QUESTION NO: 61 DRAG DROP
TestKing has three locations and has plans to redesign the network accordingly. The
networking team received 192.168.15.0 to use as the addressing for entire network
from the administrator. After subnetting the address, the team is ready to assign the
address.
Being mindful of these goals, drag the host addresses on the left to the correct router
interface. One of the routers is partially configured. Move the mouse over a router
to view its configuration (** This information is missing**). Not all of the host
addresses on the left will be used.



K公司有三个分部，准备重新设置网络划分子网，管理员给网络分配的地址是192.168.15.0
管理员计划配置启动全0子网和RIPv2作为路由协议，作为网络管理团队的一员，你必须分配地址的同时必
须保留一些地址给将来备用
图中看到：一个路由器做了一些配置，将合适的主机地址放入正确的位置(不是所有地址都用上)

解析：RIPv2支持VLSM，可以使用不同的掩码，
3个路由器连接3个子网，需要的主机数目分别是：101,11,26
2的7次方－2＝126 可见/25适合101
2的5次方－2＝30 可见/27适合26
2的4次方－2＝14 可见/28适合11
两个路由器之间串行链路用/30
虽然用了子接口,但思路相同

QUESTION NO: 62
Refer to the exhibit. All of the routers in the TestKing network are configured with
the "ip subnet-zero" command. Which network addresses should be used for Link
A and Network A? (Choose two)
看图说话：TK公司网络的所有路由器均配置了ip subnet-zero，下面哪两个网络地址可以用来配置Link A

和Network A

A. Link A - 172.16.3.0/30
B. Link A - 172.16.3.40/30
C. Network A - 172.16.3.128/25
D. Link A - 172.16.3.112/30
E. Network A - 172.16.3.48/26
F. Network A - 172.16.3.192/26

解析：貌似看到不一样的题了，但只不过是形式不同。
Link A 自然是串行掩码
Network A 需要120个主机地址，2的7次方-2=126 刚刚好

答案： A，C

明白了谢谢楼主的热心指点

顶，继续支持赵高老师。

QUESTION NO: 63
A new subnet with 60 hosts has been added to the TestKing network shown below.
Which subnet address should this network use to provide enough usable addresses
while wasting the fewest addresses?



如图：60主机需要加入TK公司网络，那么该子网应该怎样划分址以保证有足够的地址供使用同时浪费最少？

A. 192.168.1.56/27
B. 192.168.1.64/26
C. 192.168.1.56/26
D. 192.168.1.64/27

解析：60台主机，2的6次方-2=62,仅仅浪费2个地址，但是答案中有2个/26，不过C和192.168.1.48/28地址冲突。

答案：B

QUESTION NO: 64
In the TestKing network shown below, which subnet address could a network
administrator use for Network A on the left?



TK公司网络如下，在左边的哪一个子网地址可以被网管使用？
A. 192.168.35.64/26
B. 192.168.35.32/27
C. 192.168.35.128/26
D. 192.168.35.192/27
E. 192.168.35.96/27

解析：62个主机,掩码自然是/26 选项中A和使用中的192.168.35.64/28冲突。

答案：C

QUESTION NO: 65
The TestKing network administrator has designed the IP scheme as shown in the
diagram below. What effect will this addressing scheme have on the network?



TK公司的网络管理员已经按照下图分配了IP地址，该方案会对网络有什么影响?

A. IP traffic between subnet A and B will be prevented.
B. Routing information will not be exchanged.
C. The addressing scheme will allow all IP traffic between the LANs.
D. IP traffic between all the LANs will be prevented.

解析：可见公司用的是RIP v2路由协议，该协议特点之是支持无类别路由，路由更新发送携带子网掩码，所以本图中各个网段可以实现路由，也就是说，所有网络都是可以互通的。

答案：C

QUESTION NO: 66
The network with the IP address 172.31.0.0/19 is to be configured on the TestKing
router with the partial configuration shown in the graphic. Which of the following
statements describes the number of available subnets and hosts that will result from
this configuration?



TK公司的路由器配置了172.31.0.0/19地址。部分配置文件如下，关于可用子网和主机，那个说法正确？

A. There are 7 usable subnets, with 2046 usable host addresses.
B. There are 8 usable subnets, with 30 usable host addresses.
C. There are 7 usable subnets, with 30 usable host addresses.
D. There are 8 usable subnets, with 2046 usable host addresses.
E. There are 7 usable subnets, with 8190 usable host addresses.
F. There are 8 usable subnets, with 8190 usable host addresses.

解析：172.31.0.0/19，可见借用了3位，而配置文件中启用了ip subnet-zero 所以可用子网数目8个
可用主机数目为2的13次方－2＝8190

答案：F

赵高老师真强啊
对学习CCNA的朋友帮助非常大

有的题目能解释一下吗？

引用:

原帖由 边城小狗 于 2007-7-14 18:35 发表
有的题目能解释一下吗？

欢迎探讨，请指出你感兴趣的题目。

QUESTION NO: 67
A new subnet with 12 hosts in the TestKing network has been added. Which subnet
address should this network use to provide enough useable addresses while wasting
the fewest addresses?

TK公司加入了一个12个主机的子网，下列哪个子网地址可以提供足够用的主机地址并且浪费最少?



A. 192.168.10.80/29
B. 192.168.10.96/28
C. 192.168.10.80/28
D. 192.168.10.96/29

解析:既然是12个主机，主机位用4位便可，所以答案在B，C之间
但是注意到C的地址范围和192.168.10.67/27有冲突。

答案:B

QUESTION NO: 68
A company has the following addressing scheme requirements:
-uses a Class B IP address
-currently has 60 subnets
-has a maximum of 1000 computers on any network segment
-needs to leave the fewest unused addresses in each subnet
-uses RIP v1
Which subnet mask is appropriate to use in this network?

某公司的网络地址规划要求是
使用B类网址
大约60个子网
每个网段最多有1000个主机
每个子网需要预留少量之地
使用RIP v1作为路由协议
下列哪个子网掩码合适呢？

A. 255.255.252.0
B. 255.255.248.0
C. 255.255.255.0
D. 255.255.255.128
E. 255.255.255.248
F. 255.255.240.0

解析：B类地址默认掩码/16
60个子网 2的6次方＝64 刚好
1000个主机 2的10次方-2=1022 刚好

答案：A

第一部分 使用思科技术设计小型局域网(23题) 完成
第二部分 根据要求设计IP地址(68题) 完成

注：懒人一个，集中在一个WORD上，方便打印。
第一部分 使用思科技术设计小型局域网(23题)
第二部分 根据要求设计IP地址(68题)
如有什么地方不对，请赵老师指点。
如要转帖发表，请和赵老师联系。

Section 3: 根据需求选择正确的路由协议(18题)

QUESTION NO: 1
When designing OSPF networks; what is the purpose of using a hierarchical design?
(Select all choices that apply)

当设计OSPF网络的时候，使用分级设计的目的是什么？
A. To reduce the complexity of router configuration
B. To speed up convergence
C. To confine network instability to single areas of the network
D. To reduce routing overhead
E. To lower costs by replacing routers
F. To decrease latency

解析：OSPF可是层次化的路由算法，当网络分成不同的区域有许多好处，如
单个区域内部的路径变化仅仅影响本区域内的路由器运行SPF算法，不会波及到其他区域。
这种分而治之的做法既加快了网络的收敛，又能减少路由信息在网络上的传输量。
但是，这种面对大型网络的分区域管理也增加了网络的复杂性，有时候可能需要多加几个路由器才能完成分区域管理。

Answer: B, C, D

QUESTION NO: 2
The TestKing network is shown in the diagram below:
In this diagram, OSPF is used as the routing protocol between the corporate office
and the offices on the left side of the diagram. An ISDN link provides connectivity
from the central corporate router to the remote sales office on the right side of the
diagram. Which type of route should the corporate office use to reach the router on
the right side of the diagram if the overhead on the ISDN link is to be kept to a
minimum?

TK公司的网络拓扑如下



图中左面办公地点之间的网络使用了OSFP路由协议相连。
图中右面显示总公司和远程销售点的路由器之间采用了ISDN链路连接
那么如果想保证ISDN链路费用最低，总公司(corporate office)应该采用那种类型的路由方法去连接右面的路由
器？
A. A RIP route
B. An OSPF route
C. A static route
D. A default route
E. A dynamic route
F. None of the above

解析：ISDN是按需拨号的，一旦发现需要传输数据就会自动拨号而产生费用。
如果采用动态路由协议，发布路由更新时候产生数据包，ISDN链路就会启动。
如果采用RIP协议，那么总公司的路由器需要运行两种路由协议,还需要配置重发布。
最合适的方式是采用静态路由，这样不会有路由信息发送到ISDN链路。
选项中D缺省路由看起来也可以实现这一点，但是会影响去左上角ISP的数据流

答案：C

QUESTION NO: 3
You are a network administrator and you need to implement a routing protocol on
your network that provides:
* Scalability
* VLSM support
* Minimal overhead
* Support for connecting networks using routers of multiple vendors
Which of the following routing protocol would best serve your needs?

作为网管的你需要选择一个提供下列性能的路由协议？
可扩展性
支持VLSM
最小的网络流量
支持不同厂商设备的互联

A. VTP
B. RIP version 1
C. EIGRP
D. OSPF
E. IGRP
F. CDP

解析：支持不同厂商设备的互联说明要求一个国际标准的协议，所以IGRP和EIGRP不能选
RIP v1不支持VLSM

答案：D

第三个题差点没想通

QUESTION NO: 10
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?
将一个C类网络划分子网,希望可以得到尽可能多的可用主机地址,应该使用下列哪个方案?

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

解析:对于一个C类网址,可以划分的情况有:


不会吧？？？没用ip sub?

引用:

原帖由 rswzy 于 2007-7-17 03:21 发表
QUESTION NO: 10
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 ...

如果用了ip subnet-zero

借用位数 掩码 子网数 主机数目
2 /26 4 62
3 /27 8 30
4 /28 16 14
5 /29 32 6
6 /30 64 2

当然是/26的主机数量最多了。
TK有些题目都是没有启用0子网的。考试中会明确说明。