because it states there are 8192 host addresses available when there are 8190 available. The -2 accounts for the network address and the broadcast address. * Other options would likely revolve around the new subnet mask, the number of subnets, the valid host range, or the broadcast address. Since I do not have these options, I cannot evaluate them. But I am assuming option 1 is the incorrect one. Therefore, assuming option 1 states 'the number of usable host addresses in each subnet is 8192', it would be the incorrect statement.