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单选题What is used to segment larger networks into smaller networks?（）A supernet masksB subnet masksC wildcard masksD route filtering

题目
单选题
What is used to segment larger networks into smaller networks?（）
A

supernet masks

B

subnet masks

C

wildcard masks

D

route filtering

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第1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2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3题：

On the topic of VLSM, which one of the following statements best describes the concept of the route aggregation?

A．Deleting unusable addresses through the creation of many subnets.

B．Combining routes to multiple networks into one supernet.

C．Reclaiming unused space by means of changing the subnet size.

D．Calculating the available host addresses in the AS.

E．None of the above


正确答案：B
解析：Explanation:
In the networking world route aggregate means combining routes to multiple networks into one. This is also known as route summarization or supernetting. It is normally used to reduce the number of route entries in the routing table by advertising numerous routes into one larger route.

第4题：

IP routing protocols， such as OSPF and Enhanced EIGRP， are used primarily in network designs that contain entry and exit points to the network from service providers. What is a common trait of IP routing  protocols？（）  

  • A、 They add needed overhead in smaller deployments.
  • B、 They are essential for optimum and redundant forwarding.
  • C、 They are used primarily in larger network designs，to support different networks and single entry and  exit points.
  • D、 They are usually necessary in smaller deployments.

正确答案:C

第5题：

Refer to the exhibit. A Boston company bought th e assets of a New York company and is trying to route traffic between the two data networks using EIGRP. The show command output shows that traffic will not flow between the networks. As a network consultant, you were asked to modify the configuration a nd certify the interoperability of the two networks. For traffic to flow from subnet 172.16.8.0/24 to the 172.16.16.0/24 subnet, which configuration change do you recommend?（）

A. Turn off autosummarization on routers N1 and B1.

B. Add IP summary addre sses to the Internet - pointing interfaces of routers N1 and B1.

C. Turn off autosummarization on routers N2 and B2.

D. Add wildcard masks to the network commands on routers N2 and B2.


参考答案：A

第6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7题：

What is used to segment larger networks into smaller networks?()

A.supernet masks

B.subnet masks

C.wildcard masks

D.route filtering


参考答案：B

第8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9题：

What are two characteristics of RIPv2?()

A. classful routing protocol

B. variable-length subnet masks

C. broadcast addressing

D. manual route summarization

E. uses SPF algorithm to compute path


参考答案：B, D

第10题：

On the topic of VLSM, which one of the following statements best describes the concept of the route aggregation?（）

  • A、Deleting unusable addresses through the creation of many subnets.
  • B、Combining routes to multiple networks into one supernet.
  • C、Reclaiming unused space by means of changing the subnet size.
  • D、Calculating the available host addresses in the AS.

正确答案:B

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