2. 计算机
  3. The Ezonexam network was assigned the Class C network 199.166.131.0 from the ISP. If the administrator at Ezonexam were to subne

The Ezonexam network was assigned the Class C network 199.166.131.0 from the ISP. If the administrator at Ezonexam were to subne

admin2009-05-19  61
问题 The Ezonexam network was assigned the Class C network 199.166.131.0 from the ISP. If the administrator at Ezonexam were to subnet this class C network using the 255.255.255.224 subnet mask, how may hosts will they be able to support on each subnet?
A. 14
B. 16
C. 30
D. 32
E. 62
F. 64
选项
答案C
解析 Explanation:
The subnet mask 255.255.255.224 is a 27 bit mask (11111111.11111111.11111111.11100000). It uses 3 bits from the last octet for the network ID, leaving 5 bits for host addresses. We can calculate the number of hosts supported by this subnet by using the 2n-2 formula where n represents the number of host bits. In this case it will be 5. 25-2 gives us 30.

Incorrect Answers:
A. Subnet mask 255.255.255.240 will give us 14 host addresses.

B. Subnet mask 255.255.255.240 will give us a total of 16 addresses. However, we must still subtract two addresses (the network address and the broadcast address) to determine the maximum number of hosts the subnet will support.

D. Subnet mask 255.255.255.224 will give us a total of 32 addresses. However, we must still subtract two addresses (the network address and the broadcast address) to determine the maximum number of hosts the subnet will support.

E. Subnet mask 255.255.255.192 will give us 62 host addresses.

F. Subnet mask 255.255.255.192 will give us a total of 64 addresses. However, we must still subtract two addresses (the network address and the broadcast address) to determine the maximum number of hosts the subnet will support.
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