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What are the usable hosts on the

题目

What are the usable hosts on the .128.0/19 network?（）

  • A、.128.1 through .143.254
  • B、.128.128 through .134.254
  • C、.128.0 through .134.254
  • D、.128.1 through .159.254
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第1题：

What are the usable hosts on the .128.0／19 network?()

A. .128.1 through .143.254

B. .128.128 through .134.254

C. .128.0 through .134.254

D. .128.1 through .159.254


参考答案：D

第2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3题：

You have a class C network, and you need to design it for 5 usable subnets with each subnet handling a minimum of 18 hosts each. Which of the following network masks should you use?

A．225.225.224.0.

B．225.225.240.0.

C．225.225.255.0.

D．255.255.255.224

E．225.225.255.240


正确答案：D
解析：Explanation:ThedefaultsubnetmaskforclassCnetworkis255.255.255.0.Ifonehastocreate5subnets,then3bitsarerequired.With3bitswecancreate8subnets.Theremaining5bitsareusedforHosts.Onecancreate30hostsusing5bitsinhostfield.Thismatcheswiththerequirement.IncorrectAnswers:A,B:ThisisanillegalsubnetmaskforaclassCnetwork,asthethirdoctetcannotbedividedwhenusingaclassCnetwork.C:ThisisthedefaultsubnetmaskforaclassCnetwork.Itprovidesforonenetwork,with254usablehostIPaddresses.E:Thissubnetmaskwillprovidefor14separatenetworkswith14hostseach.Thisdoesnotmeettherequirementofaminimumof18hosts.

第4题：

Which three IP addresses can be assigned to hosts if the subnet mask is ／27 and subnet zero is usable?()

A.10.15.32.17

B.17.15.66.128

C.66.55.128.1

D.135.1.64.34

E.129.33.192.192

F.192.168.5.63


参考答案：A, C, D

第5题：

What is the last usable IP address in the 218.6.0.0／17 network?()

A. 218.6.125.254

B. 218.6.126.254

C. 218.6.127.254

D. 218.6.128.254


参考答案：C

第6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7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8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9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10题：

Which three IP addresses can be assigned to hosts if the subnet mask is /27 and subnet zero is usable？（）

  • A、 10.15.32.17
  • B、 17.15.66.128
  • C、 66.55.128.1
  • D、 135.1.64.34
  • E、 129.33.192.192
  • F、 192.168.5.63

正确答案:A,C,D

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