【正文】 of the following statements are true regarding bridges and switches? (Choose 3.) A. Switches are primarily software based while bridges are hardware based. B. Both bridges and switches forward Layer 2 broadcasts. C. Bridges are frequently faster than switches. D. Switches have a higher number of ports than most bridges. E. Bridges define broadcast domains while switches define col。所以，host （）的地址。因為只有相同vlan中數(shù)據(jù)才可以通訊，所以我們應該將host A的地址和f0/，而將host B的地址和f0/。 to the exhibit. A network administrator is adding two new hosts to SwitchA. Which three values could be used for the configuration of these hosts? (Choose three.) A. host 1 IP address: B. host 1 IP address: C. host 1 default gateway: D. host 2 IP address: E. host 2 default gateway: F. host 2 IP address: Answer: ACF解釋一下：我們可以看路由器上的子接口的配置：接口fa0/ 并被劃分到vlan 10中，接口fa0/ 20中了。他只能在一個單獨的區(qū)域中使用，如果一個使用私有地址的設備需要同外網通訊，可以通過NAT將這個私有地址轉換為公有地址，這樣也可以達到隱藏地址的目的。因為我到一個目的地從一條路走就可以了，如果出現(xiàn)了多條路，那么就應該是做冗余的，可是不正確的配置可能導致我的LAN中產生環(huán)路，從而形成在LAN中有同一個幀的多個拷貝。在一般來說我們的每個單播幀都是只有一個目的地，從而從一個相關接口發(fā)送出去就可。這樣看，答案就很明顯了。4．如果flash中沒有有效的IOS鏡像，引導程序將生成一個TFTP本地廣播以定位TFTP服務器。所以這步跳過。2．在NVRAM的配置文件中查看boot system命令，這個命令告訴引導程序在哪里尋找IOS。62. There are no boot system mands in a router configuration in NVRAM. What is the fallback sequence that the router will use to find an IOS during reload? A. TFTP server, Flash, NVRAM B. ROM, NVRAM, TFTP server C. NVRAM, TFTP server, ROM D. Flash, TFTP server, ROM E. Flash, NVRAM, ROM Answer: D解釋一下：這個問的是路由器尋找IOS的過程。要注意路由器只是能阻斷廣播，讓他不能從一個域中傳播到另一個域中，他是沒辦法消除廣播的。路由器是工作在三層的設備，因此我們可以基于三層的信息來實現(xiàn)過濾；而且大家知道路由器是可以過濾廣播的。同樣內網要訪問外部，也只能通過路由器InternetRouter才能到達，所以也可以在CentralRouter上配置一條缺省路由到外部。在一臺PC上能ping 。而我們阻斷二層環(huán)路是通過生成樹來實現(xiàn)的，在圖中有環(huán)路存在因此就說明沒有運行生成樹了。當ARP報文傳到switch 2，交換機對廣播的流量是以泛洪的形式處理的，報文就從除了連接PC1的接口外的所有接口都發(fā)出去了。53. What is the function of the Cisco IOS mand ip nat inside source static ? A. It creates a global address pool for all outside NAT transactions. B. It establishes a dynamic address pool for an inside static address. C. It creates dynamic source translations for all inside local PAT transactions. D. It creates a onetoone mapping between an inside local address and an inside global address. E. It maps one inside source address to a range of outside global addresses. Answer: D解釋一下：ip nat inside source static 這條命令是靜態(tài)創(chuàng)建一個一對一的地址轉換。而ip dlci 100表示的是DLCI 。52. Refer to the exhibit. What is the meaning of the term dynamic as displayed in the output of the show framerelay map mand shown? A. The Serial0/0 interface is passing traffic. B. The DLCI 100 was dynamically allocated by the router. C. The Serial0/0 interface acquired the IP address of from a DHCP server. D. The DLCI 100 will be dynamically changed as required to adapt to changes in the Frame Relay cloud. E. The mapping between DLCI 100 and the end station IP address was learned through Inverse ARP. Answer: E解釋一下：這是個關于MAP的知識。51. What can a network administrator utilize by using PPP Layer 2 encapsulation? (Choose three.) A. VLAN support B. pression C. authentication D. sliding windows E. multilink support F. quality of service Answer: BCE解釋一下：PPP協(xié)議是能支持認證的，包括PAP和CHAP；PPP還支持壓縮功能和差錯校驗，還可實現(xiàn)多鏈路捆綁。在OSPF中，RID的選舉過程是這樣的：如果通過命令routerid 來指定一個RID，那么就采用手工指定的這個RID；如果沒有手工指定，則在可以使用的接口中來選舉，他是優(yōu)先采用回環(huán)口的，如果只有一個回環(huán)口，就采用這個回環(huán)口的IP作為RID，如果有多個回環(huán)口，就采用這多個回環(huán)口中IP地址最大的作為RID；如果沒有回環(huán)口，就采用物理接口中IP地址最大的接口IP作為RID。RIPv2是可以關閉自動匯總的，而在RIPv1中是不能關閉的。RIPv1是以廣播的形式發(fā)送更新的，在RIPv2中采用的是廣播。46. Which three statements are correct about RIP version 2? (Choose three.) A. It has the same maximum hop count as version 1. B. It uses broadcasts for its routing updates. C. It is a classless routing protocol. D. It has a lower default administrative distance than RIP version 1. E. It supports authentication. F. It does not send the subnet mask in updates. Answer: ACE解釋一下：關于RIPv2，首先要了解他是一個無類的路由協(xié)議，在發(fā)送路由更新的時候是攜帶掩碼的。所以需要在交換機上指定一個處于VLAN 2的接口，并將SVI地址配置為和路由器POP的f0/。在這條命令后沒有指定管理距離，就表示使用默認的管理距離，為1.45. The network shown in the diagram is experiencing connectivity problems. Which of the following will correct the problems? (Choose two.) A. Configure the gateway on Host A as . B. Configure the gateway on Host B as . C. Configure the IP address of Host A as . D. Configure the IP address of Host B as . E. Configure the masks on both hosts to be . F. Configure the masks on both hosts to be . Answer: BD解釋一下：主機A到他的指定網關的這條鏈路是沒有問題的，因為HOST A，接口VLAN1和路由器的f0/，且都是處于VLAN 1的。43. Refer to the exhibit. The FMJ manufacturing pany is concerned about unauthorized access to the Payroll Server. The Accounting1, CEO, Mgr1, and Mgr2 workstations should be the only puters with access to the Payroll Server. What two technologies should be implemented to help prevent unauthorized access to the server? (Choose two.) A. access lists B. encrypted router passwords C. STP D. VLANs E. VTP F. wireless LANs Answer: AD解釋一下：需要控制只允許哪些組可以訪問服務器，組中的哪些用戶可以訪問，使用的技術當然有ACL和VLAN了。42. Which of the following describe the process identifier that is used to run OSPF on a router? (Choose two.) A. It is locally significant. B. It is globally significant. C. It is needed to identify a unique instance of an OSPF database. D. It is an optional parameter required only if multiple OSPF processes are running on the router. E. All routers in the same OSPF area must have the same process ID if they are to exchange routing information. Answer: AC解釋一下：OSPF的進程號只在本地有效。40. Refer to the exhibit. The network shown in the exhibit is running the RIPv2 routing protocol. The network has converged, and the routers in this network are functioning properly. The FastEthernet0/0 interface on R1 goes down. In which two ways will the routers in this network respond to this change? (Choose two.) A. All routers will reference their topology database to determine if any backup routes to the network are known. B. Routers R2 and R3 mark the route as inaccessible and will not accept any fu