最新ccna2答案第五章汇总
CCNA-Exploration-网络基础知识-第五章练习及答案
○10.10.10.26○127.0.0.1○10.10.10.6○10.10.10.1○224.0.0.0
□R1使用192.168.0.1作为下一跳地址将数据包从192.168.12.0网络路由到172.16.0.0网络。
□R3使用172.16.0.1作为下一跳地址将数据包从10.0.0.0网络路由到172.16.0.0网络。
□R2使用192.168.0.1作为下一跳地址将数据包从172.16.0.0网络路由到192.168.12.0网络。
15．请参见图示。图中显示的所有设备均为出厂默认设置。图示拓扑代表多少个广播域？
○3○4○5○7○8○11Otion 216．下列关于路由及其用途的陈述，哪三项是正确的？（选择三项）
□如果找不到通往目的网络的路由，则将数据包返回前一个路由器。
□如果目的网络直接连接的网络，路由器会将数据包转发到目的主机。
○路由器发送ARP请求以确定所需的下一跳地址。
○路由器丢弃数据包。
○路由器将数据包转发到ARP表所示的下一跳。
○路由器将数据包转发到源地址所示的接口。
○路由器将数据包从默认路由条目所确定的接口发出。
Option 2 and Option 5 are correct.
11．将主机分组到同一个网络时应考虑哪些关键因素？（选择三项）
□网关□用途□物理编址□软件版本□地理位置□所有权
Option 2, Option 5, and Option 6 are correct.
12．以下哪一项是路由表条目的组成部分？
（完整版）计算机网络（第二版）胡亮等编著第五章习题及答案
（完整版）计算机⽹络（第⼆版）胡亮等编著第五章习题及答案复习指南：本章共有5.1-5.7七节内容，没有在考试之外的。
5.1-5.2，⽤时25min。
5.3-5.4，⽤时90min。
5.5，⽤时30min。
5.6，⽤时60min。
5.7，⽤时35min。
参考上课⽤时，可推测重点章节为5.3，5.4，5.6。
推荐看PPT。
5.5，5.7掌握概念。
5.1，5.2简单了解。
课后习题：5.1 通讯⼦⽹的最⾼层是哪⼀层？5.2 ⽹络层的两个主要功能是什么？5.3 在OSI模型中，⽹络层提供了哪两种服务？5.4 ⾯向连接的⽹络服务完成⼀次传输需要哪⼏个过程？5.5 说明⾯向连接的服务和⾯向⽆连接的服务的优缺点。
5.6 说明为什么在⽹络中各个结点对虚电路进⾏独⽴编号。
5.7 第三层交换机与传统的路由器相⽐有哪些优点？5.8 路由选择的最基本要求是什么？5.9 什么是⾮适应性路由选择？什么是适应性路由选择？5.10 什么是拥塞？拥塞产⽣的原因是什么？拥塞对系统有什么影响？5.11 拥塞控制的⽅法有哪些？5.12 在流量控制中，如果采⽤数据报⽅式⼯作，容易产⽣什么样的死锁？如果采⽤虚电路的⽅式⼯作，容易产⽣什么样的死锁？5.13 常⽤的计算最短路径的⽅法有哪两种？5.14 ⽐较距离向量路由和链状状态路由？OSPF属于哪类路由协议？BGP协议属于哪类协议？习题参考答案：5.1 通讯⼦⽹的最⾼层是哪⼀层？⽹络层是通讯⼦⽹的最⾼层，也是主机和通讯⼦⽹的接⼝。
5.2 ⽹络层的两个主要功能是什么？交换和路由。
交换是在两个或者多个设备之间建⽴临时链接，使没有物理链路直接相连的两个或者多个设备之间能够通信。
路由是选择从⼀点到另⼀点发送数据包的最佳路径。
5.3 在OSI模型中，⽹络层提供了哪两种服务？OSI: ⾯向连接的⽹络服务（CONS）和⾯向⽆连接的⽹络服务（CLNS）。
TCP/IP: ⾯向⽆连接的⽹络服务（CLNS）。
5.4 ⾯向连接的⽹络服务完成⼀次传输需要哪⼏个过程？发送者发送⼀个连接请求包，接收者使⽤⼀个连接确认包进⾏确认，发送者传输数据，发送者发送⼀个连接终⽌请求包，接收者使⽤⼀个连接终⽌包进⾏确认。
ccna第五章考试题
1对网络电缆采用的连接器不正确可能产生什么后果？会将数据转发到错误的节点。
通过该电缆传输的数据可能发生信号丢失。
将对该电缆中传输的数据采用不正确的信号方法。
该电缆中发送的数据所采用的编码方法将更改，用于补偿不当连接。
2大多数企业LAN 中的双绞线网络电缆使用哪种连接器？BNCRJ-11RJ-45F 型3在网络中传输数据时，物理层的主要作用是什么？创建信号以表示介质上每个帧中的比特为设备提供物理编址确定数据包的网络通路控制数据对介质的访问4数据传输的三种量度标准是什么？（选择三项）实际吞吐量频率幅度吞吐量串扰带宽5UTP 电缆的哪个特征有助于减少干扰的影响？屏蔽层中的金属编织包裹核心的反射涂层电缆中的线对绕绞外皮中的绝缘材料6XYZ 公司正在其数据网络中安装新的电缆。
下列哪两种类型是新架设时最常用的电缆？（选择两项）同轴4 类UTP5 类UTP6 类UTPSTP7使用什么设备可以检查安装的光纤是否存在错误并检查其完整性和介质性能？光注入器OTDRTDR万用表8以下哪项是单模光缆的特征？一般使用LED 作为光源因为有多条光通路，核心相对较粗价格比多模低一般使用激光作为光源9请参见图示。
哪种 5 类电缆用于在主机 A 和主机 B 之间建立以太网连接？同轴电缆全反电缆交叉电缆直通电缆10以下哪项被视为选择无线介质的优点？主机移动更方便安全风险更低减少干扰的影响环境对有效覆盖面积的影响更小11如果在网络中使用非屏蔽双绞线铜缆，导致线对内串扰的原因是什么？相邻线对周围的磁场使用编织线屏蔽相邻线对从电缆远端反射回来的电波因两个节点尝试同时使用介质而导致的冲突12哪种光纤连接器支持全双工以太网？13哪种电缆通常与光缆相关联？主干电缆水平电缆跳线电缆工作区域电缆14在可能存在电气危险或电磁干扰的LAN 安装中，主干布线建议使用哪种类型的介质？同轴光纤5e 类UTP6 类UTP15网络中什么时候使用直通电缆？通过控制台端口连接路由器时连接两台交换机时连接主机与交换机时连接两台路由器时16以下哪些特征描述的是光缆？（选择两项）不受 EMI 或RF I 影响。
CCNA第一学期第五章答案
C C N A第一学期第五章答案集团文件版本号：（M928-T898-M248-WU2669-I2896-DQ586-M1988）最新CCNA第一学期第五章答案一个 MAC 地址包含 6 个字节。
前 3 个字节用于供应商标识，最后 3 个字节必须在同一 OUI 中分配唯一的值。
MAC 地址在硬件中实施。
网卡需要使用 MAC 地址来通过 LAN 通信。
IEEE 规范了 MAC 地址。
争用方法具有不确定性，没有受控访问方法中遇到的开销。
因为设备不需要轮流访问介质，所以无需跟踪次序。
争用方法在介质使用率高的情况下无法很好地扩展。
逻辑链路控制在软件中实施，能够让数据链路层与协议簇的上层协议通信。
网卡驱动程序软件直接与网卡上的硬件交互，可在 MAC 子层和物理介质之间传输数据。
逻辑链路控制在 IEEE 802.2 标准中指定。
IEEE 802.3 是定义不同以太网类型的一组标准。
MAC（介质访问控制）子层负责定位和检索介质上和介质外的帧。
组播 MAC 地址是一个特殊的十六进制数值，以 01-00-5E 开头。
然后将IP 组播组地址的低 23 位换算成以太网地址中剩余的 6 个十六进制字符，作为组播 MAC 地址的结尾。
MAC 地址的剩余位始终为“0”。
在此例中：224（十进制）=> 01-00-5E34（十进制）= 00100010（二进制）= 22（十六进制）56（十进制）= 00111000（二进制）= 38（十六进制）综合结果：01:00:5E:0B:22:38如果整个路径都基于以太网，则目的和源 MAC 地址将随着每个路由器跳数发生变化。
除非网络地址转换处于活动状态，否则目的 IP 地址在整个路径中保持不变。
请参见图示。
由于 PC1 需要向 PC2 发送数据包，因此 PC1 发出一个ARP 请求。
在这种情况下，接下来将发生什么？当一台网络设备要与相同网络中的另一台设备通信时，它会发送广播ARP 请求。
CCNA第一学期各章习题及答案
诶了我累了目录第二章网络通信P2-8第三章应用层功能及协议P9-14第四章OSI传输层P15-20第五章OSI网络层P21-27第六章网络编址-IPv4 P28-34第七章数据链路层P35-40第八章OSI物理层P41-45第九章以太网P46-51第十章网络规划和布线P52-61第十一章配置和测试网络P62-70第一学期末考试P71-91文档末尾返回目录第二章网络通信001 TCP/IP 网络接入层有何作用？路径确定和数据包交换数据表示、编码和控制可靠性、流量控制和错误检测详细规定构成物理链路的组件及其接入方法将数据段划分为数据包002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003下列哪三项陈述是对局域网 (LAN) 最准确的描述？（选择三项）LAN 通常位于一个地域内。
此类网络由由一个组织管理。
LAN 中的不同网段之间一般通过租用连接的方式连接。
此类网络的安全和访问控制由服务提供商控制。
LAN 为同一个组织内的用户提供网络服务和应用程序访问。
此类网络的每个终端通常都连接到电信服务提供商 (TSP)。
004 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005 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006请参见图示。
所示网络属于哪一类型？WANMANLANWLAN007 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008 第 4 层端口指定的主要作用是什么？标识本地介质中的设备标识源设备和目的设备之间的跳数向中间设备标识通过该网络的最佳路径标识正在通信的源终端设备和目的终端设备标识终端设备内正在通信的进程或服务009 请参见图示。
CCNA 2 Practice Final v5 answers 2013
CCNA 2 Practice Final v5 answers 20131What is the order of packet types used by an OSPF router to establish convergence? Hello, DBD, LSR, LSU, LSAckLSAck, Hello, DBD, LSU, LSRLSU, LSAck, Hello, DBD, LSRHello, LSAck, LSU, LSR, DBD2Which two keywords can be used in an access control list to replace a wildcard mask or address and wildcard mask pair? (Choose two.)mostallgthostanysome3Which network design may be recommended for a small campus site that consists of a single building with a few users?a collapsed core network designa network design where the access and core layers are collapsed into a single layera three-tier campus network design where the access, distribution, and core are all separate layers, each one with very specific functionsa network design where the access and distribution layers are collapsed into a single layer 4Refer to the exhibit. A network administrator is configuring inter-VLAN routing on a network. For now, only one VLAN is being used, but more will be added soon. What is the missing parameter that is shown as the highlighted question mark in the graphic?It identifies the subinterface.It identifies the native VLAN number.It identifies the number of hosts that are allowed on the interface.It identifies the VLAN number.It identifies the type of encapsulation that is used.5A router with two LAN interfaces, two WAN interfaces, and one configured loopback interface is operating with OSPF as its routing protocol. What does the router OSPF process use to assign the router ID?the IP address of the interface that is configured with priority 0the highest IP address on the LAN interfacesthe OSPF area ID that is configured on the interface with the highest IP addressthe highest IP address that is configured on the WAN interfacesthe loopback interface IP addressRefer to the exhibit. A PC at address 10.1.1.45 is unable to access the Internet. What is the most likely cause of the problem?The NAT pool has been exhausted.The inside and outside interfaces have been configured backwards.The wrong netmask was used on the NAT pool.Access-list 1 has not been configured properly.7Which DHCP IPv4 message contains the following information?Destination address: 255.255.255.255Client IPv4 address: 0.0.0.0Default gateway address: 0.0.0.0Subnet mask: 0.0.0.0DHCPOFFERDHCPREQUESTDHCPACKDHCPDISCOVERRefer to the exhibit. R1 and R2 are OSPFv3 neighbors. Which address would R1 use as the next hop for packets that are destined for the Internet?2001:DB8:C5C0:1::22001:DB8:ACAD:1::2FE80::21E:BEFF:FEF4:5538FF02::59Which command will create a static default route on R1 to send all traffic to the Internet and use serial 0/0 as the exit interface?R1(config)# ip route 0.0.0.0 255.255.255.0 serial 0/0R1(config)# ip route 255.255.255.255 0.0.0.0 serial 0/0R1(config)# ip route 0.0.0.0 0.0.0.0 serial 0/0R1(config)# ip route 0.0.0.0 255.255.255.255 serial 0/010A client is using SLAAC to obtain an IPv6 address for its interface. After an address has been generated and applied to the interface, what must the client do before it can begin to use this IPv6 address?It must send an ICMPv6 Neighbor Solicitation message to ensure that the address is not already in use on the network.It must send a DHCPv6 INFORMATION-REQUEST message to request the address ofthe DNS server.It must send an ICMPv6 Router Solicitation message to determine what default gateway it should use.It must send a DHCPv6 REQUEST message to the DHCPv6 server to request permission to use this address.11What is the effect of the access control list wildcard mask 0.0.0.15? (Choose two.)The first 32 bits of a supplied IP address will be matched.The first 28 bits of a supplied IP address will be ignored.The last four bits of a supplied IP address will be ignored.The last four bits of a supplied IP address will be matched.The last five bits of a supplied IP address will be ignored.The first 28 bits of a supplied IP address will be matched.12How will a router handle static routing differently if Cisco Express Forwarding is disabled?It will not perform recursive lookups.Static routes that use an exit interface will be unnecessary.Serial point-to-point interfaces will require fully specified static routes to avoid routing inconsistencies.Ethernet multiaccess interfaces will require fully specified static routes to avoid routing inconsistencies.13Fill in the blank.Using router-on-a-stick inter-VLAN routing, how many subinterfaces have to be configured to support 10 VLANs?1014Refer to the exhibit. The student on the H1 computer continues to launch an extended ping with expanded packets at the student on the H2 computer. The school network administrator wants to stop this behavior, but still allow both students access toweb-based computer assignments. What would be the best plan for the network administrator?Apply an outbound standard ACL on R2 S0/0/1.Apply an inbound standard ACL on R1 Gi0/0.Apply an outbound extended ACL on R1 S0/0/1.Apply an inbound extended ACL on R1 Gi0/0.Apply an inbound extended ACL on R2 Gi0/1.15What is an advantage of using dynamic routing protocols instead of static routing?fewer router resource overhead requirementsability to actively search for new routes if the current path becomes unavailable more secure in controlling routing updateseasier to implement16A network administrator is testing IPv6 connectivity to a web server. The network administrator does not want any other host to connect to the web server except for the one test computer. Which type of IPv6 ACL could be used for this situation?an extended, named, or numbered ACLonly a named ACLonly an extended ACLonly a standard ACLa standard or extended ACL17Refer to the exhibit. Host A has sent a packet to host B. What will be the source MAC and IP addresses on the packet when it arrives at host B?Source MAC: 00E0.FE91.7799Source IP: 192.168.1.1Source MAC: 00E0.FE10.17A3Source IP: 192.168.1.1Source MAC: 00E0.FE91.7799Source IP: 10.1.1.1Source MAC: 00E0.FE10.17A3Source IP: 10.1.1.10Source MAC: 00E0.FE91.7799Source IP: 10.1.1.1018How many classful networks are summarized by the static summary route ip route192.168.32.0 255.255.248.0 S0/0/0?4281619.A small company has a web server in the office that is accessible from the Internet. The IP address 192.168.10.15 is assigned to the web server. The network administrator is configuring the router so that external clients can access the web server over the Internet. Which item is required in the NAT configuration?an ACL to identify the local IPv4 address of the web serverthe ip nat inside source command to link the inside local and inside global addressesthe keyword overload for the ip nat inside source commandan IPv4 address pool20What is a result of connecting two or more switches together?The number of collision domains is reduced.The size of the broadcast domain is increased.The number of broadcast domains is increased.The size of the collision domain is increased.21Refer to the exhibit. If the IP addresses of the default gateway router and the DNS server are correct, what is the configuration problem?The DNS server and the default gateway router should be in the same subnet.The default-router and dns-server commands need to be configured with subnet masks. The IP address of the DNS server is not contained in the excluded address list.The IP address of the default gateway router is not contained in the excluded address list.22When routing a large number of VLANs, what are two disadvantages of using therouter-on-a-stick inter-VLAN routing method rather than the multilayer switch inter-VLAN routing method? (Choose two.)Multiple SVIs are needed.Multiple subinterfaces may impact the traffic flow speed.Router-on-a-stick requires subinterfaces to be configured on the same subnets.Router-on-a-stick requires multiple physical interfaces on a router.A dedicated router is required.23How is the router ID for an OSPFv3 router determined?the highest EUI-64 ID on an active interfacethe highest IPv4 address on an active interfacethe highest IPv6 address on an active interfacethe lowest MAC address on an active interface24What does an OSPF area contain?routers whose SPF trees are identicalrouters that have the same link-state information in their LSDBsrouters that share the same router IDrouters that share the same process ID25Which command will verify the status of both the physical and the virtual interfaces on a switch?show ip interface briefshow running-configshow vlanshow startup-config26Which switching method provides error-free data transmission?fast-forwardintegrity-checkingstore-and-forwardfragment-free27What is associated with link-state routing protocols?split horizonshortest-path first calculationslow processor overheadrouting loopspoison reverse28Refer to the exhibit. Which would be chosen as the router ID of R2? 2001:DB8:CAFE:A001::/642001:DB8:CAFE:2::/64The router ID has to be manually configured.LLA: FE80::229Place the options in the following order: Step 3– target left blank –Step 4Step 2Step 130Refer to the exhibit. A network administrator is investigating a lag in network performance and issues the show interfaces fastethernet 0/0 command. Based on the output that is displayed, what two items should the administrator check next? (Choose two.)duplex settingscable lengthselectrical interferenceincorrect cable typesdamaged cable termination31The PT initialization was skipped. You will not be able to view the PT activity.Open the PT activity. Perform the tasks in the activity instructions and then answer the question.To verify that the SVI is configured correctly, answer this question: Which ping command completed successfully?ping 192.168.25.7ping 192.168.25.10ping 192.168.25.9ping 192.168.25.832An administrator created and applied an outbound Telnet extended ACL on a router to prevent router-initiated Telnet sessions. What is a consequence of this configuration?The ACL will work as desired as long as it is applied to the correct interface.The ACL will not work as desired because an outbound ACL cannot blockrouter-initiated traffic.The ACL will work as long as it will be applied to all vty lines.The ACL will not work because only standard ACLs can be applied to vty lines.33What is the effect of entering the network 192.168.10.1 0.0.0.0 area 0 command in router configuration mode?OSPF advertisements will include the specific IPv4 address 192.168.10.1.OSPF advertisements will include the network on the interface with the IPv4 address 192.168.10.1.This command will have no effect because it uses a quad zero wildcard mask.The interface with the IPv4 address 192.168.10.1 will be a passive interface.34Which type of static route typically uses the distance parameter in the ip route global configuration command?standard static routefloating static routedefault static routesummary static route35Which command would be best to use on an unused switch port if a company adheres to the best practices as recommended by Cisco?ip dhcp snoopingswitchport port-security mac-address stickyshutdownswitchport port-security violation shutdownswitchport port-security mac-address sticky mac-address36What is a disadvantage when both sides of a communication use PAT?The flexibility of connections to the Internet is reduced.Host IPv4 addressing is complicated.The security of the communication is negatively impacted.End-to-end IPv4 traceability is lost.37What is meant by the term “best match” when applied to the routing table lookup process?network matchsupernet matchexact matchlongest match38Place the options in the following order:hierarchicalmodularityresiliency– not scored –flexibility39Fill in the blank. Do not use abbreviations.The duplex full command configures a switch port to operate in the full-duplex mode. 40An administrator is trying to remove configurations from a switch. After using the command erase startup-config and reloading the switch, the administrator finds that VLANs 10 and 100 still exist on the switch. Why were these VLANs not removed?These VLANs are default VLANs that cannot be removed.Because these VLANs are stored in a file that is called vlan.dat that is located in flash memory, this file must be manually deleted.These VLANs can only be removed from the switch by using the no vlan 10 and no vlan 100 commands.These VLANs cannot be deleted unless the switch is in VTP client mode.41An administrator attempts to change the router ID on a router that is running OSPFv3 by changing the IPv4 address on the router loopback interface. Once the IPv4 address is changed, the administrator notes that the router ID did not change. What two actions can the administrator take so that the router will use the new IPv4 address as the router ID? (Choose two.)Copy the running configuration to NVRAM.Reboot the router.Disable and re-enable IPv4 routing.Shut down and re-enable the loopback interface.Clear the IPv6 OSPF process.42Refer to the exhibit. In the routing table entry, what is the administrative distance?2412212043Which two pieces of information are required when creating a standard access control list? (Choose two.)subnet mask and wildcard maskaccess list number between 100 and 199access list number between 1 and 99destination address and wildcard masksource address and wildcard mask44Refer to the exhibit. Inter-VLAN communication between VLAN 10, VLAN 20, and VLAN 30 is not successful. What is the problem?The access interfaces do not have IP addresses and each should be configured with an IP address.The switch interface FastEthernet0/1 is configured as an access interface and should be configured as a trunk interface.The switch interfaces FastEthernet0/2, FastEthernet0/3, and FastEthernet0/4 are configured to not negotiate and should be configured to negotiate.The switch interface FastEthernet0/1 is configured to not negotiate and should be configured to negotiate.45In a routing table which route can never be an ultimate route?parent routechild routelevel two routelevel one route46In which type of attack does a malicious node request all available IP addresses in the address pool of a DHCP server in order to prevent legitimate hosts from obtaining network access?DHCP snoopingMAC address floodingCAM table overflowDHCP starvation47Refer to the exhibit. What address will be used as the router ID for the OSPFv3 process?10.1.1.12001:DB8:ACAD:1::12001:DB8:CAFE:1::1192.168.1.11.1.1.148Refer to the exhibit. An administrator is trying to configure PAT on R1, but PC-A is unable to access the Internet. The administrator tries to ping a server on the Internet from PC-A and collects the debugs that are shown in the exhibit. Based on this output, what is most likely the cause of the problem?The NAT source access list matches the wrong address range.The inside and outside NAT interfaces have been configured backwards.The inside global address is not on the same subnet as the ISP.The address on Fa0/0 should be 64.100.0.1.49A college student is studying for the Cisco CCENT certification and is visualizing extended access lists. Which three keywords could immediately follow the keywords permit or deny as part of an extended access list? (Choose three.)wwwudptcpicmpftptelnet50When does a switch use frame filtering?The destination MAC address is for a host on a different network segment from the source of the traffic.The destination MAC address is for a host with no entry in the MAC address table.The destination MAC address is for a host on a network supported by a different router.The destination MAC address is for a host on the same network segment as the source of the traffic.。
CCNA认证基础课程-课后作业.习题答案
CCNA认证基础-习题分析讲义第一部分第一章1. Convert the binary number 10111010 into its hexadecimal equivalent. Select thecorrect answer from the list below. （3）1) 852) 903) BA4) A15) B36) 1C2. Convert the Hexadecimal number A2 into its Base 10 equivalent. Select thecorrect answer from the list below. （4）1) 1562) 1583) 1604) 1625) 1646) 1663. Which binary number is a representation of the decimal number 248? （3）1) 111010002) 111101003) 111110004) 111110104. Which of the following will test the internal loopback of a node? （3）1) ping 10.10.10.12) ping 192.168.1.13) ping 127.0.0.14) ping 223.223.223.2235) ping 255.255.255.2555. What can be verified by successfully pinging the reserved loopback address ona host? （2）1) Connectivity exists between two hosts on the LAN.2) The TCP/IP stack of the local host is configured correctly.3) A connection exists between a host and the default gateway.4) The route a packet takes from the local host to a remote host is valid.6. Which of the following commands could be used on a Windows-basedcomputer to view the current IP configuration of the system? (Choose two.) （3，4）1) configip2) ifconfig3) ipconfig4) winipcfg5) Winipconfig7.Refer to the exhibit. What must be configured on Host B to allow it to communicate withthe Host C? (Choose three.) （2，4，6）1)the MAC address of RTA router interface connected to Switch 12) a unique host IP address3)the IP address of Switch 14)the default gateway address5)the MAC address of Host C6)the subnet mask for the LAN8. What are important characteristics to consider when purchasing a networkinterface card? (Choose two.) （2，3）1) security used on the network2) media used on the network3) system bus used on the computer4) software installed on the network5) diagnostic tools installed on the network第二章1. Select the necessary information that is required to compute the estimated timeit would take to transfer data from one location to another. (Choose two.) （1，5）1) file size2) data format3) network in use4) type of medium5) bandwidth of the link2. Using the data transfer calculation T=S/BW, how long would it take a 4MB file tobe sent over a 1.5Mbps connection? （2）1) 52.2 seconds2) 21.3 seconds3) 6.4 seconds4) 2 seconds5) 0.075 seconds6) 0.0375 seconds3. What are features of the TCP/IP Transport layer? (Choose two.) （3，5）1) path determination2) handles representation, encoding and dialog control3) uses TCP and UDP protocols4) packet switching5) reliability, flow control and error correction4. Which of the following is the Layer 4 PDU? （4）1) bit2) frame3) packet4) Segment5. What is important to remember about the data link layer of the OSI model whenconsidering Peer to Peer communication? (Choose three.) （3，4，5）1) It links data to the transport layer.2) It encapsulates frames into packets.3) It provides a service to the network layer.4) It encapsulates the network layer information into a frame.5) Its header contains a physical address which is required to complete the datalink functions.6) It encodes the data link frame into a pattern of 1s and 0s (bits) for transmissionon the medium.6. Which statement describes a star topology? （2）1) Each host in the network is connected to a backbone cable that is terminated atboth ends.2) Each host is connected to a hub or switch, either of which acts as a central pointfor all network connections.3) Each host is directly connected to two other hosts to form a long chain of hosts.4) Each host has a connection to all other hosts in the network.7. Which statements describe the logical token-passing topology? (Choose two.)（2）1) Network usage is on a first come, first serve basis.2) Computers are allowed to transmit data only when they possess a token.3) Data from a host is received by all other hosts. Electronic tokens are passedsequentially to each other.4) Token passing networks have problems with high collision rates.8. Which technologies are considered to be LAN technologies? (Choose two.) （2，5）1) DSL2) Token Ring3) Frame Relay4) ISDN5) Ethernet9.Refer to the exhibit. Host A wants to send a message to host B. Place the following stepsin the correct order so that the message can be sent. （4）A - add network layer addressesB - transmit bitsC - create application dataD - add data link layer addresses1) B, A, D, C2) D, A, C, B3) A, D, A, B4) C, A, D, B5) C, D, A, B6) C, B, A, D10.After an uns u ccessful ping to the local router, the technician decides to investigate therouter. The technician observes that the lights and fan on the router are not operational.In which layer of the OSI model is the problem most likely occurring? （4）1) transport2) network3) data link4) physical11. Refer t o the exhibit. What is the order of the TCP/IP Protocol Data Units as datais moved as indicated through the OSI model? （3）1) data, segments, frames, packets, bits2) data, packets, segments, frames, bits3) data, segments, packets, frames, bits4) data, packets, frames, segments, bits第三章1. Which combinations of charges will be repelled by electric force? (Choose two.)（4，6）1) neutral and neutral2) neutral and positive3) neutral and negative4) positive and positive5) positive and negative6) negative and negative2. Which of the following are considered the best media for use in data networkcommunications? (Choose three.) （2，3，6）1) glass2) fibers3) copper4) gold5) plastic6) silicon7) Silver3. Which of the following wireless standards increased transmission capabilitiesto 11 Mbps? （2）1) 802.11a2) 802.11b3) 802.11c4) 802.11d4. What is attenuation? （3）1) opposition to the flow of current2) measurement of electrical signals relative to time3) degradation of a signal as it travels along the medium4) amount or volume of traffic that is flowing on the medium5. Which cable specifications are indicated by 10BASE-T? （3）1) 10 Mbps transmission speed, baseband signal, 500 meter cable length, coaxialcable2) 10 Mbps transmission speed, broadband signal, 100 meter cable length, coaxialcable3) 10 Mbps transmission speed, baseband signal, 100 meter cable length,twisted-pair cable4) 10 Gbps transmission speed, broadband signal, 500 meter cable length,twisted-pair cable6. For which Ethernet installations would fiber optic rather than Cat5 UTP be abetter media choice? (Choose two.) （2，4）1) a 3 meter connection between two 10BASE-T hubs2) an environment with many potential sources of EMI and RFI3) a peer to peer connection between two NICs with RJ45 connectors4) an installation between two buildings that are located 500 meters apart5) a single building installation where installation costs are the major concern7. Refer to the exhibit. Which type of UTP cable should be used to connect Host Ato Switch1? （4）1) rollover2) console3) crossover4) straight-through8. Refer to the exhibit. Which type of Category 5 cable is used to make an Ethernetconnection between Host A and Host B? （3）1) coax cable2) rollover cable3) crossover cable4) straight-through cable第四章1. During cable testing, which of the following are used to calculate theinformation carrying capacity of a data cable? (Choose two.) （2，5）1) bit speed2) attenuation3) wire map4) saturation limit5) analog bandwidth2. What type of wiring problem is depicted in this sample of a cable tester? （3）1) a fault2) a short3) an open4) a split a good map3. In a new network installation, the network administrator has decided to use amedium that is not affected by electrical noise. Which cable type will best meet this standard? （5）1) coaxial2) screened twisted pair3) shielded twisted pair4) unshielded twisted pair5) fiber optic4. How does network cable length affect attenuation? （3）1) Category 5 cable that is run in metal conduit has the highest attenuation in theshortest distance.2) Shorter cable lengths have greater signal attenuation.3) Longer cable lengths have greater signal attenuation.4) The length of the cable has no effect on signal attenuation.第五章1. The highest capacity Ethernet technologies should be implemented in whichareas of a network? (Choose three.) （3，4，5）1) between workstation and backbone switch2) between individual workstations3) between backbone switches4) between enterprise server and switch5) on aggregate access links2. What device must be used between an AUI port of a networking device and themedia to which it is being connected? （3）1) a transducer2) a transmitter3) a transceiver4) a transponder5) a port replicator3. An ISDN Basic Rate Interface (BRI) is composed of how many signalingchannels? （1）1) 12) 23) 34) 44. Which layer of the OSI model covers physical media? （1）1) Layer 12) Layer 23) Layer 34) Layer 45) Layer 56) Layer 65. What type of network cable is used between a terminal and a console port? （3）1) cross-over2) straight-through3) rollover4) patch cable6. What is the recommended maximum number of workstations configured on apeer-to-peer network? （3）1) 252) 153) 104) 55) 27. Which of the following increases the potential for a collision to occur? （4）1) the use of an active hub instead of an intelligent hub2) the use of an intelligent hub instead of an active hub3) a reduction in the number of devices attached to the hub4) an increase in the number of devices attached to the hub8. What is the maximum length of a media segment used for 100BASE-TX? （1）1) 100 meters2) 185 meters3) 400 meters4) 500 meters9. Which cable diagram displays the end to end pinout for a crossover cable usedwith Cisco devices? （3）1) Cable A2) Cable B3) Cable C4) Cable D第六章1. What does the "10" in 10Base2 indicate about this version of Ethernet? （2）1) The version uses Base10 numbering within the frames.2) The version operates at a transmission rate of 10 Mbps.3) Frames can travel 10 meters unrepeated.4) The maximum frame length is 10 octets.2. How is a MAC address represented? （4）1) four groups of eight binary digits separated by a decimal point2) four Base10 digits separated by a decimal point3) six hexadecimal digits4) twelve hexadecimal digits5) twenty-four Base10 digits3. Which of the following statements are correct about CSMA/CD? (Choose three.)（1，3，6）1) It is a media access method used in LANs.2) It is a media access method used in FDDI WANs.3) When a device needs to transmit, it checks to see if the media is available.4) A device sends data without checking media availability because all deviceshave equal access.5) Multiple devices can successfully transmit simultaneously.6) Only one device can successfully transmit at a time.4. Which devices shown in the graphic must have a MAC address? （5）1) only PC2) only router3) PC and router4) PC, hub, and router5) PC, printer, and router第七章1. Which of the following items are common to all 100BASE technologies?(Choose three.) （1，4，5）1) frame format2) media3) connectors4) timing5) multi-part encoding2. Which of the following does 1000BASE-T use to accomplish gigabit speeds onCat 5e cable? （4）1) the use of four conductors in full-duplex mode2) the use of two multiplexed pairs of wires, simultaneously3) the use of three pairs of wires for data and the fourth for stabilization andforward error correction4) the use of all four pairs of wires in full-duplex mode, simultaneously3. For which of the following is Ethernet considered the standard? (Choose three.)（1，4，5）1) inter-building connection2) mid-length voice3) video conferencing4) vertical wiring5) horizontal wiring6) diagonal wiring4. To make sure timing limitations are not violated when implementing a 10 MbpsEthernet network involving hubs or repeaters, a technician should adhere to which rule? （4）1) the 4-5-3 rule2) the 6-4-2 rule3) the 3-4-5 rule4) the 5-4-3 rule5. What is the maximum distance that 10BASE-T will transmit data before signalattenuation affects the data delivery? （1）1) 100 meters2) 185 meters3) 300 meters4) 500 meters6. When using Category 5 UTP cable, which RJ-45 pin pairs are used to exchangedata between hosts on an Ethernet network? （2）1) 1 and 2; 4 and 52) 1 and 2; 3 and 63) 3 and 6; 7 and 84) 4 and 5; 7 and 8第八章1. John has been hired as the network administrator of a local company and hasdecided to add more hubs to the company's existing network. Which of the following has been caused by John's inexperience? （1）1) collision domain extended2) an increased number of collision domains3) increased network performance4) increased bandwidth5) extended bandwidth2. "CompA" is trying to locate a new computer named "CompB" on the network.Which of the following does "CompA" broadcast to find the MAC address of "CompB"? （2）1) MAC request2) ARP request3) ping4) Telnet5) proxy ARP3. Which of the following is a term associated with replacing hubs with switchesto increase the number of collision domains? （3）1) encapsulation2) latency3) segmentation4) layered model5) broadcast domain6) Extended4. The accumulation of traffic from which of the following can cause a networkcondition called broadcast radiation? (Choose three.) （3，5，6）1) anonymous FTP servers2) telnet sessions3) video over IP applications4) NAS services5) ARP requests6) RIP updates5. Which of the following describes the use of Spanning Tree Protocol (STP)? （4）1) resolve routing loops2) eliminate Split Horizon errors3) limit collisions4) resolve switching loops6. Which term describes the delay in time that occurs when a frame leaves itssource device and reaches its destination? （4）1) collision2) backoff3) attenuation4) latency5) broadcast7. Based on the graphic above, which of the following occurs as each host systemcomes on line in the topology? （2）1) The switch sends its MAC address to each host.2) The switch adds MAC address to the bridge table as each host sends a frame.3) Each host exchanges MAC addresses with each other.4) The switch listens for data traffic to block since the switch lacks an IP address. 8. Which devices segment collision domains? (Choose two.) （2，3）1) transceiver2) router3) switch4) hub5) media9. Which protocol is used to eliminate switching loops? （3）1) Transmission Control Protocol2) Routing Information Protocol3) Spanning Tree Protocol4) Interior Gateway Routing Protocol5) Internetworking Protocol10. Refer to the exhibit. A network associate needs to establish an Ethernetconnection between Host A and Host B. However, the distance between the two hosts is further than the cabling standards allow. Which two devices that operate at the physical layer of the OSI can be used to allow Host A and Host B to communicate? （2，5）1) switch2) hub3) bridge4) router5) repeater第九章1. Which term describes an ARP response by a router on behalf of a requestinghost? （3）1) ARP2) RARP3) Proxy ARP4) Proxy RARP2. Which protocol functions at the internet layer of the TCP/IP protocol suite? （4）1) File Transfer Protocol (FTP)2) Trivial File Transfer Protocol (TFTP)3) Transmission Control Protocol (TCP)4) Internet Protocol (IP)5) User Datagram Protocol (UDP)6) Simple Mail Transport Protocol (SMTP)3. Which of these workstation installation and setup tasks are concerned withnetwork access layer functions? (Choose two.) （2，4）1) configuring the e-mail client2) installing NIC drivers3) configuring IP network settings4) connecting the network cable5) using FTP to download application software updates4. Which part of an IP address identifies a specific device on a network? （4）1) first two octets2) third and fourth octets3) network portion4) host portion5) only the fourth octet5. Which of the following are features of the Internet Protocol (IP)? (Choose two.)（1，3）1) It is the most widely implemented global addressing scheme.2) It allows two hosts to share a single address on a local area network.3) It is a hierarchical addressing scheme allowing addresses to be grouped.4) It is only locally significant, used primarily on local area networks.6. Which of the following are useable Class A IP addresses with a default subnetmask? (Choose three.) （2，3，5）1) 127.0.39.12) 111.9.28.303) 123.1.2.1324) 128.50.38.25) 105.1.34.16) 0.23.92.37. Which application layer protocols use UDP at the transport layer? (Choose two.)（2，4）1) FTP2) SNMP3) Telnet4) DHCP5) SMTP第十章1. Which OSI layer encapsulates data into packets? （3）1) session2) transport3) network4) data link2. Which OSI layer defines the functions of a router? （3）1) physical2) data link3) network4) transport5) session3. Which of the following are Cisco proprietary routing protocols? (Choose two.)（2，6）1) RIPv22) IGRP3) OSPF4) BGP5) RIPv16) EIGRP4. A company with a Class B license needs to have a minimum of 1,000 subnetswith each subnet capable of accommodating 50 hosts. Which mask below is the appropriate one? （4）1) 255.255.0.02) 255.255.240.03) 255.255.255.04) 255.255.255.1925) 255.255.255.2245. A small company has a class C network license and needs to create five usablesubnets, each subnet capable of accommodating at least 20 hosts. Which of the following is the appropriate subnet mask? （3）1) 255.255.255.02) 255.255.255.1923) 255.255.255.2244) 255.255.255.2406. When a network administrator applies the subnet mask 255.255.255.248 to aClass A address, for any given subnet, how many IP addresses are available to be assigned to devices? （6）1) 10222) 5103) 2544) 1265) 306) 67. Host A is assigned the IP address 10.18.97.55 /21. How many more networkdevices can be assigned to this subnetwork if Host A is the only one that has an IP address assigned so far? （4）1) 2542) 5093) 10214) 20455) 40946) 81908.Refe r to the exhibit. The network administrator wants to create a subnet for thepoint-to-point connection between the two routers. Which subnetwork mask would provide enough addresses for the point-to-point link with the least number of wasted addresses?1) 255.255.255.1922) 255.255.255.2243) 255.255.255.2404) 255.255.255.2485) 255.255.255.2529. What is the correct number of usable subnetworks and hosts for the IP networkaddress 192.168.35.0 subnetted with a /28 mask?1) 6 networks / 64 hosts2) 14 networks / 32 hosts3) 14 networks / 14 hosts4) 30 networks / 64 hosts10. Which subnet masks would be valid for a subnetted Class B address? (Choosetwo.) （5，6）1) 255.0.0.02) 255.254.0.03) 255.224.0.04) 255.255.0.05) 255.255.252.06) 255.255.255.19211. Refer to the exhibit. How will the Fohi router dynamically learn routes to the192.168.16.16/28, 192.168.16.32/28, and 192.168.16.48/28 subnetworks? （3）1) with a static route2) with a routed protocol3) with a routing protocol4) with a directly connected route12. How many broadcast domains are shown in the diagram? （1）1) three2) four3) five4) six5) seven6) eight13. How many collision domains are shown in the diagram? （5）1) three2) four3) five4) six5) seven6) eight14. A router interface has been assigned an IP address of 172.16.192.166 with amask of 255.255.255.248. To which subnet does the IP address belong?1) 172.16.0.02) 172.16.192.03) 172.16.192.1284) 172.16.192.1605) 172.16.192.1686) 172.16.192.17615. Refer to the exhibit. Host A is sending data to Host B. Once R2 determines thatdata from Host A must be forwarded to R1 to reach Host B, which layer of the OSI model will R2 use to address and build the frames destined for R1?1) physical2) data link3) network4) transport5) session6) presentation16. Which type of address is 192.168.170.112/28?1) host address2) subnetwork address3) broadcast address4) multicast address17. Which type of address is 223.168.17.167/29?1) host address2) multicast address3) broadcast address4) subnetwork address18. Which combination of network id and subnet mask correctly identifies all IPaddresses from 172.16.128.0 through 172.16.159.255?1) 172.16.128.0 255.255.255.2242) 172.16.128.0 255.255.0.03) 172.16.128.0 255.255.192.04) 172.16.128.0 255.255.224.05) 172.16.128.0 255.255.255.19219. Refer to the exhibit. The internetwork in the exhibit has been assigned the IPaddress 172.20.0.0. What would be the appropriate subnet mask to maximize the number of networks available for future growth?1) 255.255.224.02) 255.255.240.03) 255.255.248.04) 255.255.252.05) 255.255.254.06) 255.255.255.0第十一章1. If a network administrator needed to download files from a remote server, whichprotocols could the administrator use to remotely access those files? (Choose two.) （3，5）1) NFS2) ASCII3) TFTP4) IMAP5) FTP6) UDP2. What is established during a connection-oriented file transfer betweencomputers? (Choose two.) （2，5）1) a temporary connection to establish authentication of hosts2) a connection used for ASCII or binary mode data transfer3) a connection used to provide the tunnel through which file headers aretransported4) a command connection which allows the transfer of multiple commands directlyto the remote server system5) a control connection between the client and server3. Which of the following protocols are used for e-mail transfer between clientsand servers? (Choose three.) （3，4，5）1) TFTP2) SNMP3) POP34) SMTP5) IMAP46) postoffice4. Which type of institution does the domain suffix .org represent? （4）1) government2) education3) network4) non-profit5. Which of the following services is used to translate a web address into an IPaddress? （1）1) DNS2) WINS3) DHCP4) Telnet6. Which part of the URL http://www.awsb.ca/teacher gives the name of thedomain? （4）1) www2) http://3) /teacher4) awsb.ca7. Which protocols are TCP/IP application layer protocols? (Choose two.) （2，4）1) UDP2) FTP3) IP4) SMTP5) TCP8. What are three characteristics of the TCP protocol? (Choose three.) （3，4，6）1) has less overhead than UDP2) is used for IP error messages3) forces the retransmission undelivered packets4) creates a virtual session between end-user applications5) carries the IP address of destination host in the TCP header6) is responsible for breaking messages into segments and reassembling9. Two peer hosts are exchanging data using TFTP. During the current session, adatagram fails to arrive at the destination. Which statement is true regarding the retransmission of the datagram? （2）1) Datagram retransmission requires user authentication.2) Datagram retransmission is controlled by the application.3) Datagram retransmission relies on the acknowledgements at transport layer.4) Datagram retransmission occurs when the retransmission timer expires in thesource host.案例学习1. 子网计算练习：Answer2. 子网号及广播地址计算练习Answer3. 子网规划练习：已知：给定一个C类地址201.16.5.0/24。
ccna2答案第五章
第五章 RIPv1 CCNA2 Exploration: 路由协议和概念 (2010-12-15 18:07:13) 转载▼标签： 杂谈 分类： 2010｜CCNA2官方试题--路由 1窗体顶端ERouting Chapter 7 - CCNA Exploration: 路由协议和概念 (版本 4.0)以下行显示在 show ip route 命令的输出中。
R 192.168.3.0/24 [120/3] via 192.168.2.2, 00:00:30, Serial0/0该路由度量的值是什么？3122030120 窗体底端2窗体顶端下列关于 RIPv1 特性的陈述中，哪两项是正确的？（选择两项。
）它是一种距离矢量路由协议。
它会在路由更新中通告路由的地址和子网掩码。
RIP 消息的数据部分封装在 TCP 数据段中。
RIP 消息的数据部分封装在 UDP 数据段中。
它每 15 秒广播一次更新。
它最多允许路由域中存在 15 台路由器。
窗体底端3窗体顶端请参见图示。
图中所示的网络运行RIPv1。
不久前其中添加了192.168.10.0/24 网络，该网络将只包含最终要防止向新网络中的最终用户设备发送RIPv1 更新，同时允许将此新网络通告给其它路由器，应该在Rou 什么命令？Router1(config-router)# no router ripRouter1(config-router)# network 192.168.10.0Router1(config-router)# no network 192.168.10.0Router1(config-router)# passive-interface fastethernet 0/0Router1(config-router)# passive-interface serial 0/0/0窗体底端4 窗体顶端请参见图示。
该网络包含多台路由器。
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c c n a2答案第五章第五章 RIPv1 CCNA2 Exploration: 路由协议和概念 (2010-12-15 18:07:13) 转载▼标签： 杂谈 分类： 2010｜CCNA2官方试题--路由 1 窗体顶端ERouting Chapter 7 - CCNA Exploration: 路由协议和概念 (版本 4.0)以下行显示在 show ip route 命令的输出中。
R 192.168.3.0/24 [120/3] via 192.168.2.2, 00:00:30, Serial0/0该路由度量的值是什么？3122030120 窗体底端2 窗体顶端下列关于RIPv1 特性的陈述中，哪两项是正确的？（选择两项。
）它是一种距离矢量路由协议。
它会在路由更新中通告路由的地址和子网掩码。
RIP 消息的数据部分封装在 TCP 数据段中。
RIP 消息的数据部分封装在 UDP 数据段中。
它每 15 秒广播一次更新。
它最多允许路由域中存在 15 台路由器。
窗体底端3 窗体顶端请参见图示。
图中所示的网络运行 RIPv1。
不久前其中添加了 192.168.10.0/24 网络，该网络将终用户。
如果要防止向新网络中的最终用户设备发送 RIPv1 更新，同时允许将此新网络通告给器，应该在 Router1 上输入什么命令？Router1(config-router)# no router ripRouter1(config-router)# no network 192.168.10.0Router1(config-router)# passive-interface fastethernet 0/0Router1(config-router)# passive-interface serial 0/0/04 窗体顶端请参见图示。
该网络包含多台路由器。
在网络中某台路由器上使用 show ip protocols 命令可以内容？网络中的所有路由是否都已正确地添加到路由表中此路由器上使用的 IP 路由协议配置网络中所有路由器上所使用的路由协议的运行状况路由表中列出的每个网络的路由度量窗体底端5 窗体顶端以下哪项是 RIP v1 的局限性？RIP v1 在更新中不会发送子网掩码信息。
许多网络硬件厂商不支持 RIP v1。
RIP v1 使用 D 类地址多播路由更新，消耗了过多的带宽。
RIP v1 需要性能较高的路由器处理器和大量 RAM 才能有效运作。
RIP v1 不支持在等价路径上实现负载均衡。
RIP v1 验证很复杂，配置也很麻烦。
6 窗体顶端下列哪三项是 RIPv1 路由协议的特征？（选择三项。
）支持使用 VLSM使用跳数作为度量将 16 视为无穷度量默认管理距离为 110路由更新中包含目的 IP 地址和子网掩码使用贝尔曼-福特算法计算度量7 窗体顶端在 RIPv1 配置中，如果为 network 命令地址部分输入的是接口 IP 地址而不是网络地址，将会发况？路由器将拒绝执行该命令。
传出的 RIP 更新中将添加指向该主机地址的路由。
路由表中将添加指向该主机地址的路由。
与所配置地址处于相同有类网络内的所有接口都将参与 RIPv1 路由过程。
8 窗体顶端请参见图示。
Router1 和 Router2 正运行 RIPv1 协议。
网络管理员在 Router1 上配置了命令 netw10.1.0.0。
Router1 将向 Router2 通告下列哪个网络？10.1.0.0/1610.1.0.0/810.0.0.0/1610.0.0.0/89 窗体顶端哪一条（或一组）命令可以停止 RIP 路由过程？RouterB(config)# router ripRouterB(config)# router ripRouterB(config)# no router ripRouterB(config)# router no rip10 窗体顶端请参见图示。
Router1 正运行 RIPv1。
应该向 Router1 输入什么命令以配置“最后选用网关”？no auto-summaryip default-network 0.0.0.0ip default-gateway 10.0.0.0ip route 0.0.0.0 0.0.0.0 S0/0/111 窗体顶端哪一条命令可显示路由器上发生的 RIP 活动？debug ip ripshow ip routeshow ip interfaceshow ip protocolsdebug ip rip configshow ip rip database窗体底端12 窗体顶端请参见图示。
图中所示的所有路由器都运行 RIP 路由协议。
所有未知的 IP 流量必须转发到 IS 此转发策略，最好在哪台路由器或哪一组路由器上配置默认路由并使用 default-information orig 令？仅 Router1仅网关路由器网络中的所有路由器仅在其 LAN 需要 Internet 接入的路由器上13 窗体顶端观察 show ip route 命令的输出。
根据此路由器命令的输出，我们可以得出什么结论？尚未设置与目的地之间的首选路由。
有两条等价路径可以到达网络 1.0.0.0。
两个接口被同等地用于路由流量。
必须设置一个差量，以便在多条路径上实现负载均衡。
14 窗体顶端请参见图示。
Router2 的以太网接口断开，但管理员发现经过该接口的路由在 Router1 的路由表效。
还需要多久 Router1 才会将该路由的度量设置为 16，从而将其标记为无效路由？30 秒90 秒155 秒180 秒255 秒窗体底端15 窗体顶端请参见图示。
图示中的所有路由器都运行 RIP v1。
网络管理员在路由器 A 上发出 show ip route 网络达到收敛，路由表中应该出现什么路由？（选择两项。
）R 192.168.2.0/24 [120/1]C 192.168.2.0/24 [120/1]R 10.10.3.0/24 [120/0]C 10.10.3.0/24 [120/1]R 10.10.1.0/24 [120/2]R 10.10.1.0/24 [120/3]窗体底端16 窗体顶端要在路由器 B 上为所有相连网络启用 RIP，正确的命令是怎样的？RouterB# router ripRouterB(router)# network 220.17.29.0RouterB(router)# network 211.168.74.0RouterB(config)# router ripRouterB(config-router)# network 211.168.74.0RouterB(config-router)# network 199.84.32.0RouterB(config)# configure router ripRouterB(config-router)# network 199.84.32.0RouterB(config-router)# network 211.168.74.0RouterB(config)# router ripRouterB(config-router)# network 210.36.7.0RouterB(config-router)# network 211.168.74.0RouterB(config)# router ripRouterB(config-router)# network 210.36.7.0RouterB(config-router)# network 220.17.29.0窗体底端17 窗体顶端RIP 路由协议默认多少秒发送一次更新？10121520306018 窗体顶端请参见图示。
所有路由器都配置了指定网络中的有效接口地址，而且这些路由器都运行 RIP 已达到收敛。
路由表中目前有哪些路由？所有路由器的路由表中都包含所有路由。
所有路由器的路由表中都有 /30 路由，但没有 /24 路由。
所有路由器都包含 /30 路由。
路由器 A 和 E 的路由表中还包含一些 /24 路由。
所有路由器都包含 /30 路由。
路由器 B 和 D 的路由表中还包含一些 /24 路由。
路由器 A 和 E 中包含所有路由。
路由器 B 和 D 的路由表中仅包含 /30 路由。
路由器 A 和 E 中仅包含 /24 路由。
路由器 B 和 D 的路由表中仅包含 /30 路由。
19 窗体顶端请参见图示。
从路由器 B 的路由表输出中可以得出什么结论？路由器 B 上已经配置了静态默认路由。
路由器 A 上已经输入了 default-information originate 命令。
所有目的地为 192.168.1.1 的流量都将发送到地址 0.0.0.0。
10.16.1.0/27 网络上的主机均使用 192.168.1.1 作为默认网关地址。
Array窗体底端。