CCNA第二学期6[材料]_ccna第二学期final

CCNA第二学期6[材料]由刀豆文库小编整理，希望给你工作、学习、生活带来方便，猜你可能喜欢“ccna第二学期final”。

1、CIDR对网络有哪两项好处？（选择两项。）14

What two advantages does CIDR provide to a network?(Choose two.)缩小路由表大小 reduced routing table size 动态地址分配 dynamic addre aignment 自动路由重分布 automatic route redistribution 减少路由更新流量 reduced routing update traffic 在有类边界自动总结 automatic summarization at claful boundaries 2

请参见图示。网络管理员打算为两台路由器之间的点对点连接创建一个子网。哪个子网掩码可以为该点对点链路提供足够的地址，同时浪费的地址数最少？5 Refer to the exhibit.The network administrator wants to create a subnet for the point-to-point connection between the two routers.Which subnetwork mask would provide enough addrees for the point-to-point link with the least number of wasted addrees?

255.255.255.192

255.255.255.224

255.255.255.240

255.255.255.248

255.255.255.252 3

请参见图示。网络工程师正在总结如图所示路由器，R1上的两组路由。以下哪项可总结所有子网？

3Refer to the exhibit.A network engineer is summarizing the two groups of routes on router R1 shown in the exhibit.Which summarization will work for all the subnets? 192.168.0.0/23

192.168.0.0/23

192.168.0.0/22

192.168.0.0/21

192.168.0.0/20

4、下列哪些项包含在无类路由协议的路由更新中？（选择两项。）13

Which of the following are contained in the routing updates of clale routing protocols? 32位地址 32-bit addre

下一跳路由器接口 next hop router interface

子网掩码

单播主机地址 unicast host addre

第 2层地址

5、VLSM可帮助缓解下列哪个问题？ 1 Which of the following problems does VLSM help to alleviate? IP地址短缺 the shortage of IP addrees 为大型企业中的主机分配静态 IP地址的麻烦 the difficulty of aigning static IP addrees to hosts in large enterprises 实施高级路由协议（如 OSPF和 EIGRP）的复杂程度

the complexity of implementing advanced routing protocols such as OSPF and EIGRP 缺少精通 RIP v1和 IGRP的网络管理员

the shortage of network administrators qualified in the use of RIP v1 and IGRP6、网络管理员可在 VLSM的帮助下实现下列哪一项？ 2 What does VLSM allow a network administrator to do? 在一个自治系统中使用一个子网掩码

utilize one subnet mask throughout an autonomous system 在相同的 IP地址空间中使用多个子网掩码

utilize multiple subnet masks in the same IP addre space 在整个自治系统中使用 IGRP作为路由协议

utilize IGRP as the routing protocol in an entire autonomous system 在自治系统中使用多种路由协议

utilize multiple routing protocols within an autonomous system 7

请参见图示。如果路由器，A向路由器 B发送网络 172.16.1.0的 RIPv1更新，该网络将使用什么子网掩码？Refer to the exhibit.What subnet mask will be applied by router B when it receives a RIPv1 update for the network 172.16.1.0? 无 8

请参见图示。网络管理员希望尽量减少，Router1路由表中的条目数量。管理员应该在该网络上使用什么技术？Refer to the exhibit.The network administrator wants to minimize the number of entries in Router1’s routing table.What should the administrator implement on the network? VLSM

CIDR

私有 IP地址 有类路由

9、某路由器的路由表中安装了一条到网络 192.168.32.0/20的总结路由。该路由总结了哪些网络？

A router has a summary route to network 192.168.32.0/20 installed in its routing table.What range of networks are summarized by this route? 192.168.0.0 – 192.168.32.0/24

192.168.0.0 – 192.168.47.0/24

192.168.32.0 – 192.168.47.0/24

192.168.32.0 – 192.168.48.0/24

192.168.32.0 – 192.168.63.0/24

10、网络管理员的任务是为 QA、销售和行政部门分割一个 C类网络。QA部门由 10人组成，销售部门有 28人，行政部门有 6人。以下哪两个子网掩码能够为 QA和销售部门提供足够的地址？（选择两项。）

A network administrator is tasked with dividing up a cla C network among the QA, Sales, and Administration departments.The QA department is made up of 10 people, the Sales is made up of 28 people, and the Administration has 6.Which two subnets masks adequately addre the QA and Sales departments?(Choose two.)23 255.255.255.252，用于 QA部门

255.255.255.224，用于销售部门

255,255,255,240，用于 QA部门

255,255,255,248，用于 QA部门

255.255.255.0，用于销售部门

在如图所示的网络中，从C类地址的主机部分借用了3个位。在这三条点对点链路上，如果不使用VLSM，那么共有多少个有效主机地址没有被使用？5

In the network shown in the graphic, three bits were borrowed from the host portion of a Cla C addre.How many valid host addrees will be unused on the three point-to-point links combined if VLSM is not used? 3

180 12

如图所示的网络被分配了一个C类地址。使用VLSM时，如果要提供路由器A所需的主机地址数，同时又尽量避免浪费地址，那么应使用哪一掩码？5

A Cla C addre has been aigned for use in the network shown in the graphic.Using VLSM, which bit mask should be used to provide for the number of host addrees required on Router A, while wasting the fewest addrees? /31

/30

/29

/28

/27

/26 13

如图所示，Router1和Router2之间新添加的以太网链路需要一个额外的子网。要为此链路提供最多14个可用地址同时又尽量避免浪费地址，应该在该网络上配置哪个子网地址？5

An additional subnet is required for a new Ethernet link between Router1 and Router2 as shown in the diagram.Which of the following subnet addrees can be configured in this network to provide a maximum of 14 useable addrees for this link while wasting the fewest addrees? 192.1.1.16/26

192.1.1.96/28

192.1.1.160/28

192.1.1.196/27

192.1.1.224/28

192.1.1.240/28

14、哪三种内部路由协议支持VLSM？（选择三项。）13

4Which three interior routing protocols support VLSM? OSPF

RIP v1

RIP v2

EIGRP

BGP

STP 15

请参见图示。图中已列出网络中每个子网所需的主机地址数量。该数量包含该子网上所有路由器端口和主机所需的主机地址。确定所有设备和路由器端口地址分配方案之后，可用主机地址中总共有多少地址未被用到？3 Refer to the exhibit.The number of required host addrees for each subnet in a network is listed in the exhibit.This number includes the host addre requirements for all router ports and hosts on that subnet.After all device and router port addre aignments are determined, what will be the total number of unused host addrees available? 6

16

请参见图示。在如图所示的网络中，路由器接口占用了每个子网的第一个地址。下列哪个IP地址可供该网络中某个LAN上的主机使用？4

Refer to the exhibit.In the network that is shown, the router interfaces are aigned the first addre in each subnet.Which IP addre would be usable for a host on one of the LANs in this network? 192.168.1.5/30

192.168.2.17/28

192.168.2.63/27

192.168.2.130/25 17

请参见图示。下列哪个地址是图中某个子网的广播地址？2 Refer to the exhibit.Which addre is a broadcast addre for one of the subnets that are shown in the exhibit? 192.168.4.3/29

192.168.4.15/29

192.168.4.65/26

192.168.4.255/24 18

请参见图示。网络管理员需要根据10.0.0.0/8为运行RIPv2的路由器创建两个子网。Admin子网需要120台主机，Sales子网需要58台主机。网络管理员将10.0.1.128/25分配给Admin子网。Sales子网分配了10.0.1.192/26。该编址方案将导致什么结果？3

Refer to the exhibit.A network administrator needs to create two subnetworks from 10.0.0.0/8 for a router running RIPv2.The Admin subnet requires 120 hosts and the Sales subnet requires 58 hosts.The network administrator aigned 10.0.1.128/25 to the Admin subnet.The Sales subnet is given 10.0.1.192/26.What will be the result of this addreing scheme? 因为RIPv2不支持VLSM，所以不允许使用这样的子网掩码。

Because RIPv2 does not support VLSM, the subnet masks will not be allowed.子网将无法为给定的网络需求提供足够的主机地址。

The subnets will not have enough host addrees for the given network requirements.子网发生重叠，将被路由器拒绝。

The subnets overlap and will be rejected by the router.路由器支持此编址方案。

The router will support the addreing scheme.19

请参见图示。一位网络技术人员在R1中输入到达10.1.1.0/24网络所需的静态路由。从R1 ping主机B失败。该技术人员开始测试网络，并得出以下结果：

Refer to the exhibit.A network technician enters the static route in R1 needed to reach network 10.1.1.0/24.A ping from R1 to Host B fails.The technician begins testing the network and has the following results: 1.从R1 ping R2上的S0/0/0接口....成功 2.从R1 ping R2上的Fa0/0接口....成功

3.从主机B ping 10.1.1.0/24网络上的主机....成功 4.从主机B ping R2上的Fa0/0接口....成功 5.从R2 ping主机B....成功

导致从R1 ping主机B失败的原因可能是什么？

What is the likely cause of the failure of the ping from R1 to Host B? 主机B的以太网网卡有问题。Host B has a defective Ethernet card.主机B上的默认网关设置不正确。The default gateway on Host B is not correctly set.R2和主机B之间存在第2层故障。There is a Layer 2 problem between R2 and Host B.R2没有返回至R1所连接网络的路由。R2 does not have routes back to networks connected to R1.20、什么是超网？4 What is a supernet? 默认路由的网络

the network for a default route 同时包含私有地址和公有地址的网络

a network that contains both private and public addrees 由ISP控制的一组不连续网络

a set of discontiguous networks that are controlled by an ISP 将多个IP有类网络合并到一个IP地址范围的总结网络

a summarization of serveral IP claful networks into one IP addre range