【正文】 st by DHCP is (應(yīng)用到由 DHCP 主機(jī)的網(wǎng)絡(luò)默認(rèn)網(wǎng)關(guān)是 \/28。s IP stack by pinging the loopback address. Which address would you ping to perform this task?{網(wǎng)絡(luò)管理員已要求您通過(guò) ping 環(huán)回地址檢查工作站的 IP 堆棧的狀態(tài)。ping 。B 工作站已分配 IP 地址為 \/28。在主機(jī)之間 ping 不成功。}A. Replace the straightthrough cable with a crossover cable.B. Change the subnet mask of the hosts to /25.C. Change the subnet mask of the hosts to /26.D. Change the address of Workstation A to .E. Change the address of Workstation B to .Answer: ABSection: Chapter 3: IP Addressing and VLSMExplanation/Reference:考點(diǎn)：同構(gòu)設(shè)備使用交叉線，兩端的IP需要在同一個(gè)子網(wǎng)。正確。C：修改掩碼為26為，錯(cuò)誤。D/E：錯(cuò)誤，都不能使他們?cè)谕粋€(gè)子網(wǎng)。s interface. They have also given you the default gateway address of . After you have configured the address, the router is unable to ping any remote devices. What is preventing the router from pinging remote devices?(您的 ISP 給你要分配給您的路由器接口地址 \/29。您已配置了地址后，路由器是無(wú)法 ping 任何遠(yuǎn)程設(shè)備。：A：默認(rèn)網(wǎng)關(guān)不屬于這個(gè)子網(wǎng)，錯(cuò)誤B：默認(rèn)網(wǎng)關(guān)是這個(gè)子網(wǎng)的廣播地址，正確C：這個(gè)地址是子網(wǎng)的廣播地址，錯(cuò)誤D：這個(gè)地址是組播地址，錯(cuò)誤。QUESTION 18Which mand displays CPU utilization?{哪個(gè)命令顯示的 CPU 利用率呢？}A. show protocolsB. show processC. show systemD. show versionAnswer: BSection: Chapter 5: Managing Cisco IOSExplanation/Reference:查看CPU利用率。QUESTION 21A pany implements video conferencing over IP on their Ethernet LAN. The users notice that the network slows down, and the video either stutters or fails pletely. What is the most likely reason for this?{公司對(duì)他們的以太網(wǎng) LAN ip 實(shí)現(xiàn)視頻會(huì)議。最有可能的原因是什么？}A. minimum cell rate (MCR)B. quality of service (QoS)C. modulationD. packet switching exchange (PSE)E. reliable transport protocol (RTP)Answer: BSection: Chapter 9: SwitchingExplanation/Reference:考點(diǎn)：當(dāng)網(wǎng)絡(luò)中使用視頻會(huì)議后發(fā)現(xiàn)網(wǎng)絡(luò)非常慢，什么原因引起的？QoS：用于定制策略對(duì)不同流量進(jìn)行控制。不保持在 OSI 參考模型的傳輸層所要求的服務(wù)質(zhì)量。QUESTION 24Which protocols are found in the network layer of the OSI reference model and are responsible for path determination and traffic switching?{哪些協(xié)議在網(wǎng)絡(luò)層 OSI 參考模型中找到，負(fù)責(zé)路徑測(cè)定和交通切換？}A. LANB. routingC. WAND. networkAnswer: BSection: Chapter 1: IntroductionExplanation/Reference:OSI網(wǎng)絡(luò)層中什么提供了路徑選擇和流量轉(zhuǎn)發(fā)？由路由協(xié)議提供。QUESTION 25Which mand reveals the last method used to powercycle a router?A. show reloadB. show bootC. show runningconfigD. show versionAnswer: DSection: Chapter 5: Managing Cisco IOSExplanation/Reference:哪一個(gè)命令可以顯示最近一次被用來(lái)重啟路由器的方法？QUESTION 26Which three options are valid WAN connectivity methods? (Choose three.)A. PPPB. WAPC. HDLCD. MPLSE. L2TPv3F. ATMAnswer: ACFSection: Chapter 14: Wide Area Network (WAN)Explanation/Reference:哪三種封裝屬于WAN鏈路的?A:點(diǎn)到點(diǎn)協(xié)議，正確B：無(wú)線加密技術(shù)，錯(cuò)誤C:思科缺省封裝格式，正確。QUESTION 27Refer to the exhibit. Which WAN protocol is being used?A. ATMB. HDLCC. Frame RelayD. PPPAnswer: CSection: Chapter 14: Wide Area Network (WAN)Explanation/Reference:由圖中的紅線可看到發(fā)送接受LMI信息。QUESTION 28What is the difference between a CSU/DSU and a modem?【一個(gè)CSU/DSU和調(diào)制解調(diào)器之間的區(qū)別是什么？】A. A CSU/DSU converts analog signals from a router to a leased line。 a modem converts digital signals from a router to a leased line.C. A CSU/DSU converts digital signals from a router to a phone line。 a modem converts digital signals from a router to a phone line.Answer: DSection: Chapter 14: Wide Area Network (WAN)Explanation/Reference:CSU/DSU一般是專(zhuān)線，MODEN是將模擬信號(hào)與數(shù)字信號(hào)轉(zhuǎn)換QUESTION 29A network administrator must configure 200 switch ports to accept traffic from only the currently attached host devices. What would be the most efficient way to configure MAClevel security on all these ports?A. Visually verify the MAC addresses and then telnet to the switches to enter the switchportport security macaddress mand.B. Have end users their MAC addresses. Telnet to the switch to enter the switchportport security macaddress mand.C. Use the switchport portsecurity MAC address sticky mand on all the switch ports that have end devices connected to them.[有端設(shè)備連接到他們的所有交換機(jī)端口上使用交換機(jī)端口端口安全 MAC 地址粘滯命令。錯(cuò)誤，工作量太大B：用戶(hù)發(fā)送郵件認(rèn)證再在交換機(jī)上配置，錯(cuò)誤，不科學(xué)。D：錯(cuò)誤，工作量太大。QUESTION 32What are two characteristics of Frame Relay pointtopoint subinterfaces? (Choose two.)A. They create splithorizon issues.B. They require a unique subnet within a routing domain.C. They emulate leased lines.D. They are ideal for fullmesh topologies.E. They require the use of NBMA options when using OSPF.Answer: BCSection: Chapter 14: Wide Area Network (WAN)Explanation/Reference:幀中繼點(diǎn)到點(diǎn)子接口的特點(diǎn)？A：水平分割，錯(cuò)誤。C：類(lèi)似專(zhuān)線，正確。通常是hubspokeE：NBMA不支持OSPF，錯(cuò)誤。允許的范圍是通過(guò)ACL定義的。C：查看NAT轉(zhuǎn)換表，錯(cuò)誤。錯(cuò)誤QUESTION 34A wireless client cannot connect to an [一臺(tái)帶有b/。這種情況是什么原因？]A. The incorrect channel is configured on the client.B. The client39。這通常是SSID信號(hào)沒(méi)有配置正確。錯(cuò)誤B：客戶(hù)端的IP地址配置錯(cuò)誤C：客戶(hù)端的共享key錯(cuò)誤。QUESTION 35Which two features did WPAv1 add to address the inherent weaknesses found in WEP? (Choose two.)[哪兩個(gè)功能 WPAv1 沒(méi)有添加地址找到 wep 的固有弱點(diǎn)？（選擇兩個(gè)]A. a stronger encryption algorithmB. key mixing using temporal keysC. shared key authenticationD. a shorter initialization vectorE. per frame sequence countersAnswer: BESection: Chapter 11: WirelessExplanation/Reference:考點(diǎn)：WPA1中增強(qiáng)哪兩個(gè)在WEP中發(fā)現(xiàn)的弱點(diǎn)？WEP存在的隱患主要是依賴(lài)共享密鑰A：更強(qiáng)的加密算法B：混合使用的密鑰C：共享密鑰認(rèn)證D：較短的初始化向量E：一個(gè)幀一個(gè)序列計(jì)數(shù)器。QUESTION 38Which two Ethernet fiberoptic modes support distances of greater than 550 meters?A. 1000BASECXB. 100BASEFXC. 1000BASELXD. 1000BASESXE. 1000BASEZXAnswer: CESection: Chapter 1: IntroductionExplanation/Reference:A：最長(zhǎng)距離25米B：最長(zhǎng)距離100米C：最長(zhǎng)距離3000米D：最長(zhǎng)距離550米E：最長(zhǎng)距離70千米QUESTION 39What two things will a router do when running a distance vector routing protocol? (Choose two.)A. Send periodic updates regardless of topology changes.B. Send entire routing table to all routers in the routing domain.C. Use the shortestpath algorithm to the determine best path.D. Update the routing table based on updates from their neighbors.E. Maintain the topology of the entire network in its database.Answer: ADSection: Chapter 6: IP RoutingExplanation/