思科CCNA新版第3学期final-期末考试答案
cisco第三学期final_stu
1请参见图示。
网络公司设计师正在审查客户网络图。
图中所示的拓扑存在哪两项风险或问题？（选择两项。
）12防火墙路由器和ISP 之间的连接存在单一故障点。
如果用于将Cisco Call Manager 连接到网络的交换机发生故障，将导致整个IP 电话系统发生故障。
使用第 3 层交换机将数据中心服务器与IP 电话机相连会导致延时过大。
需要采用冗余方式将IP 电话机连接到交换机，以防止接入层形成故障点。
如果一台第 3 层交换机发生故障，Cisco Call Manager 将不可达。
2网络工程师正在客户现场。
解决网络中的技术问题后，工程师为支持人员提供培训课程。
以下哪项工作职能与此类网络工程师的活动最相符？4网络设计师客户经理售前工程师售后现场工程师3下列哪个值是IPv6 地址2001:DB80:0000:0000:0C41:3EFF:FE00:0000 的另一种表达方式？32001:DB8::C41:3EFF:FE:2001:DB80::C41:3EFF:FE00::2001:DB80::C41:3EFF:FE00:02001:DB80:0:0:0:C41:3EFF:FE::4请参见图示。
SW11 上已启用的所有接口的生成树角色是什么？3 备用备份指定根5某公司的帮助台员工不太熟悉VPN。
为了使帮助台能够支持远程工作人员进行安全的远程访问，网络设计师必须将以下哪两项功能或技术定为培训内容？（选择两项）35QoS 工作原理VLAN 配置隧道协议IPv6 和IPv4 双协议栈加密算法帧中继配置6可在无线网络中广播什么信息来帮助用户连接网络并使用无线服务？1SSIDWEP 密钥VLAN 参数WPA 加密密钥VPN 身份验证信息7需要将一个配置文件从TFTP 服务器加载到路由器的RAM 中。
管理员在完成此任务前应该了解什么信息？2 路由器的IP 地址和TFTP 服务器所用的操作系统TFTP 服务器的IP 地址服务器上的配置文件的名称路由器的IP 地址和NVRAM 中路由器配置文件的名称TFTP 服务器的IP 地址和路由器上的配置寄存器的值8配置帧中继时，是什么标识WAN 交换机的虚电路？4LMICPEPVCDLCI9在实施安全策略时，安全检查列表中应当包括下列哪两项操作？（选择两项）45禁用所有日志。
思科 期末考试答案
关闭窗口考试系统考试浏览器 - ENetwork Final Exam - CCNA Exploration: Network Fundamentals (版本下面是考试的考试试题以及与题目关联的评分规则。
思科网络技术学院的内容是受到版权保护的,禁止一切未经授权的张贴,分发或共享本考试的内容.1下列哪一个 OSI 层负责管理数据段？应用层表示层会话层传输层2请参见图示。
图中所示为客户端之间发送电子邮件的过程。
以下哪一列表正确地标识了图中各编号阶段使用的组件或协议？3第 4 层报头包含帮助数据传输的哪一类信息？服务端口号主机逻辑地址设备物理地址虚拟连接标识符4哪个 OSI 层提供面向连接的可靠数据通信服务？应用层表示层会话层传输层网络层5当 OSI 模型下层执行无连接协议时，通常使用什么来确认数据已收到并请求重传丢失的数据？IPUDP以太网无连接确认面向连接的上层协议或服务6下列哪三项是 CSMA/CD 的特征？（选择三项。
）设备会侦听介质，并且仅当无法检测到介质上存在其它信号时才会传输数据。
介质上的所有设备均可侦听所有通信。
设备根据配置的优先级来进行通信。
发生冲突后，引起冲突的设备会优先尝试传输数据。
发生冲突时，所有设备会在一段时间内停止传输数据，该段时间的长度随机决定。
CSMA/CD 使用令牌系统来避免冲突。
7在封装过程中，传输层添加什么标识符？源 IP 地址和目的 IP 地址源 MAC 地址和目的 MAC 地址源端口号和目的端口号源通道标识符和目的通道标识符8数据链路层有哪两项功能？（选择两项）分割和记录数据。
在源主机和目的主机上运行的程序之间进行数据交换。
控制数据如何传递到介质中。
生成信号以表示每个帧中的比特。
使用帧头和帧尾封装每个数据包，以便在本地介质中进行传输。
9请参见图示。
网络中的主机 A 和 B 正在传输层交换数据段。
下列关于此交换的陈述，哪两项是正确的？（选择两项）主机 A 正在使用 FTP 向主机 B 传输文件。
思科CCNA新版第3学期final-期末考试答案
思科CCNA新版第3学期final-期末考试答案1出于维护目的，已将路由器从网络中移除。
并已将新的 Cisco IOS 软件映 像成功下载到服务器并复制到路由器的闪存中。
应该在进行什么操作后再 将路由器放回网络中运行？备份新的映像。
将运行配置复制到 NVRAM 。
从闪存中删除之前版本的 Cisco IOS 软件。
重新启动路由器并检验新的映像是否成功启动。
答案 说明最高分值correctness of response Option 422请参见图示。
管理员尝试在路由器上配置 IPv6 的 EIGRP ，但收到如图所示 的错误消息。
配置 IPv6 的 EIGRP 之前，管理员必须发出什么命令？no shutdowneigrp router-id 100.100.100.100ipv6 unicast-routingipv6 eigrp 100ipv6 cef答案 说明 最高分值correctness of response Option 323IPv6 EIGRP 路由器使用哪个地址作为 hello 消息的来源？32 位路由器ID接口上配置的 IPv6 全局单播地址所有 EIGRP 路由器组播地址接口 IPv6 本地链路地址答案 说明 最高分值correctness of response Option 424下列关于 EIGRP 确认数据包的说法，哪两项是正确的？（请选择两项。
）发送该数据包是为了响应 hello 数据包。
该数据包用于发现接口上连接的邻居。
该数据包作为单播发送。
该数据包需要确认。
该数据包不可靠。
答案 说明 最高分值correctness of response Option 3 and Option 5 are correct.25何时发送 EIGRP 更新数据包？仅在必要时当获取的路由过期时每 5 秒通过组播发送每 30 秒通过广播发送答案 说明 最高分值correctness of response Option 126请参见图示。
思科ccna第3学期_final_第1套_V_4
What is the purpose of VLAN trunking?It improves network performance by reducing broadcast traffic.It selects the best path to transmit data in a switched network.It carries the traffic of multiple VLANs through a single link.It avoids spanning tree loops in a switched network.Refer to the exhibit. Both switches are configured with default bridge priority. Which port will act as the STP root port if all links are oper Fa0/1 interface of S1Fa0/2 interface of S1Fa0/1 interface of S2Fa0/2 interface of S2Refer to the exhibit. The network administrator wants to configure Switch1 to allow SSH connections and prohibit Telnet conne ctions. How sh administrator change the displayed configuration to satisfy the requirement?Use SSH version 1.Reconfigure the RSA key.Configure SSH on a different line.Modify the transport input command.Refer to the exhibit. Which two facts about STP can be determined from the displayed output? (Choose two.)Switch S1 has the lowest configured STP priority in the network.Switch S1 is configured as the root bridge for VLAN1.Fa0/21 is the root port of switch S1.Fa0/22 is the redundant link.Fa0/24 is considered the best path to the root bridge.Which statement correctly describes the spanning-tree path cost?It is calculated based on the total number of switches connected in a loop.It is calculated based on the utilization of all the switches along a given path.It is calculated based on the bridge priority of the switches along a given path.It is calculated based on the sum of the port cost value, determined by link speed, for each switch port along a given path What are two requirements for configuring inter-VLAN routing using the router-on-a-stick model? (Choose two.)Each subinterface should be configured with its own IP address, subnet mask, and unique VLAN assignment.The physical interface of the router must be connected to a trunk link on the adjacent switch.The number of physical interfaces on the router should match the number of VLANs.Different static VLANs should be assigned to different interfaces of the router.The router should be configured as the VTP serverRefer to the exhibit. Which two options correctly describe the router configuration that is shown? (Choose two.)Routing between the 192.168.1.0 and 192.168.3.0 networks will not succeed until a routing protocol is configured on the route r.VLANs have not been appropriately configured on the router subinterfaces.The configuration is appropriate for a router-on-a-stick network design.Trunking has been appropriately configured on the router subinterfaces.An IP address should be applied to interface Fa0/1 for routing to occurRefer to the exhibit. What is true of the configuration of switch S1?A Cisco proprietary protocol is in use for ports Fa0/1 and Fa0/3.Switch ports Fa0/1 and Fa0/3 have been configured with the switchport mode access command.Untagged frames received on ports Fa0/1 and Fa0/3 will be placed on VLAN 1.Switch ports Fa0/1 and Fa0/3 are configured to carry data from multiple VLANs.Refer to the exhibit. Switches S2 and S3 are properly connected using an ethernet cable. A network administrator has configured both s is unable to propagate VLANs to S2. What could be the reason for this?The VTP configuration revision is different on both switches.The VTP domains are different on both switches.VTP pruning is disabled.VTP v2 is disabled.Refer to the exhibit. Router R1 is properly configured for router on a stick inter-VLAN routing, but PC1 is unable to ping PC2. What needs problem?Rename VLAN1.Connect one more port of S1 to R1.Configure the Fa0/1 port of S1 as a trunk port.Move the Fa0/0 interface of R1 to another VLAN.Refer to the exhibit. Router R-West and switch S-West1 are connected via a single ethernet cable between the router interface fa0/0 an fa0/1. The router and switch have been configured with the commands that are displayed in the exhib it. The network administrator ente trunk command and receives the output as shown. What is the cause of the "not-trunking" status for switch port Fa0/1?The trunk is established, but no VLANs have been configured to use it.The router is missing the dynamic trunking protocol statements necessary to form a trunk.Because the router does not support Dynamic Trunking Protocol, the trunk has not been established.The router, the switch, or both must be configured with the dynamic desirable option for Dynamic Trunking Protocol to establish aRefer to the exhibit. All trunk links are operational and all VLANs are allowed on all trunk links. An ARP request is sent by computer 5. W receive this message?only computer 4computer 3 and RTR-Acomputer 4 and RTR-Acomputer 1, computer 2, computer 4, and RTR-Acomputer 1, computer 2, computer 3, computer 4, and RTR-Aall of the computers and the routerRefer to the exhibit. A network administrator enters the displayed commands to configure VLAN 30. What is the result of running these commVLAN 30 will be added to S1, S2, and S3, but not to S4.VLAN 30 will be pruned from the VLAN database of S3.VLAN 30 will be added to the VLAN database of S3 but will not be propagated to S4, S2 or S1.VLAN 30 will not be added to the VLAN database of S3 and an error message will be displayedRefer to the exhibit. VTP pruning is enabled in the VTP domain that is shown. How will switch ST-1 handle Layer 2 broadcast traf host A on switch ST-C?It will be dropped.It will be forwarded out port Fa0/5 only.It will be forwarded out ports Fa0/5 and Fa0/10.It will be forwarded out ports Fa0/5, Fa0/10, and Fa0/15Refer to the exhibit. The devices in the network are operational and configured as indicated in the exhibit. However, hosts A and D other. What is the most likely cause of this problem?The link between the switches is up but not trunked.The Fa0/11 interface of Switch1 is not configured as a trunk.Hosts A and D are configured with IP addresses from different subnets.VLAN 20 and VLAN 30 are not allowed on the trunk between the switches.After unpacking a new Linksys WRT300N wireless multifunction device, a user needs to change the default administrator passwor d and make other configuration changes. What must the user do to access the device in order to make these changes?Use a wireless client to associate with the WRT300N and then open a HyperTerminal session with the device.Establish a wired connection with the device and then reboot the attached computer to launch the configuration software.Establish a wired connection from a computer in the same IP subnet as the WRT300N and enter the default IP address of the device into a web browser on the computer.Modify the TCP/IP properties of the computer that is connected to the WRT300N so that the computer and the WRT300N exist on the same network. Then reboot the computer to establish a connection.Refer to the exhibit. How is port Gi1/1 on SWT-A functioning in the spanning-tree topology?It is sending and receiving data frames.It is receiving BPDUs, but not sending data frames.It is participating in the election process by forwarding the BPDUs it receives.It is receiving BPDUs and populating the MAC address table, but not sending data.Refer to the exhibit. The switches have been configured as shown. The hosts that are connected to switch 101-2FL are not able to communicate with the hosts in their corresponding VLANs that are connected to switch 101-3FL. What should be done to fix the problem?Configure port Fa0/2 on switch 101-3FL as a static trunk link.Introduce a Layer 3 device or a switch with Layer 3 capability into the topology.Utilize the switchport trunk allowed vlan all command on switch 101-3FL to permit the VLAN traffic.Apply IP addresses that are in the same subnet to the interfaces that are used to connect switches 101-2FL and 101-3FLAfter listening for the presence of a signal on the network media, hosts A and C transmit data at the same time. In what two ways do the hosts respond to this situation? (Choose two.)The hosts transmit a jam signal to ensure that all hosts on the network are aware that a collision has occured.Because they are operating in full-duplex mode, the hosts resume listening for traffic in preparation for sending future messages.Because the hub will temporarily block traffic from one of the hosts, that host will be allowed to transmit once the wire is clear.Hosts A and C are assigned shorter backoff values to provide them priority to access the media for retransmission.After the backoff period of a host, the host checks to determine if the line is idle before retransmittingRefer to the exhibit. Hosts PC_A and PC_B send traffic simultaneously, and the frames from the transmitting stations collide.What is the last device to receive the collision?hub HB1switch SW1router R1switch SW2router R2switch SW4Refer to the exhibit. Switch SW2 has been newly purchased and added to the network. What configuration should be applied to SW2 so thatit participates in the same VTP domain as switch SW1, receives VLAN information from SW1, and synchronizes VLAN information?Disable VTP pruning on SW2.Configure SW2 in VTP transparent mode.Configure SW2 with the VTP domain password.Configure SW2 as a VTP server with a higher revision numberWhen configuring a router to act as an SSH server, what should be configured before issuing the crypto key generate rsacommand?the security domain namethe VTP domain namethe IP domain namethe host nameRefer to the exhibit. The switch VTY lines have been properly configured, but PC1 is unable to remotely manage the switch. How can this problem be resolved?Configure the Fa0/1 interface of the switch in trunk mode.Configure a default gateway on the switch.Configure the native VLAN on the switch.Configure the Fa0/1 interface of the switch to allow all VLANsRefer to the exhibit. A network administrator has segmented the network into two VLANs. The connected hosts can only access r esources in their own VLAN. What is the most scalable and cost effective solution to allow inter-VLAN communication in this network?Replace S1 with a router that has one FastEthernet interface for each PC.Add a second switch and divide the PCs so that each VLAN is connected to its own switch.Configure a router with two subinterfaces on one of its FastEthernet ports and connect it to S1 using a trunk link.Connect a router to a port on S1 and assign the IP address of VLAN1 to the connecting router interfaceRefer to the exhibit. An administrator documented the output of a CAM table from an Ethernet switch as shown. What action will the switch take when it receives the frame shown at the bottom of the exhibit?discard the frameforward the frame out port 2forward the frame out port 3forward the frame out all portsforward the frame out all ports except port 3add station 00-00-3D-1F-11-05 to port 2 in the forwarding tableWhich statement regarding the service password-encryption command is true?The service password-encryption command is entered at the privileged EXEC mode prompt.The service password-encryption command encrypts only passwords for the console and VTY ports.The service password-encryption command encrypts all previously unencrypted passwords in the running configuration.To see the passwords encrypted by the service password-encryption command, enter the no servicepassword-encryption commandWhich statement correctly describes the function of a Layer 2 switch?It performs switching and filtering based on the destination network layer address.It automatically uses STP to prevent switching loops in redundant topologies.It uses VTP to allow data from multiple VLANs to travel across a single link.It routes packets between different LAN segmentsWhich three statements are correct concerning the default configuration of a new switch? (Choose three.)It is configured in VTP server mode.STP is automatically enabled.The first VTY line is automatically configured to allow remote connections.VLAN1 is configured with a management IP address.All switch ports are assigned to VLAN1.The enable password is configured as ciscoRefer to the exhibit. How will switch S2 manage traffic coming from host PC1?S2 will drop the traffic, unless it is management traffic.S2 will tag the frame with VLAN ID 99 when it forwards it over the trunk link.S2 will leave the traffic untagged when it forwards it over a trunk link.S2 will tag the traffic with the highest VLAN ID value when it forwards it over the trunk link.Refer to the exhibit. The network administrator needs to remove the east-hosts VLAN and use the switch port from that VLAN in one of the existing VLANs. Which two sets of commands should be used when completely removing VLAN 2 from S1-Central while leaving the switch and all its interfaces operational? (Choose two.)S1-Central>enableS1-Central# reloadS1-Central>enableS1-Central# erase flash:S1-Central>enableS1-Central# delete flash:vlan.datS1-Central>enableS1-Central# configure terminalS1-Central(config)# no vlan 2S1-Central>enableS1-Central# configure terminalS1-Central(config-if)# interface fastethernet 0/1 S1-Central(config-if)# switchport access vlan 3Refer to the exhibit. The network administrator configures both switches as displayed. However, host C is unable to ping host D and host E is unable to ping host F. What action should the administrator take to enable this communication?Include a router in the topology.Associate hosts A and B with VLAN 10 instead of VLAN 1.Remove the native VLAN from the trunk.Configure one trunk port in the dynamic desirable mode.Add the switchport nonegotiate command to the configuration of S2Which two statements are correct about wireless infrastructure components? (Choose two.)An AP converts the TCP/IP data packets from their 802.11 frame encapsulation format to the 802.3 Ethernetframe format on the wired Ethernet network.A wireless AP does not require any physical connection to allow wireless clients to access the Internet.An AP is a layer 2 device, similar to a switch, that provides dedicated bandwidth to each connected wireless host.Collisions do not occur between wireless NICs and APs.The wireless router performs the roles of AP and router.Refer to the exhibit. The switches are configured for VTP as shown. Which two statements correctly describe the operation of these switches? (Choose two.)A new VLAN can be added to Switch1 and that information will be added only to Switch2.A new VLAN can be added to Switch1 and that information will be added to Switch2 and Switch4.An existing VLAN can be deleted from Switch4 and that VLAN will be deleted from Switch1 and Switch2.An existing VLAN can be deleted from Switch2 and that VLAN will be deleted from Switch1 and Switch4.A new VLAN can be added to Switch4 and that information will be added to Switch1, Switch2, and Switch3.A new VLAN can be added to Switch3 and that information will be added to Switch1, Switch2, and Switch4A new switch is to be added to an exis ting network in a remote office. The network administrator does not wantthe technicians in the remote office to be able to add new VLANs to the switch, but the switch should receive VLAN updates from the VTP domain. Which two steps must be performed to configure VTP on the new switch to meet these conditions? (Choose two.)Configure an IP address on the new switch.Configure the existing VTP domain name on the new switch.Configure all ports of both switches to access mode.Configure the new switch as a VTP client.Enable VTP pruningWhich two statements describe Spanning Tree Protocol? (Choose two.)It is only used at Layer 2.It is configured on routers.It eliminates Layer 2 loops in network topologies.It limits the number of valid MAC addresses allowed on a port.It allows VLAN information to propagate to other switches in the network.Refer to the exhibit. Which switch will be elected as the root bridge of the spanning tree topology?Cat-ACat-BCat-CCat-DRefer to the exhibit. What three statements describe why Host1 and Host2 are unable to communicate? (Choose three.)The switch ports are on different VLANs.The switch IP address is on the wrong subnet.The hosts are configured on different logical networks.A router is required to forward traffic between Host1 and Host2.The VLAN port assignments must be contiguous for each VLAN.The host default gateway addresses must be on the same logical network.Refer to the exhibit. A new host needs to be connected to VLAN 3. Which IP address should be assigned to this new host?192.168.1.22 /28192.168.1.31 /28192.168.1.32 /28192.168.1.52 /28192.168.1.63 /28Refer to the exhibit. Router RA receives a packet with a source address of 192.168.1.65 and a destination address of 192.168.1.161. What will the router do with this packet?The router will drop the packet.The router will forward the packet out interface FastEthernet 0/1.1.The router will forward the packet out interface FastEthernet 0/1.2.The router will forward the packet out interface FastEthernet 0/1.3.The router will forward the packet out interface FastEthernet 0/1.2 and interface FastEthernet 0/1.3Refer to the exhibit. On which of the devices in this network should routing between VLANs take place?the core layer devicesthe access layer devicesthe distribution layer devicesthe core and distribution layer devicesRefer to the exhibit. The teacher host is connected to port Fa0/7 on switch STW. A student has decided to share access to the Internet by attaching a hub and laptop to STW as shown. What will be the result of the student making this connection?The Fa0/7 port of STW will be shutdown.The student will gain full access to the Internet.Both the teacher and student will be able to receive data but only the teacher will be able to send.The frames from the laptop will be dropped, but the teacher host will maintain connectivity with the network.Refer to the exhibit. In what two ways will the router handle VLAN traffic that is received on the trunk? (Choose two.)Traffic to VLAN 1 received by the router interface Fa0/0 will be dropped by the router.Because interface Fa0/0 requires an IP address, the router will not be able to route between the VLANs.Packets that are received from network 192.168.20.0 /24 will be handled by subinterface Fa0/0.20.The router will use subinterface MAC addresses to identify the VLAN traffic that is received on the physical interface.The router will continue to process traffic from the attached VLANs even if the physical interface goes downRefer to the exhibit. Switch SW-A is to be used as a temporary replacement for another switch in the VTP Studentdomain. What two pieces of information are indicated from the exhibited output? (Choose two.)The other switches in the domain can be running either VTP version 1 or 2.There is a risk that the switch may cause incorrect VLAN information to be sent through the domain.VTP will block frame forwarding on at least one redundant trunk port that is configured on this switch.VLAN configuration changes made on this switch will be sent to other devices in the VTP domain.This switch will update its VLAN configuration when VLAN changes are made on a VTP server in the same domainWhat are three benefits of employing a hierarchical network design? (Choose three.)Hierarchically designed networks can more easily be expanded to suit future needs.Hierarchical design models enhance existing bandwidth through the use of link aggregation.The hierarchical model allows for specialized functionality at each layer, simplifying devicemanagement.Use of a hierarchical design allows replacement of redundant devices with high-capacity network equipment.A hierarchical design uses firewalls instead of complicated port-based and distribution layer securitypolicies.The hierarchical model allows the use of high-performance switches at all design layers, thus allowing for a fully-meshed topologyRefer to the exhibit. Hosts A and B attempt to transmit a frame at the same time and a collision occurs. When will host D be able to transmit?immediatelyafter sending its jam signalafter host A and host B have completed transmissionafter the jam signal clears and its backoff delay expiresWhat provides an authentication mechanism for 802.11-based wireless networks?DSSSOFDMSSIDWPARefer to the exhibit. What is the effect of setting the security mode to WEP on the Linksys integrated router?WEP identifies the wireless LAN.WEP allows the access point to inform clients of its presence.WEP translates IP addresses into easy-to-remember domain names.WEP encrypts data between the wireless client and the access point.WEP ensures that only authenticated users are allowed access to the WLAN.WEP translates an internal address or group of addresses into an outside, public address.Refer to the exhibit. SW-T has been configured with a single trunking interface. Which VLANs will be allowed across the trunk?Only VLAN 1 will be allowed across the trunk.All configured VLANs will be allowed across the trunk.Only the native VLAN will be allowed across the trunk.Only the the management and native VLANs will be allowed across the trunk.Only VLANs that are configured on the VTP server in the dom ain will be allowed across the trunkRefer to the exhibit. What does the term DYNAMIC indicate in the output that is shown?This entry can only be removed from the MAC address table by a network administrator.When forwarding a frame to the device with address 0060.5c5b.cd23, the switch does not have to perform a lookup to determine the final destination port.Only the device with MAC address 0060.5c5b.cd23 will be allowed to connect to port Fa0/18.The switch learned this MAC address from the source address in a frame received on Fa0/18.Refer to the exhibit. What is the purpose of the configuration commands that are shown?to activate port Fa0/10to make the port a member of VLAN 30to activate port security on port Fa0/10to add VLAN 30 to the trunk that is connected to port Fa0/10。
CCNA第三学期期末答案
假设没有使用 VLSM，添加 ip route 172.16.64.0 255.255.240.0 serial0/0 命令会对网络中正在工作的路由器造成什么影响？3目的地址处于 172.16.64.1 到 172.16.80.254 之间的所有数据包都会通过serial0/0 转发出去。
目的地址处于 172.16.64.1 到 172.16.255.254 之间的所有数据包都会通过serial0/0 转发出去。
目的地址处于 172.16.64.1 到 172.16.79.254 之间的所有数据包都会通过serial0/0 转发出去。
目的地址处于 172.16.0.1 到 172.16.64.254 之间的所有数据包都会通过serial0/0 转发出去。
2请参见图示。
管理员正在向网络中添加新路由器。
IP 地址 192.168.13.6/30 已被分配给 R2 上的相连串行接口。
管理员必须为新路由器的串行接口分配什么IP 地址？2192.168.13.4/30192.168.13.5/30192.168.13.7/30192.168.13.58/30192.168.13.61/27192.168.13.63/273OSPF 路由协议身份验证使用 MD5 验证时，下列有关密钥的说法中哪两项正确？（选择两项。
）24密钥以明文形式在路由器之间传递。
密钥用于帮助生成验证用的加密数字。
密钥以加密形式在路由器之间传递。
密钥永远不会在网络上传输。
数据包嗅探器可以捕获密钥。
4请参见图示。
路由表中将显示哪些路由？1R 10.10.4.0/24 [120/1] via 10.10.10.1, 00:00:12, FastEthernet0/1R 10.10.4.0/24 [120/1] via 10.10.20.1, 00:00:12, FastEthernet0/0R 10.10.4.0/24 [120/2] via 10.10.20.1, 00:00:12, FastEthernet0/0R 10.10.4.0/24 [120/3] via 10.10.30.1, 00:00:12, FastEthernet1/0R 10.10.4.0/24 [120/1] via 10.10.30.1, 00:00:12, FastEthernet1/05请参见图示。
思科第三学期期末考试答案
请参见图示。
所有中继链路工作正常，而且允许所有VLAN使用所有中继链路。
计算机5 ARP请求。
哪台或哪些设备会收到此消息？仅计算机4* 计算机3和RTR-A计算机4和RTR-A计算机1、计算机2、计算机4和RTR-A计算机1、计算机2、计算机3、计算机4和RTR-A所有计算机和路由器F列关于在接入点上启用开放式身份验证的陈述，哪一项是正确的? *不需要身份验证使用64位加密算法需要使用身份验证服务器需要共同商定的密码VL^N Flane Status Ports1ctefauft active FaOl Fa0/2 FaO/3. Fa0/4 10accounting FaO/5. FaCVG Fa0.7 Fa0/820marking actr/e FaO/5, FaO'10, Fa(V11FaO/12. FaO/U FaO/14 research Faons, FaO/16 FaOH7FaO/16. FaO/19. Fa0/201QQ management adve FaO/21, FaQ/22. FaO'23Fa0/24, GiOJ1, G iO/21002W-default act/unsup1003loken-ring-1 efault act/unsup1004■fddinet-ctefaijlt act/unsup1005act/unsup请参见图示。
该交换机用于让图中所示部门的成员实现连接，但不存在路由。
连接到应该能够与accounting VLAN 中的用户通信。
下列哪项更改可实现所需通信？将该用户连接到GiO/1。
*将该用户连接到FaO/6。
将该用户添加到本征VLAN将该用户添加到默认VLAN分层网络模型具有哪三项优点？（选择三项。
）Opti on 1,36带宽争用现象减少」物理布局范围减小网络的容错能力提高无需配线间」无需第三层功能管理和故障排除工作简化FaO/22 IF列关于新交换机默认配置的说法中哪三项正确？（选择三项。
ccna第3本期末
c c n a第3本期末work Information Technology Company.2020YEAR1请参见图示。
需要将一台新主机连接到 VLAN 3。
应该为此新主机分配什么 IP 地址？192.168.1.22 /28192.168.1.31 /28192.168.1.32 /28192.168.1.52 /28192.168.1.63 /282请参见图示。
将 Linksys 集成路由器上的安全模式设置为 WEP 有什么作用？WEP 可标识无线 LAN。
WEP 允许该接入点通知客户端它的存在。
WEP 将 IP 地址转换为容易记忆的域名。
WEP 可加密无线客户端与接入点之间的数据。
WEP 可确保只有授权用户可以访问该 WLAN。
WEP 将一个或一组内部地址转换为外部公有地址。
3请参见图示。
交换机的配置如图所示。
连接到交换机 101-2FL 的主机无法与连接到交换机 101-3FL 且位于对应 VLAN 中的主样才能纠正此问题？将交换机 101-3FL 的 Fa0/2 端口配置为静态中继链路。
在拓扑中加入第 3 层设备或具备第 3 层功能的交换机。
在交换机 101-3FL 上使用switchport trunk allowed vlan all命令允许 VLAN 流量。
4下列哪两种说法正确地描述了生成树协议（选择两项。
）它只在第 2 层使用。
它在交换机上配置。
它消除了网络拓扑中的第 2 层环路。
它限制了端口上所允许的有效 MAC 地址的数量。
5请参见图示。
教师主机连接到交换机 STW 的 Fa0/7 端口。
一位学生想要共享 Internet 访问，于是决定将集线器和笔记本电脑示连接到 STW。
学生如此连接的结果是什么？STW 的 Fa0/7 端口会关闭。
学生会获得访问 Internet 的安全权限。
教师和学生都能接收数据，但只有教师才能发送数据。
从笔记本电脑发出的帧将被丢弃，但教师主机仍与网络保持连通。
ccna_第三学期期末考试
1.VLAN 中继有何用途？通过减少广播流量提高网络性能。
选择在交换网络中传输数据的最佳路径。
通过一条链路传送多个VLAN 的流量。
避免交换网络中出现生成树环路。
请参见图示。
两台交换机都配置有默认的网桥优先级。
如果所有链路都在相同的带宽下运行，哪个端口将作为STP 根端口？S1 的Fa0/1 接口S1 的Fa0/2 接口S2 的Fa0/1 接口S2 的Fa0/2 接口请参见图示。
从图中显示的输出可以得到有关STP 的哪两项结论？（选择两项。
）交换机S1 所配置的STP 优先级值在该网络中最低。
交换机S1 被配置为VLAN1 的根桥。
Fa0/21 是交换机S1 的根端口。
Fa0/22 是冗余链路。
Fa0/24 被视为通往根桥的最佳路径。
下列哪种说法正确描述了生成树路径开销？根据环路中连接的交换机总数计算。
根据给定路径上所有交换机的使用率计算。
根据给定路径上交换机的网桥优先级计算。
根据给定路径上每个交换机端口的端口开销值（由端口速度决定）的总和计算。
使用单臂路由器模型配置VLAN 间路由有哪两项要求？（选择两项。
）每个子接口都应配置有自己的IP 地址、子网掩码和唯一的VLAN 分配。
路由器的物理接口必须连接到相邻交换机上的中继链路。
路由器的物理接口数量应该与VLAN 数量匹配。
应该将不同的静态VLAN 分配给路由器的不同接口。
路由器应该配置为VTP 服务器。
请参见图示。
下列哪两项正确描述了图中所示的路由器配置。
（选择两项。
）在路由器上配置路由协议之前，网络192.168.1.0 与网络192.168.3.0 之间无法成功路由。
路由器子接口上未正确配置VLAN。
该配置适用于单臂路由器网络设计。
路由器子接口上未正确配置中继。
应该为接口Fa0/1 分配IP 地址，否则无法进行路由请参见图示。
下列有关交换机S1 配置的说法中哪项正确？端口Fa0/1 和Fa0/3 使用的是Cisco 专有协议。
已使用switchport mode access命令配置交换机的Fa0/1 和Fa0/3 端口。
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1出于维护目的，已将路由器从网络中移除。
并已将新的 Cisco IOS 软件映像成功下载到服务器并复制到路由器的闪存中。
应该在进行什么操作后再将路由器放回网络中运行？备份新的映像。
将运行配置复制到 NVRAM。
从闪存中删除之前版本的 Cisco IOS 软件。
重新启动路由器并检验新的映像是否成功启动。
答案说明最高分值correctness of responseOption 422请参见图示。
管理员尝试在路由器上配置 IPv6 的 EIGRP，但收到如图所示的错误消息。
配置 IPv6 的 EIGRP 之前，管理员必须发出什么命令？no shutdowneigrp router-id 100.100.100.100ipv6 unicast-routingipv6 eigrp 100ipv6 cef答案说明最高分值correctness of responseOption 323IPv6 EIGRP 路由器使用哪个地址作为 hello 消息的来源？32 位路由器ID接口上配置的 IPv6 全局单播地址所有 EIGRP 路由器组播地址接口 IPv6 本地链路地址答案 说明 最高分值correctness of response Option 424下列关于 EIGRP 确认数据包的说法，哪两项是正确的？（请选择两项。
）发送该数据包是为了响应 hello 数据包。
该数据包用于发现接口上连接的邻居。
该数据包作为单播发送。
该数据包需要确认。
该数据包不可靠。
答案 说明 最高分值correctness of response Option 3 and Option 5 are correct.25何时发送 EIGRP 更新数据包？仅在必要时当获取的路由过期时每 5 秒通过组播发送每 30 秒通过广播发送答案 说明 最高分值correctness of response Option 126请参见图示。
从输出中可以得出哪两条结论？（请选择两项。
）有一个通向网络 192.168.1.8/30 的可行后继路由器。
网络 192.168.10.8/30 可通过 192.168.11.1 到达。
通向网络 192.168.1.0/24 的报告距离为 41024256。
邻居 172.16.6.1 符合到达 192.168.1.0/24 网络的可行性条件。
路由器 R1 具有通向 172.16.3.0/24 网络的两个后继路由器。
答案 说明 最高分值correctness of response Option 1 and Option 4 are correct.27请参见图示。
如果启用自动总结，则哪个或哪些路由会通告给路由器 ISP？10.0.0.0/810.1.0.0/1610.1.0.0/2810.1.1.0/2410.1.2.0/2410.1.3.0/2410.1.4.0/28答案说明最高分值correctness of responseOption 128请参见图示。
有关 R2 路由表中的网络 192.168.1.0 可以得出什么结论？此网络通过同一区域的内部路由器获知。
此网络通过来自 ABR 的总结 LSA 获知。
此网络直接连接到接口 GigabitEthernet0/0。
网络应用于将流量转发到外部网络。
答案 说明 最高分值correctness of response Option 229请参见图示。
公司已从单区域 OSPF 迁移到多区域。
但是，Branch1 办公室中 的用户无法联系新区域中网络 192.168.1.0/24 的任何用户。
根据图中所示的 输出，问题出在哪里？网络 192.168.1.0 的路由表中没有区域间路由。
OSPF 路由进程处于非活动状态。
通向新区域的链路出现故障。
该路由器未与其他 OSPF 路由器建立任何邻接关系。
答案 说明 最高分值correctness of response Option 1210OSPF 路由器何时成为 ABR ？当路由器的接口位于不同区域时当网络管理员将路由器配置为 ABR 时当路由器具有最高路由器 ID 时当路由器的 OSPF 优先级为 0 时答案 说明 最高分值correctness of response Option 1211网络管理员在路由器上升级 IOS 映像之前应检查下列哪个要求？FTP 服务器运行正常。
旧的 IOS 映像文件已删除。
闪存中有足够的空间。
所需的 IOS 映像文件下载到路由器。
答案 说明 最高分值correctness of response Option 3212Cisco IOS 12 和 IOS 15 版本之间有哪两点不同之处？（请选择两项。
）IOS 12 版本具有 15版本所没有的命令。
IOS 15 版许可证密钥对每个设备都是唯一的，而 IOS 12 版许可证密钥不特定于具体设备。
每个 Cisco ISR G2 平台路由器在 IOS 12 版中包括通用映像，但在 IOS 15 版中没有通用映像。
IOS 12.4(20) T1 版是主版本，而 IOS 15.1(1) T1 是新功能版本。
IOS 12版有两个同时进行的系列，而 IOS 15 版也有两个系列，但是这两个 版本分别进行。
答案 说明 最高分值correctness of response Option 2 and Option 5 are correct.213网络管理员在路由器上发出命令 R1(config)# license boot module c1900 technology-package securityk9 。
此命令的用途是什么？IOS 会提示用户重新启动路由器。
安全软件包中的功能将立即可用。
IOS 会提示用户提供 UDI 以激活许可证。
激活安全技术包的评估使用权许可证。
答案 说明 最高分值correctness of response Option 4214网络管理员输入 spanning-tree portfast bpduguard default 命令。
在思科交换机上发出此命令会有什么结果？如果端口接收到 BPDU ，所有交换机端口将为错误禁用状态。
所有 TRUNK 端口可以立即连接到网络，而不是等待融合。
如果端口接收到 BPDU ，配置了 PortFast 的所有交换机端口将为错误禁用状态。
接收 BPDU 的所有交换机端口会忽略 BPDU 消息。
答案 说明 最高分值correctness of response Option 3215网络管理员正在对第 2 层交换网络中性能低下的问题进行故障排除。
在检查 IP 报头时，管理员发现 TTL 值没有减小。
为什么 TTL值没有减少？这是第 2 层网络的正常行为。
MAC 地址表已满。
VLAN 数据库已损坏。
入站接口为半双工设置。
答案 说明最高分值correctness of response Option 1216STP 实例发生故障，并且帧在泛洪网络。
网络管理员应采取什么措施？网络管理员不需要做出响应，因为TTL 字段最终会阻止帧泛洪网络。
应禁用该 STP 实例的生成树，直至找到问题原因。
应调查并消除网络中的广播流量。
应以物理方式删除冗余链路，直到修复 STP 实例。
答案 说明 最高分值correctness of response Option 4217网络工程师正在配置 LAN 的冗余第一跳，以便更好地利用可用网络资源。
工程师应采用哪种协议？FHRP GLBP HSRPVRRP答案 说明 最高分值correctness of response Option 2218哪种模式配置设置可以在交换机 SW1 和 SW2 之间形成 EtherChannel 链路， 而无需发送协商流量？SW1：on SW2：onSW1：desirable SW2：desirableSW1：auto SW2：auto两台交换机均启用中继SW1：auto SW2：auto两台交换机均启用 PortFastSW1：passive SW2：active答案 说明 最高分值correctness of response Option 1219在两台交换机之间配置 EtherChannel 的两个必要条件是什么？（请选择两项。
）交换机上的相关接口必须是连续的。
所有接口要以相同速度运行。
所有接口要以相同的双工模式运行。
所有接口要分配给不同的 VLAN 。
链路两端必须存在不同的 VLAN 允许范围。
答案 说明 最高分值correctness of response Option 2 and Option 3 are correct.220什么时候应该关闭 EIGRP 自动总结？当路由器未在三分钟内发现相邻设备时当路由器具有三个以上的活动接口时当网络包含不连续的网络地址时当路由器具有五个以下的活动接口时当网络编址方案采用 VLSM 时答案 说明 最高分值correctness of response Option 3221要形成包括 5 个接入点的群集，必须满足哪两个条件？（请选择两项。
）必须在 AP 上启用群集模式。
形成群集至少要有两个控制器。
AP 必须连接在相同的网段上。
AP 必须配置使用不同的无线模式。
AP 必须使用不同群集名称。
答案 说明 最高分值correctness of response Option 1 and Option 3 are correct.222IEEE 801.11n 网络用户投诉速度慢。
网络管理员检查 AP 并检验其是否正常运行。
采取什么操作可以提高无线网络性能？分割 802.11n 2.4 GHz 频段和 5 GHz 频段之间的无线流量。
更改 AP 上的身份验证方法。
切换为 802.11g AP 。
将AP 设置为混合模式。
答案说明 最高分值correctness of response Option 1223在当地一所大学里，学生不用密码即可连接到无线网络。
该接入点使用哪种模式？ 网络开放被动共享密钥答案说明 最高分值correctness of response Option 2224哪种无线身份验证方法取决于 RADIUS 身份验证服务器？WEPWPA 个人WPA2 个人WPA2 企业答案 说明 最高分值correctness of response Option 4225请参见图示。
网络管理员可以从此输出得出哪两方面的信息？（请选择两项。
）R1 参与多区域 OSPF 。
使用的 OSPF 进程号为 0。
接口 Fa0/1 不参与 OSPF 进程。
R1 是连接到 10.0.0.4 网络的路由器的分布点。
将要安装到路由表中的 10.0.0.0 路由的度量是 65 (64+1)。