CCNA题库更新版(增加的93新题)
Exam A
QUESTION1
Which two commands correctly verify whether port security has been configured on port FastEthernet0/12 on a switch?(choose two)
A.SW1#show swithport port-security interface FastEthernet0/12
B.SW1#show swithport port-secure interface FastEthernet0/12
C.SW1#show port-secure interface FastEthernet0/12
D.SW1#show running-config
Answer:CD
Explanation/Reference:
QUESTION2
Which component of VPN technology ensures that data can be read only by its intended recipient?
A.data integrity
B.encryption
C.key exchange
D.authentication
Answer:D
Explanation/Reference:
哪个VPN组件可以确保数据只能让预定的人读取
QUESTION3
Explanation/Reference:
此条命令允许5条SSH虚链路
QUESTION4
Which IPV6routing protocol uses multicast group FF02::8to send updates?
A.RIPng
B.OSPFv3
C.IS-IS for IPv6
D.static
Answer:C
Explanation/Reference:
哪一个IPV6协议用组播地址FF02：：8发送更新
QUESTION5
Explanation/Reference:
从信息中可以看到协议为RIPv1，192.168.168.0in16hops，将要从路由表中清除
QUESTION6
The network administrator is asked to configure113point-to-point links.Which IP addressing scheme best defines the address range and subnet mask that meet the requirement and waste the fewest subnet and host addresses?
A.10.10.0.0/18subnetted with mask255.255.255.252
B.10.10.0.0/25subnetted with mask255.255.255.252
C.10.10.0.0/24subnetted with mask255.255.255.252
D.10.10.0.0/23subnetted with mask255.255.255.252
E.10.10.0.0/16subnetted with mask255.255.255.252
Answer:D
Explanation/Reference:
113个point-to-point链路而不是IP。每个链路需要2个有效的IP地址，即2个主机位。113个需要7位，一共需要9位，所以掩码为23
QUESTION7
VLAN3is not yet configured on your switch.What happens if you set the switchport access vlan3 commmand interface configuration mode?
A.The command is accepted and the respective VLAN is added to vlan dat.
B.
The command is rejected.
C.The command is accepted and you must configure the VLAN manually.
D.
The port turns amber.
Answer:A
Explanation/Reference:
在PT和真机环境下回自动创建vlan。切莫用路由器的IOS做此实验。
QUESTION8
Which parameter can be tuned to affect the selection of a static route as a backup.when a dynamic
protocol is also being used?
A.link bandwidth
B.hop count
C.link cost
D.administrative distance
E.link delay
Answer:D
Explanation/Reference:
选择路由先看管理距离，小的优先
QUESTION9
Explanation/Reference:
虚链路为点对点，R2为子接口，每条虚链路各自一个网段
QUESTION10
Why will a switch never learn a broadcast address?
A.Broadcast frames are never sent to swiches.
B.Broadcast addresses use an incorrect format for the switching table.
C.
A broadcast address will never be the source address of a frame.
D.Broadcasts only use network layer addressing.
E.A broadcast frame is never forwarded by a switch.
Answer:C
Explanation/Reference:
QUESTION11
Wich command can you use to manually assign a static IPV6address to a router interface?
A.ipv6address PREFIX_1::1/64
B.ipv6autoconfig2001:db8:2222:7272::72/64
C.ipv6autoconfig
D.ipv6address2001:db8:2222:7272::72/64
Answer:D
Explanation/Reference:
IPv6在路由器上设置地址的命令
QUESTION12
Explanation/Reference:
此处要求用一条命令宣告
QUESTION13
Which IPsec security protocol should be used when confidentiality is required?
A AH
B MB5
C PSK
D ESP
Answer:D
Explanation/Reference:
封装安全载荷协议Encapsulating Security Payload（ESP）
QUESTION14
What is the function of the command switchport trunk native vlan999on a？
A.It designates VLAN999for untagged traffic.
B.It blocks VLAN999traffic from passing on the trunk.
C.It creates a VLAN999interface.
D.It designates VLAN999as the default for all unkown tagged traffic.
Answer:D
Explanation/Reference:
设置vlan999为本征vlan，交换机默认本征vlan为vlan1.
QUESTION15
Which command can be used from a PC to verfy the connectivity between host that connect thro…(字体不清)…?
A.tracert address
B.ping address
C.arp address
D.traceroute address
Answer:A
Explanation/Reference:
traceroute是路由器的命令
QUESTION16
In which solution is a router ACL used?
A.protecting a server frome unauthorized acces
B.controlling path selection,based on the route metric
C.reducing router CPU utilization
D.filterring packets that are passing through a router
Answer:D
Explanation/Reference:
ACL应用在路由器，提供包过滤的功能
QUESTION17
Which statement is true,as relates to classful or classless routing?
A.RIPV1and OSPF are classless routing protocols.
B.Classful routing protocols send the subnet mask in routing updates.
C.Automatic summarization at classful boundaries can cause problems on disc……
D.EIGRP and OSPF are classful routing protocols and summarize routes by def……
Answer:C
Explanation/Reference:
自动汇总会将IP地址汇总为主类地址，必须手动关闭
QUESTION18
A router has two FastEthernet interfaces and needs to connect to four vlans in the local network.How can you accomplish this task,using the fewest physical interfaces and without decreasing network performance?
A.Add two more FastEthernet interfaces.
B.Add a second router to handle the vlan traffic.
https://www.wendangku.net/doc/535196213.html,e a hub to connect the four vlans with a FastEthernet interface on router.
D.
Implement a router-on-a-stick configuration.
Answer:D
Explanation/Reference:
设置一个单臂路由
QUESTION19
Explanation/Reference:
一个vlan就是一个广播域
QUESTION20
What is the effect of using the service password-encryption command?
A.nly passwords configured after the command has been entered will be encrypted.
B.
Only the enable password will be encrypted.
C.Only the enable secret password will be encrypted
D.It will encrypt the secret password and remove the enable secret password from the configuration.
E.It will encrypt all current and future passwords.
Answer:E
Explanation/Reference:
E.加密已经有的和未来的密码
QUESTION21
Explanation/Reference:
想要远程管理交换机需要在交换机上的配置，B正确QUESTION22
Explanation/Reference:
设置静态路由
QUESTION23
Explanation/Reference:
帧中继使用Inverse ARP将IP地址解析为DLCI号
QUESTION24
Explanation/Reference: QUESTION25
Explanation/Reference:
QUESTION26
How dose a DHCP server dynamically assign IP address to host?
A.Addresses are allocated after a negotiation between the server and the host to determine the
length of the agreement.
B.Addresses are assigned for a fixed period of time.At the end of period,a newquest for an address
must be made,and another address is then assigned.
C.Addresses are leased to host.A host will usually keep the same address by periodically contacting the
DHCP sever to renew the lease.
D.Addresses are permanently assigned so that the host uses the same address at all times.
Answer:C
Explanation/Reference:
QUESTION27
Which type of EIGRP route entry describes a feasible successor?
A.a primary route,stored in the routing table
B.a backup route,stored in the routing table
C.a backup route,stored in the topology table
D.a primary route,stored in the topology table
Answer:C
Explanation/Reference:
可行后继作为替补存在拓扑表中
QUESTION28
What is the purpose of the inverse ARP?
A.to map a known DLCI to an IP address
B.to map a known IP address to a MAC address
C.to map known SPID to a MACaddress
D.to map a known DLCI to a MAC address
E.to map a known IP address to a SPID.
F.to map a known MAC address to an IP address
Answer:A
Explanation/Reference:
反向ARP的作用，前面已经讲过
QUESTION29
What is the default maximum number of equal-cost paths that can be placed into the routing of a cisco OSPF router?
A.16
B.2
C.unlimited
D.4
Answer:D
Explanation/Reference:
OSPF默认等价均衡链路为4条
QUESTION30
Which IPV6routing protocol uses multicast group FF02::9to send updates?
A.RIPng
B.OSPFv3
C.static
D.IS-IS for IPv6
Answer:A
Explanation/Reference:
RIPng通过组播地址FF02：：9更新
QUESTION31
What are two benefits of using NAT?(choose two)
A.NAT protects network security because private networks are not advertised.
B.NAT accelerates the routing process because no modifications are made on the packets.
C.Dynamic NAT facilitates connections from the outside of the network.
D.NAT facilitates end-to-end communication when IPsec is enable.
E.NAT eliminates the need to re-address all host that require extemal access.
F.NAT conserves addresses through host MAC-level multiplexing.
Answer:AE
Explanation/Reference:
E.NAT消除了当需要外部链接时每个主机都需要一个不同IP地址
Which three statements about RSTP are true?(choose three)
A.RSTP significantly reduces topology reconverging time after a link failure.
B.RSTP expends the STP port roles by adding the alternate and backup roles.
C.RSTP port atates are blocking,discarding,learing,or forwarding.
D.RSTP also uses the STP proprsal-agreement sequence.
E.RSTP use the same timer-baseed process as STP on point-to-point links.
F.RSTP provides a faster transition to the forwarding state on point-to-point links than STP does. Answer:ABF
Explanation/Reference:A能够减少汇聚
时间B比STP增加了端口角色alternat和
backup
F在点到点链路提供比STP更快的传输和转发
QUESTION33
Answer:BC
Explanation/Reference:
A switch is configured as a vtp sever with a domain name of CCNA.Which cisco ios privileged mode command,followed by a reload of the swith,will reset the VTP management domain name of the switch to a NULL value?
A.#vtp domain unset
B.#delete
vlan.dat C.#no
vtp domain D.
#vtp domain null
Answer:B
Explanation/Reference:
删除VTP数据需要删掉vlan数据库并重启
QUESTION35
If an Ethernet port on a router was assigned an IP address of172.1.1.1/20,what is the maximum number of hosts allowed on this subnet?
A.4094
B.1024
C.8190
D.2046
E.4096
Answer:A
Explanation/Reference:
2的12次方减2
QUESTION36
Which two statements about static NAT translations are true?(choose two)
A.They are always present in the NAT table.
B.They allow connection to be initiated from the outside.
C.They can be configured with access lists,to allow two or more connections to be initiated from the
outside.
D.They require no inside or outside interface markings because addresses are statically defined. Answer:AB
Explanation/Reference:
静态NAT A出现在NAT表
中B允许来自外部的链接
QUESTION37
Which of these represents an IPv6link-local address?
A.FE08::280e:611:a:f14f:3d69
B.FE81::280f:512b:e14f:3d69
C.FE80::380e:611a:e14f:3d69
D.FEFE:0345:5f1b::e14d:3d69
Answer:C
Explanation/Reference:
IPv6本地地址FE80开头后面为本地mac地址
What are three features of the IPV6protocol?(choose three)
https://www.wendangku.net/doc/535196213.html,plicated header
B.
plug-and-play C.
no broadcasts D.
checksums
E.optional IPsec
F.autoconfiguration
Answer:BCF
Explanation/Reference:
B即插即用C
没广播地址
F自动设置
QUESTION39
Assuming default setting,how can you erase the VTP database of VLANs on a CISCO IOS switch running in VTP server mode?
A.Enable VTP pruning
B.From privileged mode,erase the startup configuration file,then reload.
C.From privileged mode,erase the vlan date file,then reload.
D.Cycle the switch power.
Answer:C
Explanation/Reference:
删除VTP数据需要删掉vlan数据库并重启
QUESTION40
Explanation/Reference:
路由汇总一定要汇总为最小的网段
QUESTION41 QUESTION42
Explanation/Reference:
远程管理交换机需要在交换机上设置default gateway和vlan IP
QUESTION43
What value is primarily used to determine which port becomes the root port on each nonroot switch in a spanning-tree topology?
A.lowest port MAC address
B.port priority number and MAC address.
C.VTP revision number
D.highest port priority number.
E.path cost
Answer:E
Explanation/Reference:
此处为选举跟端口。选举跟桥先看优先级
QUESTION44
Explanation/Reference:
router id如果没有手动设置，先选环回口最大ip地址，没有环回口选物理端口最大IP地址QUESTION45
Why do large OSPF networks use a hierarchical design?(choose three)
A.to confine network instability to single areas of the network.
B.to reduce the complexity of router configuration
C.to speed up convergence
D.to lower costs by replacing routers with distribution layer switches
E.to decrease latency by increasing bandwidth
F.to reduce routing overhead
Answer:ACF
Explanation/Reference:
QUESTION46
A network administrator receives an error message while tring to configure the Ethernet interface of a router with IP address10.24.24.24/29.which statement explains the reason for this issue?
A.The address is a broadcast address
B.The Ehernet interface is faulty
C.VLSM-capable routing protocols must be enable first on the router.
D.This address is a network address.
Answer:D
Explanation/Reference:
此地址为网络地址
QUESTION47
Which two are advantages of static routing when compared to dynamic routing?(choose two)
A.Security increases because only the network administrator may change the routing tables.
B.Configuration complexity decreases as network size increases.
C.Routing updates are automatically sent to neighbors.
D.Route summarization iscompued automatically by the router.
E.Routing traffic load is reduced when used in stub network links
F.An efficient algorithm is used to build routing tables,using automatic updates.
G.Routing tables adapt automatically to topology changes.
Answer:AE
Explanation/Reference:
静态路由相比动态路由的好处
QUESTION48
A company has a small network,consisting of a single switch and a single router.The switch has been configured with two vlans,and route-on-a-stick is being configured on the router for inter-vlan routing.A trunk is configured to connect the switch to the router.What is the minimum number of router subinterfaces that are required for all the vlans to communicate?
A.one
B.
three C.
two D.
zero
Answer:C
Explanation/Reference:
单臂路由一个vlan需要一个子接口
QUESTION49
Which command can be a router to verify the layer3path to a host?
A.traceroute address
B.tracert address
C.ssh address
D.telnet address
Answer:A
Explanation/Reference:
tracert是windows的命令
QUESTION50
interface-dlc c i command configure?
Which dose the frame-relay interface-dl
A.remote DLCI on the main interface
B.local DLCI on the main interface
C.local DLCI on the subinterface
D.remote DLCI on the subinterface
Answer:C
Explanation/Reference:
只有子接口使用此命令
QUESTION51
A.10
B.40
C.30
D.20
Answer:A
Explanation/Reference:
OSPF发送hello包默认10s
QUESTION52
Explanation/Reference:
与外网通信先送网关
QUESTION53
Which commands is necessary to permit SSH or Telnet access to a cisco switch that is otherwise configured for these vty line protocols?
A.transport type all
B.transport output all
C.transport preferred all
D.transport input all
Answer:D
Explanation/Reference:
D.define all protocols to use when to connecting to terminal server
QUESTION54
Which command shows your active Telnet connections?
A.show session
B.show cdp neighbors
C.show users