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Ezonexam has a Class C network and you need ten subnets. You wish to have as many addresses available for hosts as possible. Which one of the following subnet masks should you use?A．255.255.255.192B．255.255.255.224C．255.255.255.240D．255.255.255.248E．None

题目

Ezonexam has a Class C network and you need ten subnets. You wish to have as many addresses available for hosts as possible. Which one of the following subnet masks should you use?

A．255.255.255.192

B．255.255.255.224

C．255.255.255.240

D．255.255.255.248

E．None of the above

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相似问题和答案

第1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2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3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4题：

You work as network consultant. Your customer, TestKing Inc, has a class C network license. TestKing wants you to subnet the network to provide a separate subnet for each of its 5 departments. Each subnet must support at least 24 hosts.Which network mask should you use?（）

A.255.255.255.192

B.255.255.255.224

C.255.255.255.240

D.255.255.255.248

E.255.255.255.252

F.255.255.255.254


参考答案：B

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：

Your network uses the172.12.0.0 class B address. You need to support 459 hosts per subnet, while accommodating the maximum number of subnets. Which mask would you use?

A．255.255.0.0.

B．255.255.128.0.

C．255.255.224.0.

D．255.255.254.0.

E．None of the above


正确答案：D
解析：Explanation:Toobtain459hoststhenumberofhostbitswillbe9.Thiscansupportamaximumof510hosts.Tokeep9bitsforhostsmeansthelastbitinthe3rdoctetwillbe0.Thisgives255.255.254.0asthesubnetmask.

第8题：

You have an SQL query that takes one minute to execute. You use the following code segment to execute theSQL query asynchronously.Dim ar As IAsyncResult = cmd.BeginExecuteReader()You need to execute a method named DoWork() that takes one second to run while the SQL query is executing.DoWork() must run as many times as possible while the SQL query is executing.Which code segment should you use?（）

A.

B.

C.

D.


参考答案：B

第9题：

Given that you have a class B IP address network range, which of the subnet masks below will allow for 100 subnets with 500 usable host addresses per subnet?

A．255.255.0.0

B．255.255.224.0

C．255.255.254.0

D．255.255.255.0

E．255.255.255.224


正确答案：C
解析：Explanation:
Using the 2n-2 formula for host addresses, 29-2 = 510 host address, so a 9-bit subnet mask will provide the required number of host addresses. If these 9 bits are used for the hosts in a class B network, then the remaining 7 bits are used for the number of networks.

Again using the 2n-2 formula, we have 2n-2 = 126 networks that are available.

Incorrect Answers:
A. This will provide for only 1 network with 216-2 = 65534 hosts
B. This will provide for 6 networks with 8190 host addresses.
D. This will provide 254 networks and 254 hosts.
E. This will provide 2046 different networks, but each network will have only 30 hosts.

第10题：

You have a Class C network, and you need ten subnets. You wish to have as many addresses available for hosts as possible. Which one of the following subnet masks should you use?()

A. 255.255.255.192

B. 255.255.255.224

C. 255.255.255.240

D. 255.255.255.248

E. None of the above


参考答案：C

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