JN0-100

单选题You have been asked to use a 28 bit subnet mask to segment the following network block: 108.12.5.0. How many usable hosts per sub-net could you create?（）A 10 hostsB 14 hostsC 12 hostsD 16 hosts

题目
单选题
You have been asked to use a 28 bit subnet mask to segment the following network block: 108.12.5.0. How many usable hosts per sub-net could you create?（）
A

10 hosts

B

14 hosts

C

12 hosts

D

16 hosts

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相似问题和答案

第1题：

The 213.115.77.0 network was subnetted using a /28 subnet mask. How many usable subnets and host addresses per subnet were created as a result of this?

A. 2 networks with 62 hosts

B. 6 networks with 30 hosts

C. 16 networks and 16 hosts

D. 62 networks and 2 hosts

E. 14 networks and 14 hosts

F. None of the above


正确答案：F
F 解析：Explanation:
A class C subnet with a 28 bit mask requires 4 bits for the network address, leaving 4 bits for host addresses. Using the 2n-2 formula (24-2 in this case) we have 14 host addresses and 16 network addresses.

Incorrect Answers:
A. This would be the result of a /26 network mask
B. This would be the result of a /27 network mask
C. Remember we need to always subtract two for the network and broadcast addresses, so this answer is incorrect.
D. This would be the result of a /30 network mask.

第2题：

You have been asked to use a 23－bit network mask to segment the network block 209.18.12.0. How many usable host addresses will there be per subnet?()

A. 510

B. 1022

C. 2046

D. 8190


参考答案：A

第3题：

The 201.145.32.0 network is subnetted using a /26 mask. How many networks and IP hosts per network exists using this subnet mask?

A．4 networks and 64 hosts

B．64 networks and 4 hosts

C．4 networks and 62 hosts

D．62 networks and 2 hosts

E．6 network and 30 hosts


正确答案：C
解析：Explanation:
A class C network with a 26 bit mask requires 2 bits for the network address, leaving 6 bits for host addresses. Using the 2n-2 formula (22 for the network and 26-2for hosts) we have 4 network addresses and 62 host addresses.

Incorrect Answers:
A, B: This is not a possible combination. No network mask will provide for 64 usable hosts, because we must always subtract 2 for the network and broadcast address.
D. This would be the result of a /30 mask.
E. This would be the result of a /27 network mask.

第4题：

How many usable sub network and usable hosts per subnet result in the network address 201.105.13.0 is sub netted with a mask of ／26? ()

A. 64 network and 4 hosts

B. 4 network and 64 hosts

C. 2 network and 62 hosts

D. 62 network and 2 hosts


参考答案：C

第5题：

You have been asked to use a 28 bit subnet mask to segment the following network block: 108.12.5.0. How many usable hosts per sub－net could you create?()

A.10 hosts

B.14 hosts

C.12 hosts

D.16 hosts


参考答案：B

第6题：

You have a class B network with a 255.255.255.0 mask. Which of the statements below are true of this network? (Select all valid answers)

A. There are 254 usable subnets.

B. There are 256 usable hosts per subnet.

C. There are 50 usable subnets.

D. There are 254 usable hosts per subnet.

E. There are 24 usable hosts per subnet.

F. There is one usable network.


正确答案：AD
A,D 解析：Explanation:
The default subnet mask for Class B is 255.255.0.0. Thus an extra 8 bits have been used for the network portion, leaving 8 for hosts. The 2n - 2 formula (28 - 2 in this case for both the network and IP hosts) gives us 254 networks and 254 hosts per network.

Incorrect Answers:
B: We must remember to always subtract 2 (one for the network, and one for the broadcast) so the result is 254, not 256.

C, E: No possible network mask would give us this exact number of subnets or hosts.

F: This would be true if this were a class C network, not a class B.

第7题：

You have been asked to use a 25 bit subnet mask to segment the following network block:209.18.12.0.How many usable will there be per subnet?()

A.2 hosts

B.120 hosts

C.126 hosts

D.255 hosts


参考答案：C

第8题：

You need subnet a Ezonexam network segment. How many subnetworks and hosts are available per subnet if you apply a /28 mask to the 210.10.2.0 class C network?

A. 30 networks and 6 hosts.

B. 6 networks and 30 hosts.

C. 8 networks and 32 hosts.

D. 32 networks and 18 hosts.

E. 16 networks and 14 hosts.

F. None of the above


正确答案：E
E 解析：Explanation:
A 28 bit subnet mask (11111111.11111111.11111111.11110000) applied to a class C network uses a 4 bits for networks, and leaves 4 bits for hosts. Using the 2n-2 formula, we have 24-2 (or 2x2x2x2-2) which gives us 14 for the number of hosts, and the number of networks is 24 = 16.

Incorrect Answers:
A. This would be the result of a /29 (255.255.255.248) network.

B. This would be the result of a /27 (255.255.255.224) network.

C. This is not possible, as we must subtract two from the subnets and hosts for the network and broadcast addresses.

D. This is not a possible combination of networks and hosts.

第9题：

You have been asked to use a 30 bit subnet mask to segment the following network block: 108.12.5.0. How many useable subnetworks and usable hosts could be created?()

A.32 networks with 8 hosts

B.62 networks with 2 hosts

C.30 networks with 16 hosts

D.32 networks with 14 hosts


参考答案：B

第10题：

The IP network 210.106.14.0 is subnetted using a /24 mask. How many usable networks and host addresses can be obtained from this?（）

  • A、1 network with 254 hosts
  • B、4 networks with 128 hosts
  • C、2 networks with 24 hosts
  • D、6 networks with 64 hosts
  • E、8 networks with 36 hosts

正确答案:A

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