CCNA复习题2
CCNA2 题库
CCNA 2 - Chapter 11What is one advantage of using the cut-through switching method instead of the store-and-forward switching method?has a positive impact on bandwidth by dropping most of the invalid framesmakes a fast forwarding decision based on the source MAC address of the framehas a lower latency appropriate for high-performance computing applications*provides the flexibility to support any mix of Ethernet speeds2A network designer must provide a rationale to a customer for a design which will move an enterprise from a flat network topology to a hierarchical network topology. Which two features of the hierarchical design make it the better choice? (Choose two.)reduced cost for equipment and user trainingless required equipment to provide the same performance levelssimpler deployment for additional switch equipment*easier to provide redundant links to ensure higher availability*lower bandwidth requirements3What are two advantages of modular switches over fixed-configuration switches? (Choose two.)availability of multiple ports for bandwidth aggregationlower forwarding ratesneed for fewer power outlets*lower cost per switchincreased scalability*4Refer to the exhibit. Consider that the main power has just been restored. PC1 asks the DHCP server for IPv4 addressing. The DHCP server sends it an IPv4 address. While PC2 is still booting up, PC3 issues a broadcast IPv4 DHCP request. To which port will SW1 forward this request?to Fa0/1, Fa0/2, and Fa0/4 onlyto Fa0/1, Fa0/2, Fa0/3, and Fa0/4to Fa0/1 and Fa0/2 onlyto Fa0/1, Fa0/2, and Fa0/3 only*to Fa0/1 only5What is one function of a Layer 2 switch?forwards data based on logical addressinglearns the port assigned to a host by examining the destination MAC addressduplicates the electrical signal of each frame to every portdetermines which interface is used to forward a frame based on the destination MAC address*6Refer to the exhibit. Fill in the blank.There are ” 12” collision domains in the topology.7What is a collapsed core in a network design?a combination of the functionality of the access, distribution, and core layersa combination of the functionality of the access and core layersa combination of the functionality of the distribution and core layers*a combination of the functionality of the access and distribution layers 8What are two reasons a network administrator would segment a network with a Layer 2 switch? (Choose two.)to enhance user bandwidth*to eliminate virtual circuitsto create more broadcast domainsto isolate traffic between segments*to isolate ARP request messages from the rest of the networkto create fewer collision domains9Refer to the exhibit.How is a frame sent from PCA forwarded to PCC if the MAC address table on switch SW1 is empty?SW1 forwards the frame directly to SW2. SW2 floods the frame to all ports connected to SW2, excluding the port through which the frame entered the switch.SW1 floods the frame on all ports on the switch, excluding the interconnected port to switch SW2 and the port through which the frame entered the switch.SW1 floods the frame on all ports on SW1, excluding the port through which the frame entered the switch.*SW1 drops the frame because it does not know the destination MAC address.10Place the options in the following order:[+] appropriate for high performance computing applications[+] forwarding process can begin after receiving the destination address [+] may forward invalid frames[#] error checking before forwarding[#] forwarding process only begin after receiving the entire frame [#] only forward valid frames[+] Order does not matter within this group.[#] Order does not matter within this group.11What is a basic function of the Cisco Borderless Architecture distribution layer?aggregating Layer 3 routing boundaries*aggregating all the campus blocksacting as a backboneproviding access to the user12ABC, Inc. has about fifty hosts in one LAN. The administrator would like to increase the throughput of that LAN. Which device will increase the number of collision domains and thereby increase the throughput of the LAN?hubhostNICswitch*13What does the term “port density” represent for an Ethernet switch?the numbers of hosts that are connected to each switch portthe speed of each portthe memory space that is allocated to each switch portthe number of available ports*14Which type of transmission does a switch use when the destination MAC address is not contained in the MAC address table?anycastunicastbroadcast*multicast15What is a basic function of the Cisco Borderless Architecture access layer?aggregates Layer 3 routing boundariesprovides high availabilityaggregates Layer 2 broadcast domainsprovides access to the user*16What information is added to the switch table from incoming frames?source MAC address and incoming port number*destination MAC address and incoming port numberdestination IP address and incoming port numbersource IP address and incoming port number17Fill in the blank.A “converged” network is one that uses the same infrastructure to carry voice, data, and video signals.18An administrator purchases new Cisco switches that have a feature called StackPower. What is the purpose of this feature?It enables many switches to be connected with a special fiber-optic power cable to provide higher bandwidth.It enables the sharing of power among multiple stackable switches.*It enables many switches to be connected to increase port density.It enables many switches to be physically stacked in an equipment rack.It enables AC power for a switch to be provided from a powered patch panel.19Which switch form factor should be used when large port density, fault tolerance, and low price are important factors?fixed-configuration switchmodular switchstackable switch*rackable 1U switch20Refer to the exhibit. Fill in the blank.There are ” 5 ”CCNA 2 - Chapter 2Posted by beotron at 8:59 PM1. A static route that points to the next hop IP will have what administrative distance and metric in the routing table?• administrative distance of 0 and metric of 0• administrative distance of 0 and metric of 1• administrative distance of 1 and metric of 0• administrative distance of 1 and metric of 12. What address can be used to summarize networks 172.16.1.0/24, 172.16.2.0/24, 172.16.3.0/24, and 172.16.4.0/24?• 172.16.0.0/21• 172.16.1.0/22• 172.16.0.0 255.255.255.248• 172.16.0.0 255.255.252.03. The routers in the diagram use the subnet assignments shown. What is the most efficient route summary that can be configured on Router3 to advertise the internal networks to the cloud?• 192.1.1.0/26 and 192.1.1.64/27• 192.1.1.128/25• 192.1.1.0/23 and 192.1.1.64/23• 192.1.1.0/24• 192.1.1.0/25• 192.1.1.0/24 and 192.1.1.64/244. Refer to the exhibit. What is the significance of the /8 in the route to the 10.0.0.0 network?• It indicates that there are 8 hops between this router and the 10.0.0.0 network.• It represents the time, in milliseconds, it takes for a ping to reply when sent to the 10.0.0.0 network.• It indicates that there are 8 subnets in the destination network to which the router can forward packets.• It indicates the number of consecutive bits, from the left, in the destination IP address of a packet that must match 10.0.0.0 to use that route.5. Refer to the exhibit. How will packets destined to the 172.16.0.0 network be forwarded?• Router1 will perform recursive lookup and packet will exit S0/0.• Router1 will perform recursive lookup and packet will exit S0/1.• There is no matching interface associated with network 172.16.0.0 so packets will be dropped.• There is no matching interface associated with network 172.16.0.0 so packets will take gateway of last resort and exit out S0/2.6. A network administrator enters the following command into Router1: ip route 192.168.0.0255.255.255.0 S0/1/0. Router1 then receives a packet that is destined for 192.168.0.22/24. After finding the recently configured static route in the routing table, what does Router1 do next to process the packet? • drops the packet because the destination host is not listed in the routing table• looks up the MAC address of the S0/1/0 interface to determine the destination MAC address of the new frame• performs a recursive lookup for the IP address of the S0/1/0 interface before forwarding the packet• encapsulates the packet into a frame for the WAN link and forwards the packet out the S0/1/0 interface7. Refer to the exhibit. Given the output in the exhibit, how would a clock rate be determined for this link? • The rate would be negotiated by both routers.• A rate would not be selected due to the DCE/DTE connection mismatch.• The rate configured on the DTE determines the clock rate.• The rate configured on the DCE determines the clock rate.8. Refer to the exhibit. Which set of commands will configure static routes that will allow the WinterPark and the Altamonte routers to deliver packets from each LAN and direct all other traffic to the Internet? • WinterPark(config)# ip route 0.0.0.0 0.0.0.0 192.168.146.1Altamonte(config)# ip route 10.0.234.0 255.255.255.0 192.168.146.2Altamonte(config)# ip route 0.0.0.0 0.0.0.0 s0/1• WinterPark(config)# ip route 0.0.0.0 0.0.0.0 192.168.146.1Altamonte(config)# ip route 10.0.234.0 255.255.255.0 192.168.146.2Altamonte(config)# ip route 198.18.222.0 255.255.255.255 s0/1• WinterPark(config)# ip route 172.191.67.0 255.255.255.0 192.168.146.1• WinterPark(config)# ip route 0.0.0.0 0.0.0.0 192.168.146.1Altamonte(config)# ip route 10.0.234.0 255.255.255.0 192.168.146.2• WinterPark(config)# ip route 172.191.67.0 255.255.255.0 192.168.146.1Altamonte(config)# ip route 10.0.234.0 255.255.255.0 192.168.146.2Altamonte(config)# ip route 0.0.0.0 0.0.0.0 s0/09. Hosts on two separate subnets cannot communicate. The network administrator suspects a missing route in one of the routing tables. Which three commands can be used to help troubleshoot Layer 3 connectivity issues? (Choose three.)• ping• show arp• traceroute• show ip route• show interface• show cdp neighbor d etail10. Refer to the exhibit. A company network engineer is assigned to establish connectivity between the two Ethernet networks so that hosts on the 10.1.1.0/24 subnet can contact hosts on the 10.1.2.0/24 subnet. The engineer has been told to use only static routing for these company routers. Which set of commands will establish connectivity between the two Ethernet networks?• R1(config)# ip route 10.1.2.0 255.255.255.0 192.168.0.1R2(config)# ip route 10.1.1.0 255.255.255.0 192.168.0.2• R1(config)# ip route 10.1.2.0 255.255.255.0 192.168.0.2R2(config)# ip route 10.1.1.0 255.255.255.0 192.168.0.1• R1(config)# ip route 10.1.1.0 255.255.255.0 192.168.0.2R2(config)# ip route 10.1.2.0 255.255.255.0 192.168.0.1• R1(config)# ip route 10.1.1.0 255.255.255.0 192.168.0.1R2(config)# ip route 10.1.2.0 255.255.255.0 192.168.0.2• R1(config)# ip route 0.0.0.0 0.0.0.0 10.1.2.1R2(config)# ip route 0.0.0.0 0.0.0.0 10.1.1.111. Which of the following are displayed by the Router# show cdp neighbors command? (Choose three.) • load• platform• reliability• holdtime• local interface12. Refer to the exhibit. What two commands are required to provide connectivity between the192.168.1.0 and 10.0.0.0 networks without requiring recursive lookup? (Choose two.)• A(config)# ip route 10.0.0.0 255.0.0.0 s 0/1/0• A(config)# ip route 10.0.0.0 255.0.0.0 172.16.40.2• A (config)# ip route 10.0.0.0 255.0.0.0 s 0/0/0• B(config)# ip route 192.168.1.0 255.255.255.0 s 0/0/0• B (config)# ip route 192.168.1.0 255.255.255.0 172.16.40.1• B(config)# ip route 192.168.1.0 255.255.255.0 s 0/1/013. Refer to the exhibit. What two commands will change the next-hop address for the 10.0.0.0/8 network from 172.16.40.2 to 192.168.1.2? (Choose two.)• A(config)# no network 10.0.0.0 255.0.0.0 172.16.40.2• A(config)# no ip address 10.0.0.1 255.0.0.0 172.16.40.2• A(config)# no ip route 10.0.0.0 255.0.0.0 172.16.40.2• A(config)# ip route 10.0.0.0 255.0.0.0 s0/0/0• A(config)# ip route 10.0.0.0 255.0.0.0 192.168.1.214. What happens to a static route entry in a routing table when the outgoing interface is not available? • The route is removed from the table.• The router polls neighbors for a replacement route.• The route remains in the table because it was defined as static.• The router redirects the static route to compensate for the loss of the next hop device.15. A router has one static route to each destination network. Which two scenarios would require an administrator to alter the static routes that are configured on that router? (Choose two.)• The destination network no longer exists.• The destination network is moved to a different interface on the same router.• The path between the source and destination is upgraded with a higher bandwidth link.• A topology change occurs where the exi sting next-hop address or exit interface is not accessible.• The remote destination network interface has to be down for 15 minutes of maintenance.16. Why is it advisable to enter a next-hop IP address when creating a static route whose exit interface is an Ethernet network?• Adding the next-hop address eliminates the need for the router to do any lookups in the routing table before forwarding a packet.• In a multi-access network, the router cannot determine the next-hop MAC address for the Ethernet frame without a next-hop address.• Using a next-hop address in a static route provides a route with a lower metric.• In multi-access networks, using a next-hop address in a static route makes that route a candidate default route.17. The output of the Router# show interfaces serial 0/1 command displays the following:• Serial0/1 is up, line protocol is down.• What is the most likely cause for the line protocol being down?• Serial0/1 is shutdown.• There is no cable connecting the routers.• The remote rout er is using serial 0/0.• No clock rate has been set.18. Refer to the exhibit. Which static route should be configured on Router1 so that host A will be able to reach host B on the 172.16.0.0 network?• ip route 192.168.0.0 172.16.0.0 255.255.0.0• ip rou te 172.16.0.0 255.255.0.0 192.168.0.1• ip route 172.16.0.0 255.255.0.0 S0/0/1• ip route 172.16.0.0 255.255.0.0 S0/0/019. What two devices are responsible for converting the data from the WAN service provider into a form acceptable by the router? (Choose two).• the serial port of the router• a modem• a switch• the ethernet port of the router• a CSU/DSU device• a DTE device20. Which of the following is true regarding CDP and the graphic shown?• CDP running on Router D will gather information about routers A, B, C, and E.• By default, Router A will receive CDP advertisements from routers B and C.• If routers D and E are running different routing protocols, they will not exchange CDP information.• Router E can use CDP to identify the IOS running on Router B.21. Which two statements describe functions or characteristics of CDP? (Choose two.)• It starts up automatically and allows the device to detect directly connected neighbor devices that use CDP.• It operates at the network layer and allows two systems to learn about each other.• It creates a topology map of the entire network.• It allows systems to learn about each other even if different network layer protocols are configured.• It forwards advertisements about routes for faster convergence.22. Which piece of information is available from examining the output of the command show ip interface brief?• Interface speed and duplex• Interface MTU• Errors• Interface MAC address• Interface IP addressCCNA 2 - Chapter 31A network administrator is determining the best placement of VLAN trunklinks. Which two types of point-to-point connections utilize VLAN trunking? (Choose two.)between two switches that share a common VLANbetween a switch and a server that has an 802.1Q NIC*between a switch and a client PCbetween a switch and a network printerbetween two switches that utilize multiple VLANs*2What happens to a port that is associated with VLAN 10 when the administrator deletes VLAN 10 from the switch?The port automatically associates itself with the native VLAN. The port creates the VLAN again.The port goes back to the default VLAN.The port becomes inactive.*3Refer to the exhibit. Interface Fa0/1 is connected to a PC. Fa0/2 is a trunk link to another switch. All other ports are unused. Which security best practice did the administrator forget to configure?Configure all unused ports to a ‘black-hole’ VLAN that is not used f or anything on the network.Disable autonegotiation and set ports to either static access or static trunk.Change the native VLAN to a fixed VLAN that is distinct from all user VLANs and to a VLAN number that is not VLAN 1.All user ports are associated with VLANs distinct from VLAN 1 and distinct from the ‘black-hole’ VLAN.*4Which command is used to remove only VLAN 20 from a switch?no switchport access vlan 20delete flash:vlan.datno vlan 20*delete vlan.dat5A Cisco Catalyst switch has been added to support the use of multiple VLANs as part of an enterprise network. The network technician finds it necessary to clear all VLAN information from the switch in order to incorporate a new network design. What should the technician do to accomplish this task?Erase the startup configuration and reboot the switch.Erase the running configuration and reboot the switch.Delete the startup configuration and the vlan.dat file in the flash memory of the switch and reboot the switch.*Delete the IP address that is assigned to the management VLAN and reboot the switch.6What is the effect of issuing a switchport access vlan 20 command on the Fa0/18 port of a switch that does not have this VLAN in the VLAN database?VLAN 20 will be created automatically.*The command will have no effect on the switch.Port Fa0/18 will be shut down.An error stating that VLAN 20 does not exist will be displayed and VLAN 20 is not created.Which command displays the encapsulation type, the voice VLAN ID, and the access mode VLAN for the Fa0/1 interface?show mac address-table interface Fa0/1show interfaces Fa0/1 switchport*show interfaces trunkshow vlan brief8Place the options in the following order:- not scored -dynamic autononegotiatedynamic desirabletrunk9Port Fa0/11 on a switch is assigned to VLAN 30. If the command no switchport access vlan 30 is entered on the Fa0/11 interface, what will happen?Port Fa0/11 will be returned to VLAN 1.*VLAN 30 will be deleted.An error message would be displayed.Port Fa0/11 will be shutdown.What must the network administrator do to remove Fast Ethernet port fa0/1 from VLAN 2 and assign it to VLAN 3?Enter the no vlan 2 and the vlan 3 commands in global configuration mode. Enter the switchport trunk native vlan 3 command in interface configuration mode.Enter the switchport access vlan 3 command in interface configuration mode.*Enter the no shutdown in interface configuration mode to return it to the default configuration and then configure the port for VLAN 3.11Which two Layer 2 security best practices would help prevent VLAN hopping attacks? (Choose two.)Disable DTP autonegotiation on end-user ports.*Change the management VLAN to a distinct VLAN that is not accessible by regular users.Statically configure all ports that connect to end-user host devices to be in trunk mode.Change the native VLAN number to one that is distinct from all user VLANs and is not VLAN 1.*Use SSH for all remote management access.12In a basic VLAN hopping attack, which switch feature do attackers take advantage of?automatic encapsulation negotiationthe default automatic trunking configuration*an open Telnet connectionforwarding of broadcasts13A Cisco switch currently allows traffic tagged with VLANs 10 and 20 across trunk port Fa0/5. What is the effect of issuing a switchport trunk allowed vlan 30 command on Fa0/5?It allows only VLAN 30 on Fa0/5.*It allows a native VLAN of 30 to be implemented on Fa0/5.It allows VLANs 1 to 30 on Fa0/5.It allows VLANs 10, 20, and 30 on Fa0/5.14Refer to the exhibit. A frame is traveling between PC-A and PC-B through the switch. Which statement is true concerning VLAN tagging of the frame?No VLAN tag is added to the frame.*A VLAN tag is added when the frame is accepted by the switch.A VLAN tag is added when the frame is forwarded out the port to PC-B.A VLAN tag is added when the frame leaves PC-A.15Refer to the exhibit. PC-A and PC-B are both in VLAN 60. PC-A is unable to communicate with PC-B. What is the problem?The native VLAN is being pruned from the link.The VLAN that is used by PC-A is not in the list of allowed VLANs on the trunk.*The trunk has been configured with the switchport nonegotiate command. The native VLAN should be VLAN 60.16What VLANs are allowed across a trunk when the range of allowed VLANs is set to the default value?All VLANs will be allowed across the trunk.*Only the native VLAN will be allowed across the trunk.The switches will negotiate via VTP which VLANs to allow across the trunk. Only VLAN 1 will be allowed across the trunk.17Under which two occasions should an administrator disable DTP while managing a local area network? (Choose two.)on links that should not be trunking*when connecting a Cisco switch to a non-Cisco switch*on links that should dynamically attempt trunkingwhen a neighbor switch uses a DTP mode of dynamic autowhen a neighbor switch uses a DTP mode of dynamic desirable18Open the PT Activity. Perform the tasks in the activity instructions and then answer the question.Which PCs will receive the broadcast sent by PC-C?PC-D, PC-E*PC-A, PC-B, PC-D, PC-EPC-A, PC-BPC-A, PC-B, PC-D, PC-E, PC-FPC-A, PC-B, PC-E19Which two statements are true about VLAN implementation? (Choose two.)The network load increases significantly because of added trunking information.Devices in one VLAN do not hear the broadcasts from devices in another VLAN.*The size of the collision domain is reduced.VLANs logically group hosts, regardless of physical location.*The number of required switches in a network decreases.20Refer to the exhibit. DLS1 is connected to another switch, DLS2, via a trunk link. A host that is connected to DLS1 is not able to communicate to a host that is connected to DLS2, even though they are both in VLAN 99. Which command should be added to Fa0/1 on DLS1 to correct the problem?switchport trunk allowed vlan add 99switchport trunk native vlan 66*switchport mode dynamic autoswitchport nonegotiate21Which switch feature ensures that no unicast, multicast, or broadcast traffic is passed between ports that are configured with this feature?switch port securityPVLAN protected port*ACLVLAN22Fill in the blank. Use the full command syntax.The ” show vlan brief” command displays the VLAN assignment for all ports as well as the existing VLANs on the switch.23Which three statements accurately describe VLAN types? (Choose three).An 802.1Q trunk port, with a native VLAN assigned, supports both tagged and untagged traffic.*A management VLAN is any VLAN that is configured to access management features of the switch.*A data VLAN is used to carry VLAN management data and user-generated traffic.Voice VLANs are used to support user phone and e-mail traffic on a network. VLAN 1 is always used as the management VLAN.After the initial boot of an unconfigured switch, all ports are members of the default VLAN.*24Which command should the network administrator implement to prevent the transfer of DTP frames between a Cisco switch and a non-Cisco switch?S1(config-if)# switchport mode trunkS1(config-if)# switchport mode accessS1(config-if)# switchport nonegotiate*S1(config-if)# switchport mode dynamic desirableS1(config-if)# switchport trunk allowed vlan noneCCNA 2 - Chapter 41What type of IPv6 address is required as a minimum on IPv6 enabled interfaces?staticglobal unicastlink-local*loopbackunique local2In order for packets to be sent to a remote destination, what three pieces of information must be configured on a host? (Choose three.)default gateway*hostnameDNS server addressDHCP server addressIP address*subnet mask*3What two pieces of information are displayed in the output of the show ip interface brief command? (Choose two.)MAC addressesLayer 1 statuses*IP addresses*next-hop addressesinterface descriptionsspeed and duplex settings4Place the options in the following order:next hopdestination networkmetric- not scored -administrative distanceroute timestamproute source protocol- not scored -5Which two items are used by a host device when performing an ANDing operation to determine if a destination address is on the same local network? (Choose two.)destination MAC addressnetwork numberdestination IP address*source MAC addresssubnet mask*6Refer to the exhibit. A network administrator issues the show ipv6 route command on R1. What two conclusions can be drawn from the routing table? (Choose two.)Packets that are destined for the network 2001:DB8:ACAD:2::/64 will be forwarded through Fa0/1.R1 does not know a route to any remote networks.*The interface Fa0/1 is configured with IPv6 address2001:DB8:ACAD:A::12.*Packets that are destined for the network 2001:DB8:ACAD:2::54/128 will be forwarded through Fa0/0.The network FF00::/8 is installed through a static route command.7Refer to the exhibit. What is the purpose of the highlighted field in the line that is displayed from the show ip route command?It indicates that this is a directly connected route.It indicates that this route has been deleted from the routing table. It indicates that this route was learned via EIGRP.*It indicates that this is a default route.8Which two statements correctly describe the concepts of administrative distance and metric? (Choose two.)The metric varies depending which Layer 3 protocol is being routed, such as IP.A router first installs routes with higher administrative distances. The value of the administrative distance can not be altered by the network administrator.Routes with the smallest metric to a destination indicate the best path.* Administrative distance refers to the trustworthiness of a particular route.*The metric is always determined based on hop count.9What are two functions of a router? (Choose two.)It manages the VLAN database.It increases the size of the broadcast domain.It controls the flow of data via the use of Layer 2 addresses.It determines the best path to send packets.*It connects multiple IP networks.*10A packet moves from a host on one network to a device on a remote network within the same company. If NAT is not performed on the packet, which two items remain unchanged during the transfer of the packet from source to destination? (Choose two.)destination MAC addresssource ARP tablesource IP address*destination IP address*source MAC addressLayer 2 header11。
CCNA综合试卷2
CCNA集训队综合试卷2 2010.12一、填空题(60*1=60分)1.WWW是____________________的缩写,默认情况下使用的端口号为_________。
2.要查看路由器的接口是DTE还是DCE的命令是:show ________________3.当用ICS双网卡共享上网的时候,共享外网卡时,会把内网卡默认设置成IP:4.路由环路解决方法:, ;毒性逆转/路由中毒; ;5.RIP中路由更新定时器:每隔默认秒,发送完整的路由表拷贝到邻居。
6.从网络拓扑发生变化到网络中所有路由器都知道这个变化的时间就叫7.OSPF中必须用到的主干区域用数字来表示。
8.路由器中不用激活就能使用的接口是______________9.SNMP翻译成中文:ARP翻译成中文:10.MAC地址有位;Ipv4地址位;IPV6地址位。
11.MAC地址翻译成IP地址用协议。
12.OSPF的五种数据包:hello包;;;;13.RIP的管理距离是:OSPF的管理距离:EIGRP的管理距离:14.查看vlan的信息可用命令show ;VLAN的信息保存在,可通过show 查看。
15.交换机工作在层;网桥工作在层;中继器工作在层。
路由器工作在层;Trunking技术是工作在层;16.PT中路由器和电脑相连用线。
(直连线还是交叉线)17.虚拟局域网(VLAN)可以给网络分段,提供灵活性,便于网络管理,最重要的是可以提高网络的性。
18.Trunk中封装VLAN的技术有:802.1Q和(思科特有)。
19.通过一个共有的管理域,维持VLAN配置信息的一致性用的是协议。
20.学校DNS的地址是:;本机回环测试地址是:无锡电信的DNS地址是:21.RG-WALL这是什么东西?22.C类地址的范围是:;B类地址的范围是23.在广播型拓扑结构中,OSPF发送HELLO包的目的地址是:24.OSPF将网络分为四种:PPP,点到多点,,25.OSPF路由器分类主干路由器;自治系统边界路由器(ASBR);26.OSPF中路由器的ID(RID)是如何选举的?先比较,如果就比较27.DR/BDR选举中优先级为0的路由器放弃选举,成为28.一个公司的网络运行的是OSPF,后来收购另一个运行RIP协议的公司,为了使两个公司网络互通,可以采用技术。
CCNA学习指南第2章复习题中英文翻译版
CCNA学习指南第2章复习题中英文翻译版1. What are the decimal and hexadecimal equivalents of the binary number 10011101?(Choose two.)1. 二进制数10011101等效的十进制和十六进制数分别是多少?(选择两项。
)A. 159B. 157C. 185D. 0x9DE. 0xD9F. 0x1592. Which of the following allows a router to respond to an ARP request that is intended for a remote host?2. 下列哪一项允许路由器对远端主机的ARP请求做出响应?A. Gateway DP网关DPB. Reverse ARP (RARP)反向ARPC. Proxy ARP代理ARPD. Inverse ARP逆向ARPE. Address Resolution Protocol (ARP)地址解析协议3. You want to implement a mechanism that automates the IP configuration, including IP address, subnet mask, default gateway, and DNS information. Which protocol will you use to accomplish this?3. 你想实现自动IP配置,包括IP地址,子网掩码,默认网关和DNS信息。
你应该使用什么协议来完成这?A. SMTP简单邮件传输协议B. SNMP简单网络管理协议C. DHCP动态主机控制协议D. ARP地址解析协议4. What protocol is used to find the hardware address of a local device?4. 什么协议用来找本地设备的硬件地址?A. RARPB. ARPC. IPD. ICMPE. BootP5. Which of the following are layers in the TCP/IP model? (Choose three.)5. 下列哪些层属于TCP/IP模型?(选择三项。
ccna第2章考试题
1以下哪个事件发生于传输层三次握手期间?两个应用程序交换数据。
TCP 初始化会话的序列号。
UDP 确定要发送的最大字节数。
服务器确认从客户端接收的数据字节数。
2采用 TCP/IP 数据封装时,以下哪个端口号范围标识了所有常用应用程序?0 到255256 到 10220 到10231024 到204749153 到655353请参见图示。
主机 A 正在使用FTP 从服务器1 下载大型文件。
在下载期间,服务器1 没有收到主机 A 对若干字节传输数据的确认。
服执行什么操作?创建第1 层堵塞信号到达超时时间后重新发送需要确认的数据向主机发送 RESET 位更改第4 层报头中的窗口大小4下列哪项是UDP 的重要特征?确认数据送达数据传输的延迟最短数据传输的高可靠性同序数据传输5下列哪三项功能使 TCP 得以准确可靠地跟踪从源设备到目的设备的数据传输?封装流量控制无连接服务会话创建编号和定序尽力传输6下列哪两项是用户数据报协议(UDP) 的功能?(选择两项)流量控制系统开销低无连接面向连接序列和确认7OSI 模型哪一层负责规范信息从源设备到目的设备准确可靠地流动?应用层表示层会话层传输层网络层8以下哪两个选项代表第4 层编址?(选择两项)标识目的网络标识源主机和目的主机标识正在通信的应用程序标识主机之间的多个会话标识通过本地介质通信的设备9下列哪个传输层协议提供低开销传输因而可用于不需要可靠数据传输的应用场合?TCPIPUDPHTTPDNS10请参见图示。
图中显示的是两台主机之间的TCP 初始数据交换。
假设初始序列号为0,如果数据段6 丢失,确认2 中将包含哪个序列23618503431347511TCP 报头信息和UDP 报头信息中都包含下列哪项信息?定序流量控制确认源和目的12下列哪项由源主机在转发数据时动态选择?目的逻辑地址源物理地址默认网关地址13请参见图示。
从显示的输出中可以确定以下哪两项信息?(选择两项)本地主机使用公认端口号标识源端口。
CCNA考试题
C C N A考试题(总9页) -CAL-FENGHAI.-(YICAI)-Company One1-CAL-本页仅作为文档封面,使用请直接删除第一部分:选择题1:提供可靠数据传输、流控的是OSI的第几层()A、表示层B、网络层C、传输层D、会话层E、链路层2:子网掩码产生在那一层()A、表示层B、网络层C、传输层D、会话层3:当路由器接收的IP报文的目的地址不是本路由器的接口IP地址,并且在路由表中未找到匹配的路由项,采取的策略是()A、丢掉该分组B、将该分组分片C、转发该分组D、以上答案均不对4:当一台主机从一个网络移到另一个网络时,以下说法正确的是()A、必须改变它的IP地址和MAC地址B、必须改变它的IP地址,但不需改动MAC地址C、必须改变它的MAC地址,但不需改动IP地址D、MAC地址、IP地址都不需改动5:ISO提出OSI的关键是()A、系统互联B、提高网络速度C、为计算机制定标准D、经济利益6:OSI参考模型按顺序有哪些层()A、应用层、传输层、网络层、物理层B、应用层、表示层、会话层、网络层、传输层、数据链路层、物理层C、应用层、表示层、会话层、传输层、网络层、数据链路层、物理层D、应用层、会话层、传输层、物理层7:LAN的拓扑形式一般以()为主。
A、总线型B、环型C、令牌环D、载波侦听与冲突检测CSMA/CD8:网段地址154.27.0.0的网络,若不做子网划分,能支持()台主机A、254B、1024C、65,534D、16,777,2069:路由器网络层的基本功能是()。
A、配置IP地址B、寻找路由和转发报文C、将MAC地址解释成IP地址10:选出基于TCP协议的应用程序()。
A、PINGB、TFTPC、TELNETD、OSPF11:某公司申请到一个C类IP地址,但要连接6个的子公司,最大的一个子公司有26台计算机,每个子公司在一个网段中,则子网掩码应设为()。
A、255.255.255.0B、255.255.255.128C、255.255.255.192D、255.255.255.22412:B类地址的缺省掩码是()。
CCNA复习题2
一、不定项选择题1.有效的以太网第 2 层地址有哪三项特征( ABC )A、其长度为 48 个二进制位B、被视为物理地址。
C、通常以十六进制格式表示D、由四个二进制八位数组成。
E、用于确定数据的网络通路F、当网络添加或删除以太网设备时必须更改2.数据链路层帧尾有何主要作用( C )A、定义逻辑拓扑B、提供介质访问控制C、支持帧错误检测D、传送帧的路由信息3.OSI 哪一层负责网络通信的二进制传输、电缆规格和物理方面( D )A、表示层B、传输层C、数据链路层D、物理层4.大多数企业 LAN 中的双绞线网络电缆使用哪种连接器( C )A、BNCB、RJ-11C、RJ-45D、F 型5.将二进制数字 10111010 转换为等值的十六进制数字( C )A、85B、90C、BAD、A1E、B3F、1C6.在使用网络地址 130.68.0.0 和子网掩码 255.255.248.0 时,每个子网上可以分配多少个主机地址( C )A、30B、256C、2046D、2048E、4094F、40967.IP 数据包的哪个字段用于防止无限循环( D )A、服务类型B、标识C、标志D、生存时间E、报头校验和8.路由器使用网络层地址的哪个部分转发数据包( C )A、主机部分B、广播地址C、网络部分D、网关地址9.以下哪三项是私有 IP 地址( BCD )A、172.168.33.1B、10.35.66.70C、192.168.99.5D、172.18.88.90E、192.33.55.89F、172.35.16.510.地址高位部分相同的一组主机地址称为什么( B )A、InternetB、网络地址C、二进制八位数D、广播地址11.如果最多可支持 254 台主机,网络管理员会为网络地址 172.30.1.0 分配什么子网掩码( B )A、255.255.0.0B、255.255.255.0C、255.255.254.0D、255.255.248.012.假设 IP 地址为 172.16.134.64,子网掩码为 255.255.255.224,以下哪项描述的是此地址( C )A、可用主机地址。
CCNA-Exploration-网络基础知识-第二章练习及答案
CCNA Exploration:网络基础知识第二章练习题及答案A.B.C.D.E.F.G.□○1.下列哪些陈述正确指出了中间设备在网络中的作用?(选择三项)□确定数据传输路径□发起数据通信□重新定时和重新传输数据信号□发送数据流□管理数据流□数据流最后的终止点Option 1, Option 3, and Option 5 are correct.2.请选择关于网络协议的正确陈述。
(选择三项。
)□定义特定层 PDU 的结构□规定实现协议层功能的方式□概述层与层之间通信所需的功能□限制了对硬件兼容性的需要□需要取决于协议层的封装过程□杜绝厂商之间的标准化Option 1, Option 3, and Option 5 are correct.3.封装的两个功能是什么?(选择两项)□跟踪终端设备之间的延迟□为通信提供统一的网络路径□在传输前可以修改原始数据□标识属于同一通信的数据片段□确保数据片段可以转发到正确的接收端设备Option 4 and Option 5 are correct.4. 数据链路层封装添加的报尾信息有何主要功能?○支持差错校验○确保数据按照顺序到达○确保送达正确目的○标识本地网络中的设备○帮助中间设备进行处理和路径选择2 points for Option 15. OSI 模型哪两层的功能与 TCP/IP 模型的网络接入层相同?(选择两项)□网络层□传输层□物理层□数据链路层□会话层Option 3 and Option 4 are correct.6. 什么是 PDU?○传输期间的帧损坏○在目的设备上重组的数据○因通信丢失而重新传输的数据包○特定层的封装2 points for Option 47. 以下哪种特征正确代表了网络中的终端设备?□管理数据流□发送数据流□重新定时和重新传输数据信号□确定数据传输路径2 points for Option 28. 请参见图示。
IP 地址为 10.0.0.34 的“手机 A”已经与 IP 地址为 172.16.1.103 的“IP 电话 1”建立了 IP 会话。
CCNA考试题
CCNA考试题一、选择题(每题5分)1、具有第 3 层功能的以太网交换机有哪两项关键功能?(选择两项。
)()A、第 3 层路由功能B、网络地址转换(NA T)C、与远程网络和设备建立远程访问连接D、广播流量管理和组播流量管理E、采用边界网关协议(BGP) 进行自治系统(AS) 间路由2、第 2 层以太网交换机有哪三项功能?(选择三项。
)()A、防止广播B、增大每名用户可用的带宽C、减小冲突域的大小D、在网段间隔离流量E、在不同的网络间路由流量F、减少广播域的数量3、分层网络设计模型中的哪一层称为互连网络的高速主干层,其中高可用性和冗余性是该层的关键?()A、接入层B、分布层C、网络层D、核心层E、工作组层F、 W AN 层4、分层网络设计模型中的哪一层提供了将设备接入网络的途径并控制允许那些设备通过网络进行通信?()A、应用层B、接入层C、分布层D、网络层E、核心层5、在处于不同的VLAN 中的设备间配置通信需要使用OSI 模型中的哪个层?()A、第 1 层B、第 3 层C、第 4 层D、第 5 层6、推荐同时在核心层和分布层采用哪种分层设计特征以在发生路由故障时保护网络?()A、交换B、冗余C、聚合D、访问列表7、为支持客户端关联过程,802.11 标准中指定了哪两种身份验证方法?(选择两项。
)()A、轻型可扩展身份验证协议(EAP)B、共享密钥C、高级加密标准(AES)D、临时密钥完整性协议(TKIP)E、开放式身份验证8、传统路由与单臂路由器有何区别?()A、传统路由只能使用单个交换机接口。
单臂路由器可使用多个交换机接口。
()B、单臂路由器使用子接口将多个逻辑网络连接到单个路由器端口。
传统路由在每个逻辑网络中使用一个端口。
C、传统路由使用路由协议来向其它路由器更新路由。
单臂路由器仅将数据路由到直连网络。
D、单臂路由器不提供多个连接,因此消除了使用STP的需要。
传统路由使用通向路由器的多条路径,因此需要STP。
ccna第四学期final试题(二)
CCNA第四学期《Final Examination》1 一名技术人员正在与竞争对手公司的一名同行聊天,比较两家公司的DSL 传输速率。
两家公司都处于同一个城市,使用同一家服务提供商的服务,且拥有相同的速率/服务计划。
为什么 A 公司报告的下载速度比 B 公司高?公司B 的POTS 语音流量比A 公司的高。
与A 公司相比,B 公司与更多客户共享通向DSLAM 的连接。
A公司在分支点仅使用微型过滤器。
A公司离服务提供商较近。
2请参见图示。
远程用户与服务器之间的SSH 连接发生了故障。
检验表明NAT 配置正确。
此问题最可能的原因是什么?S SH 无法通过NAT。
存在不正确的访问控制列表条目。
访问列表中的SSH 端口号不正确。
必须在S0/0/0 接口上使用ip helper 命令来允许入站连接。
3 CHAP 协议有哪三项特征?(选择三项。
)会在会话过程中交换一个随机的询问号以检验身份会发送身份验证密码以检验身份会防止以明文传输登录信息如果身份验证失败,则会断开PPP 会话连接会发起双向握手容易遭受回送攻击4 命令show frame-relay map 的输出如下:Serial 0 (up): ip 192.168.151.4 dlci 122, dynamic, broadcast, status defined, active下列哪三种说法正确描述了所示内容的意义?(选择三项。
)192.168.151.4 代表远程路由器的IP 地址192.168.151.4 代表本地串行接口的IP 地址D LCI 122 代表远程串行接口D LCI 122 代表用于连接远程地址的本地编号b roadcast 表示动态路由协议(例如RIP v1)可通过此PVC 发送数据包a ctive 表明ARP 进程正在工作5 路由器的SDM 主页会显示哪三点信息?(选择三项。
)A RP 缓存闪存的总容量和可用容量路由表已配置的LAN 接口的数量是否配置了DHCP 服务器该LAN 中路由器的数量6 从什么物理位置起,WAN 连接从由用户负责变为由服务提供商负责?非军事区(DMZ)分界点本地环路网云7请参见图示。
CCNA--期末题2
CCNA复习题一、选择题(每题2分,共80分)1、如下图,两个交换机都使用默认的配置,主机4向主机1发送信息时会使用哪两个目的地址。
(选两个)答案:AFA、主机1的IP地址。
F、路由器R1上的F0/1接口的MAC地址。
2、使用NAT的两个好处是什么?(选择两项)答案:ABA、它可节省公有IP地址。
B、它可增强网络的私密性和安全性。
C、它可增强路由性能。
D、它可降低路由问题故障排除的难度。
E、它可降低通过IPSec实现隧道的复杂性。
3、如下图,对于图中拓扑中vlan之间路由,哪两个选项是正确的?(选两项)答案:DF4、请参见图示,流出R1的流量转换失败,最可能出错的是配置哪个部分?答案:BA、ip nat pool语句B、access-list语句。
C、ip nat inside语句。
D、接口S0/0/2应该拥有一个私有IP地址。
5、以下哪三项是私有IP地址?(选择三项)BCDA、172.16.33.1B、10.35.66.70C、192.168.99.5D、172.18.88.90E、192.33.55.89 F、172.35.16.56、请参见图示。
网络管理员已将192.168.10.0的地址范围分配给网际网络LBMISS,并已使用/29掩码将此地址范围划分为子网,为了满足新建筑的需要,技术人员决定使用第五个子网配置新网络(子网零是第一个子网),根据公司规定,必须始终将第一个可用主机地址分配给路由器接口,并将最后一个可用主机地址分配给工作组服务器。
为了连接到网络,应该在工作组服务器的属性中输入下列哪一项的配置。
答案:CA、IP地址:192.168.10.38 子网掩码:255.255.255.240 默认网关:192.168.10.39B、IP地址:192.168.10.38 子网掩码:255.255.255.240 默认网关:192.168.10.33C、IP地址:192.168.10.38 子网掩码:255.255.255.248 默认网关:192.168.10.33D、IP地址:192.168.10.39 子网掩码:255.255.255.248 默认网关:192.168.10.31E、IP地址:192.168.10.254 子网掩码:255.255.255.0 默认网关:192.168.10.17、路由器接口分配的IP地址为172.16.192.166,子网掩码为255.255.255.248,该IP地址属于哪个子网?答案:DA、172.16.0.0B、172.16.192.0C、172.16.192.128D、172.16.192.160E、172.16.192.168F、172.16.192.1768、如果最多可支持254台主机,网络管理员会为网络地址172.30.1.0分配什么子网掩码?答案:BA、255.255.0.0B、255.255.255.0C、255.255.254.0D、255.255.248.09、下面有关VTP的描述,哪些是正确的? 答案:ABDA、VTP客户模式交换机不能更改本地vlan。
CCNA2期末测试题
1请参见图示。
对于发往192.168.2.0 的数据包,R2 会采取什么操作?它会丢弃数据包。
它会通过S0/0/0 接口转发数据包。
它会通过Fa0/0 接口转发数据包。
它会将数据包转发给R1。
2请参见图示。
R1 会使用哪一总结地址来向R2 通告其网络?3请参见图示。
尽管R2 已配置正确,但主机A 还是无法访问Internet。
可以在R1 上配置哪两条可让主机A 访问Internet 的静态路由?(选择两项。
)ip route .0 0.0.0.0 Fa0/0ip route .0 0.0.0.0 Fa0/1ip routeip routeip route 209.165.202.0 255.255.255.0 .14请参见图示。
网络管理员已按图示配置了R1,并且所有接口都运作正常。
但从R1 ping 172.16.1.1 时失败。
造成此问题的原因可能是什么?R1 上的串行接口配置有误。
默认路由配置有误。
必须在R1 上发出default-information originate命令。
必须在R1 上禁用自动总结。
5请参见图示。
所有接口都已编址,并且运行正常。
网络管理员在主机A 上运行了tracert命令。
得到这种输出的原因可能是什么?(选择两项。
)主机A 缺少网关或配置不正确。
主机B 缺少网关或配置不正确。
R1 的路由表中缺少192.168.1.0/24 的条目。
R2 的路由表中缺少192.168.1.0/24 的条目。
R1 的路由表中缺少192.168.2.0/24 的条目。
R2 的路由表中缺少192.168.2.0/24 的条目。
6请参见图示。
从主机A 到主机B 的ping 成功,但从主机A ping 在Internet 上正常运行的主机却失败了。
此问题的原因是什么?R1 的快速以太网接口被禁用。
其中一条默认路由配置有误。
未在这两台路由器上配置路由协议。
主机A 上尚未配置默认网关。
7 网络管理员使用RIP 路由协议在一个自治系统内实施路由。
ccna试题
ccna试题一、单选题1. 下面哪个是OSI模型的物理层?A. TCPB. IPC. EthernetD. HTTP答案:C2. 以下哪个是IPv6的全球未经分配地址?A. FC00::/7B. 2000::/3C. 8000::/4D. FFFF::/8答案:A3. 以下哪个在OSI模型的会话层工作?A. HTTPB. IPC. TCPD. NetBIOS答案:D二、多选题4. 下面哪些是用于路由器接口配置的命令?(选择两个)A. ip addressB. mac addressC. interfaceD. enable答案:A, C5. 下面哪些是IP协议的特点?(选择三个)A. 可靠传输B. 无连接C. 不可靠传输D. 面向连接答案:B, C, D6. 下面哪些是TCP的特点?(选择三个)A. 面向连接B. 可靠传输C. 无连接D. 面向字节流答案:A, B, D三、填空题7. TCP/IP协议族中,网络接口层对应的是__________。
答案:网络接口8. 在IPv6地址中,一个冒号表示__________。
答案:前缀和后缀之间的分隔符9. 在TCP连接终止过程中,主动关闭连接的一方发送的最后一个ACK分组中ACK标志位的值是__________。
答案:1四、解答题10. 请简要解释TCP/IP协议族中IP协议的作用。
答案:IP(Internet Protocol)协议是TCP/IP协议族中的一种网络层协议,主要负责在网络之间传输数据包。
它使用IP地址来标识网络上的设备,并通过路由选择算法实现数据包的正确传递。
IP协议是一种无连接的协议,不提供数据包的可靠传输,也不保证数据包按顺序到达目的地。
它使用IP头部来存储必要的控制信息,如源IP地址、目的IP地址、数据包长度等。
11. 请简要描述TCP三次握手的过程。
答案:TCP三次握手用于建立一个TCP连接。
过程如下:1. 客户端向服务器发送一个SYN(同步)分组,其中设置SYN标志位为1,并选择一个初始序列号。
ccna第二章章节习题加答案
第1章路由和数据包转发介绍1.下面哪些路由器的组成和它的功能是匹配的?DA.Flash:永久的储存bootstrap程序B.ROM:永久地存储启动配置文件C.NVRAM:永久地存储操作系统镜像D.RAM:存储路由表和ARP缓存2.哪两个命令可以用来检查给路由器串行接口分配的IP地址?A、EA.show interfacesB.show interfaces ip briefC.show controllers allD.show ip configE.show ip interface brief3.下面哪些命令可以设置特权模式口令为“quiz”?AA.R1(config)# enable secret quizB.R1(config)# password secret quizC.R1(config)# enable password secret quizD.R1(config)# enable secret password quiz4.哪个路由原理是正确的?CA.如果一个路由器在它的路由表中具有确定的信息,那么所有邻接的路由也拥有同样的信息B.从一个网络到另外一个网络路径的路由信息意味着存在着反向(或返回)路径的路由信息C.每个路由器根据它自己路由表中的信息,独立作出路由判断D.每个路由器根据它自己和邻居路由表中的信息,独立作出路由判断5.动态路由协议执行哪两个任务?B、DA.发现主机B.更新和维护路由表C.传播主机默认网关D.网络发现E.分配IP地址6.网络工程师正在配置一个新的路由器。
接口已经配置好了IP地址,并且已经激活。
但是还没有配置路由协议或静态路由。
这时路由表中出现的是什么路由?CA.默认路由B.广播路由C.直接路由D.没有路由,路由表也是空的7.下面哪两个对于路由器转发数据包的描述是正确的?B、DA.如果数据包是去往远程网络的,那么路由器会向所有到这个网络的下一跳接口发送该数据包B.如果数据包是去往直连网络的,那么路由器会向路由表中所指示的外出接口发送C.如果数据包是去往远程网络的,那么路由器会根据路由主机表来发送该数据包D.如果数据包是去往远程网络的,那么路由器会向路由表中所指示下一跳IP发送E.如果数据包是去往直连网络的,那么路由器会根据目的MAC地址发送该数据包F.如果数据包是去往直连网络的,那么路由器会转发数据包到下一跳VLAN的交换机8.关于路由协议使用的度量的哪个描述是正确的?AA.度量是路由协议用来检测给定路由的一个测量值B.度量是思科专有的用来转换距离到标准单元的方法C.度量表示了对于所有路由协议中发生的数据包丢失的数量的一个统计值D.路由器使用度量lai 决定哪些包是错误的和要被丢失的9.网络管理员在路由器上配置了ip rout 0.0.0.0 0.0.0.0 serial 0/0/0命令。
CCNA中英文试题两套-推荐下载
14 下列哪两项陈述说明了无线网络安全的特征? (选择两项。)
4
请参见图示。 在 Linksys 集成路由器的 Wireless 菜单选项中,Network Mode 选项 Mixed 是什么意思?
路由器支持加密和身份验证。 路由器支持有线和无线两种连接。 路由器支持 802.11b、802.11g 和 802.11n 设备。 路由器支持通过红外和无线电射频连接。
5 接入点可以使用哪两种身份验证方法? (选择两项。)
WEP WPA EAP ASCII 预共享密钥
6 哪项接入点功能允许网络管理员定义可以进入无线网络的数据类型?
加密 黑客攻击拦截 通信过滤 MAC 地址过滤 身份验证
对全部高中资料试卷电气设备,在安装过程中以及安装结束后进行高中资料试卷调整试验;通电检查所有设备高中资料电试力卷保相护互装作置用调与试相技互术通关,1系电过,力管根保线据护敷生高设产中技工资术艺料0不高试仅中卷可资配以料置解试技决卷术吊要是顶求指层,机配对组置电在不气进规设行范备继高进电中行保资空护料载高试与中卷带资问负料题荷试2下卷2,高总而中体且资配可料置保试时障卷,各调需类控要管试在路验最习;大题对限到设度位备内。进来在行确管调保路整机敷使组设其高过在中程正资1常料中工试,况卷要下安加与全强过,看度并22工且22作尽22下可22都能22可地护以缩1关正小于常故管工障路作高高;中中对资资于料料继试试电卷卷保破连护坏接进范管行围口整,处核或理对者高定对中值某资,些料审异试核常卷与高弯校中扁对资度图料固纸试定,卷盒编工位写况置复进.杂行保设自护备动层与处防装理腐置,跨高尤接中其地资要线料避弯试免曲卷错半调误径试高标方中高案资等,料,编试要5写、卷求重电保技要气护术设设装交备备置底4高调、动。中试电作管资高气,线料中课并敷3试资件且、设卷料中拒管技试试调绝路术验卷试动敷中方技作设包案术,技含以来术线及避槽系免、统不管启必架动要等方高多案中项;资方对料式整试,套卷为启突解动然决过停高程机中中。语高因文中此电资,气料电课试力件卷高中电中管气资壁设料薄备试、进卷接行保口调护不试装严工置等作调问并试题且技,进术合行,理过要利关求用运电管行力线高保敷中护设资装技料置术试做。卷到线技准缆术确敷指灵设导活原。。则对对:于于在调差分试动线过保盒程护处中装,高置当中高不资中同料资电试料压卷试回技卷路术调交问试叉题技时,术,作是应为指采调发用试电金人机属员一隔,变板需压进要器行在组隔事在开前发处掌生理握内;图部同纸故一资障线料时槽、,内设需,备要强制进电造行回厂外路家部须出电同具源时高高切中中断资资习料料题试试电卷卷源试切,验除线报从缆告而敷与采设相用完关高毕技中,术资要资料进料试行,卷检并主查且要和了保检解护测现装处场置理设。备高中资料试卷布置情况与有关高中资料试卷电气系统接线等情况,然后根据规范与规程规定,制定设备调试高中资料试卷方案。
ccna测试题及答案
ccna测试题及答案CCNA测试题及答案一、选择题1. 在Cisco设备上,以下哪个命令用于查看当前的路由表?A. show ip routeB. show running-configC. show interface statusD. show version答案:A2. 以下哪个协议用于在网络中自动发现其他设备?A. ARPB. CDPC. ICMPD. TCP答案:B3. 以下哪个命令用于配置Cisco设备上的接口?A. configure terminalB. interfaceC. ip addressD. hostname答案:A二、填空题4. 在Cisco设备上,使用命令_________可以查看接口的配置信息。
答案:show interface5. 静态路由配置中,_________命令用于指定下一跳地址。
答案:ip route6. 动态路由协议可以自动适应网络变化,其中_________是最常见的一种。
答案:RIP(路由信息协议)三、简答题7. 请简述VLAN(虚拟局域网)的作用。
答案:VLAN是一种将局域网内不同物理位置的设备划分为同一逻辑网络的技术,主要用于隔离广播域,提高网络的安全性和效率。
8. 描述交换机和路由器在网络中的基本功能。
答案:交换机主要用于局域网内部,通过MAC地址表来转发数据帧,实现数据包在局域网内的快速交换。
路由器则工作在网络层,使用IP地址来转发数据包,连接不同的网络,并进行路径选择。
四、计算题9. 假设一个子网掩码为255.255.255.192,计算这个子网的可用IP地址范围。
答案:可用IP地址范围为192.168.1.0到192.168.1.62(包含两端)。
五、实验题10. 请根据以下配置文件,列出Router1的接口配置信息。
```Router1show running-configinterface FastEthernet0/0ip address 192.168.1.1 255.255.255.0duplex autospeed auto!interface FastEthernet0/1no ip addressshutdown!interface Serial0/0/0ip address 10.0.0.1 255.255.255.252clock rate 64000!router ospf 1network 192.168.1.0 0.0.0.255 area 0network 10.0.0.0 0.0.0.3 area 0!```答案:- FastEthernet0/0: IP地址为192.168.1.1,子网掩码为255.255.255.0,双工模式和速度均为自动。
(完整版)CCNA-ITN-第-2-章考试
第2章 配置网络操作系统1 下列哪两项是闪存的特征?(请选择两项。
)闪存提供非易失性存储。
当设备启动时,闪存接收来自 RAM 的 IOS 副本。
重新启动时闪存中的内容可能会丢失。
闪存是思科交换机的组件,但不是思科路由器的组件。
闪存的内容可以被覆盖。
当设备启动时,闪存会保存 IOS ,并将 IOS 副本传输到 RAM 中。
尽管闪存可以升级和覆盖,但它是非易失性存储器。
设备重新启动或断开电源时,闪存内容仍会保留。
答案 说明 最高分值correctness of response Option 1 and Option 5 are correct.1 point for each correct option. 0 points if more options are selected than required.22 网络管理员计划在总部的几个路由器和交换机上升级 IOS 。
继续选择和升级 IOS 之前必须回答哪三个问题?(请选择三项。
)设备是否位于同一 LAN ?设备是否有足够的 NVRAM 来存储 IOS 映像?什么型号的路由器和交换机需要升级?路由器和交换机上安装了哪些端口?路由器和交换机是否有足够的 RAM 和闪存来用于提议的 IOS 版本?设备需要哪些功能?启动配置文件存储在 NVRAM 中,而不是 IOS 中。
升级到新 IOS 版本时应考虑的重要因素包括可用 RAM 和闪存数量、设备类型和型号以及所需功能。
答案 说明 最高分值correctness of response Option 3, Option 5, and Option 6 are correct.1 point for each correct option. 0 points if more options are selected than required.33 当在安全环境下执行初始配置时,下列哪个程序可用来访问 Cisco 2960 交换机?使用 Telnet 通过网络远程访问交换机。
CCNA考试自测题2新
CCNA考试自测题2我为大家收集整理了《CCNA考试自测题2》供大家参考,盼望对大家有所关心!!!25) Which statement is true of WinSock (下面对Wi n S o c k的哪一句陈述是正确的)?A. It is a MAC applicationB. It represents a graphical user interfaceC. It represents a network layerD. It provides the means for sharing an Internet connection between multiple IP protocol suite utilities26) Which statement is true of TLI (下面关于T L I的哪一句陈述是正确的)?A. It is a layer in the OSI modelB. It is a layer in the TCP/IP modelC. It is a System V APID. It is part of the UNIX Kernel27) Which statement is true of Windows Name Server (WINS) (下面对于Windows 命名服务器( W I N S )的陈述中,哪一句是正确的)?A. It is a protocolB. It provides capability for name resolutionC. It is a network layerD. It is a proprietary name serverE. A, B, and D onlyF. B and D only28) ICMP、I P、ARP and RARP of the IP protocol suite map to (IP协议套件的I C M P、I P、A R P和R A R P映射到):A. OSI layers 1 and 2B. OSI layer 5C. OSI layer 3D. OSI layer 229) Which layer is most important in providing reliable data exchange between two systems (在两个系统之间供应牢靠的数据交换中,哪一层是最重要的)?A. Physical layerB. Data link layerC. Session layerD. Transport layer30) Which of the following does TCP provide (TCP供应了下面的哪一个功能)?A. Unreliable data streamB. Connectionless virtual circuitC. Flow controlD. Structured byte stream movement31) Of the following, which field is not a part of the TCP header (在下面各项中,哪一个字段不是T C P报头的一部分)?A. Subnet maskB. Sequence numberC. Data offsetD. Destination port32) What is the sequence number in a TCP header used for (在T C P 报头中的挨次号的作用是什么)?A. AcknowledgmentsB. Reordering of the octets receivedC. Rejecting duplicate octets33) Variable sliding windows provide an explicit mechanism for notifying TCP if an intermediate node (for example, a router) becomes congested (在中间节点,例如一个路由器拥塞的状况下,可变滑动窗口供应了通知T C P的显式机制)。
CCNA复习题
CCNA复习题⼀、选择题(每题2分,共80分,请将答案填⼊答题卡)1、客户端使⽤哪种协议来浏览web 服务器?A.FTPB.HTTPC.POPD.SMTP2、DNS 服务器的功能是什么?A.将IP 地址映射为MAC 地址。
B.将计算机或域名转换为相应的IP 地址。
C.管理客户端所在的域。
D.接收从客户端发来的HTTP 请求。
3、在源主机和⽬的主机之间传输的TCP/IP 数据通过以下四个步骤解包:A. 去除TCP 报头。
B.解码⽐特流,识别出⽬的MAC 地址。
C. 去除IP 报头,将数据包内容发送给下⼀层。
D. 去除以太⽹帧头和帧尾。
这些步骤的正确顺序是什么?A.A, B, C, DB.A, C, B, DC.B, C, D, AD.B, D, C, AE.C, A, B, D4、当某个域内其中⼀台主机发送帧时,域内的所有其它主机都会收到该帧。
并且,路由器限定了该域的边界。
该域属于哪⼀类型?A.⼴播B.冲突C.本地D.组播5、客户端使⽤哪种协议通过TCP/IP 连接从远程服务器检索电⼦邮件?A.DNSB.FTPC.POPD.HTTP6、哪两项陈述正确描述了MAC 地址?(选择两项。
)A.MAC 地址⽤于标识特定的NIC。
B.MAC 地址包含⽹络号和唯⼀的主机标识。
C.MAC 地址是物理地址。
D.MAC 地址始终由⽹络管理员分配给⽹络设备。
E.MAC 地址是第3 层地址。
7、下⾯哪些是TCP/IP 模型的传输层协议?(选择两项。
)A.FTPB.UDPC.SMTPD.TFTPE.TCP8、以下哪两项是DHCP 服务的特性?(选择两项。
)A.DHCP 客户端确定使⽤由DHCP 服务器提供的IP 地址的租期。
B.集成路由器充当DHCP 服务器向ISP 提供IP 地址。
C.DHCP 客户端向⽬的IP 地址255.255.255.255 发送DHCP 发现消息。
D.DHCP 服务器将IP 地址映射到主机名。
E.集成路由器充当本地⽹络中内部主机的DHCP 服务器。
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一、不定项选择题
1.有效的以太网第 2 层地址有哪三项特征( ABC )
A、其长度为 48 个二进制位
B、被视为物理地址。
C、通常以十六进制格式表示
D、由四个二进制八位数组成。
E、用于确定数据的网络通路
F、当网络添加或删除以太网设备时必须更改
2.数据链路层帧尾有何主要作用( C )
A、定义逻辑拓扑
B、提供介质访问控制
C、支持帧错误检测
D、传送帧的路由信息
3.OSI 哪一层负责网络通信的二进制传输、电缆规格和物理方面( D )
A、表示层
B、传输层
C、数据链路层
D、物理层
4.大多数企业 LAN 中的双绞线网络电缆使用哪种连接器( C )
A、BNC
B、RJ-11
C、RJ-45
D、F 型
5.将二进制数字 10111010 转换为等值的十六进制数字( C )
A、85
B、90
C、BA
D、A1
E、B3
F、1C
6.在使用网络地址 130.68.0.0 和子网掩码 255.255.248.0 时,每个子网上可以分配多少个主机地址( C )
A、30
B、256
C、2046
D、2048
E、4094
F、4096
7.IP 数据包的哪个字段用于防止无限循环( D )
A、服务类型
B、标识
C、标志
D、生存时间
E、报头校验和
8.路由器使用网络层地址的哪个部分转发数据包( C )
A、主机部分
B、广播地址
C、网络部分
D、网关地址
9.以下哪三项是私有 IP 地址( BCD )
A、172.168.33.1
B、10.35.66.70
C、192.168.99.5
D、172.18.88.90
E、192.33.55.89
F、172.35.16.5
10.地址高位部分相同的一组主机地址称为什么( B )
A、Internet
B、网络地址
C、二进制八位数
D、广播地址
11.如果最多可支持 254 台主机,网络管理员会为网络地址 172.30.1.0 分配什么子网掩码( B )
A、255.255.0.0
B、255.255.255.0
C、255.255.254.0
D、255.255.248.0
12.假设 IP 地址为 172.16.134.64,子网掩码为 255.255.255.224,以下哪项描述的是此地址( C )
A、可用主机地址。
B、广播地址。
C、网络地址。
D、不是有效地址。
13.IPv6 地址由多少位组成( A )
A、128
B、64
C、48
D、32
14.封装的两个功能是什么?(选择两项)( DE )
A、跟踪终端设备之间的延迟
B、为通信提供统一的网络路径
C、在传输前可以修改原始数据
D、标识属于同一通信的数据片段
E确保数据片段可以转发到正确的接收端设备
15.OSI 模型哪两层的功能与 TCP/IP 模型的网络接入层相同?( CD )
A、网络层
B、传输层
C、物理层
D、数据链路层
E、会话层
16.哪一层负责将数据段封装成数据包?( C )
A、物理层
B、数据链路层
C、网络层
D、传输层
17.以下哪些应用层协议正确匹配了相应的功能?(选择两项)( BC )
A、DNS 为主机动态分配 IP 地址
B、HTTP 从 Web 服务器向客户端传输数据
C、POP 从客户端向电子邮件服务器分发电子邮件
D、SMTP 支持文件共享
E、Telnet 提供远程访问的虚拟连接
18.OSI 模型哪层负责规范信息从源设备到目的设备准确可靠地流动( D )
A、应用层
B、表示层
C、会话层
D、传输层
E、网络层
19.从源向目的传送数据段的过程中,TCP 使用什么机制提供流量控制( C )
A、序列号
B、会话创建
C、窗口大小
D、确认
20.路由器根据什么信息在不同的路由器接口之间转发数据包( A )
A、目的网络地址
B、源网络地址
C、源 MAC 地址
D、公认端口目的地址
二、填空题
1、直通双绞线的线序为。
2.OSI 模型各层从最高层到最低层。
三、名词解释题
1.TCP TCP:传输控制协议(TCP:Transmission Control Protocol)传输控制协议TCP 是TCP/IP 协议栈中的传输层协议,它通过序列确认以及包重发机制,提供可靠的数据流发送和到应用程序的虚拟连接服务。
2.PPP PPP多重连接是指可以用多条线路来联网,从而得到更多的带宽,例如,如果电信局支持PPP多重链接,就可以同时用X条电话线路上网(X>=1),这样得到的带宽就是一条线路的X 倍。
"ppp 多重链接帧关"表示目前不支持多重连接,即不能像以上描述中的那样连接。
3.LLC LLC是Logical Link Control的缩写,意为:逻辑链路控制。
是局域网中数据链路层的上层部分,IEEE 802.2中定义了逻辑链路控制协议。
4.DHCP DHCP(Dynamic Host Configuration Protocol,动态主机配置协议)是一个局域网的网络协议,使用UDP协议工作,主要有两个用途:给内部网络或网络服务供应商自动分配IP
地址,给用户或者内部网络管理员作为对所有计算机作中央管理的手段,在RFC 2131中有详细的描述。
DHCP有3个端口,其中UDP67和UDP68为正常的DHCP服务端口,分别作为DHCP Server和DHCP Client的服务端口;546号端口用于DHCPv6 Client,而不用于DHCPv4,是为DHCP failover服务,这是需要特别开启的服务,DHCP failover是用来做“双机热备”的。
5.WAN 广域网WAN(WideAreaNetwork)也叫远程网RCN(RemoteComputerNetwork),它的作用范围最大,一般可以从几十公里至几万公里。
一个国家或国际间建立的网络都是广域网。
在广域网内,用于通信的传输装置和传输介质可由电信部门提供。
目前,世界上最大的信息网络Internet已经覆盖了包括我国在内的180多个国家和地区,连接了数万个网络,终端用户已达数千万.并且以每月15%的速度增长。