CCNA第三学期第2单元练习英语答案

1．What device is responsible for moving packets to destination networks outside the local network?routerswitchIPS deviceIDS device2．Which two items protect a corporate network against malicious attacks at the enterprise edge ? (Choose two.)point of demarcationIP security (IPSec)Data Service Unit (DSU)intrusion prevention system (IPS)intrusion detection system (IDS)3．It is crucial that network administrators be able to examine and configure network devices from their homes. Which two approaches allow this connectivity without increasing vulnerability to external attacks? (Choose two.)Configure a special link at the POP to allow external entry from the home computer.Set up VPN access between the home computer and the network.Install a cable modem in the home to link to the network.Configure ACLs on the edge routers that allow only authorized users to access management ports on network devices.Configure a server in the DMZ with a special username and password to allow external access.4．A DoS attack crippled the daily operations of a large company for 8 hours. Which two options could be implemented by the network administrator to possibly prevent such an attack in the future? (Choose two.)install security devices with IDS and IPS at the enterprise edgereset all user passwords every 30 daysfilter packets based on IP address, traffic pattern, and protocoldeny external workers VPN access to internal resourcesensure critical devices are physically secure and placed behind the demarc5．Which two pieces of information are documented in a logical topology map逻辑拓扑图? (Choose two.)physical cablingservice level agreementsIP addressingIDF locationgroup usage informationfacility floor plans6．Which two situations require a network administrator to use out-of-band management to change a router configuration? (Choose two.)Network links to the router are down.No Telnet password has been configured on the router.The administrator can only connect to the router using SSH.The network interfaces of the router are not configured with IP addresses.Company security policy requires that only HTTPS be used to connect to routers7．Which type of network map shows the location of hosts, network devices, and media?physical topologylogical topologycontrol planebusiness continuity8．When searching for information about authentication methods and usernames of company personnel, where can a network administrator look?Business Continuity PlanBusiness Security PlanNetwork Maintenance PlanService Level Agreement9．An investment company has multiple servers that hold mission critical data. They are worried that if something happens to these servers, they will lose this valuable information. Which type of plan is needed for this company to help minimize loss in the event of a server crash?business securitybusiness continuitynetwork maintenanceservice level agreement10．A network manager wants to have processes in place to ensure that network upgrades do not affect business operations. What will the network manager create for this purpose?business security planbusiness continuity planservice level agreementnetwork maintenance plan11．Which two types of information should be included in a business continuity plan? (Choose two.)maintenance time periodsintrusion monitoring recordsoffsite data storage procedures离站数据存储规程alternate IT processing locations备用 IT 处理位置problem resolution escalation steps12．A network administrator must define specific business processes to implement if a catastrophic disaster prevents a company from performing daily business routines. Which portion of the network documentation is the administrator defining?business security planbusiness continuity plannetwork solvency planservice level agreementnetwork maintenance plan13．Which two router parameters can be set from interface configuration mode接口配置模式? (Choose two.)IP addressTelnet passwordhostnameconsole passwordsubnet maskenable secret password14．What information can an administrator learn using the show version command?Cisco IOS filenameconfigured routing protocolstatus of each interfaceIP addresses of all interfaces15．A network administrator has just inserted a new WIC2T controller into the first available slot of an 1841 router. The administrator needs to configure the first serial interface of this new controller. Which interface should be used?s0/0/0s0/0/1s1/1/0s1/0/1s0/1/116．What is the maximum recommended cable length for Fast Ethernet over UTP?50 meters75 meters100 meters150 meters17．What is the demarcation（分界点）?physical point where the ISP responsibility ends and the customer responsibility begins physical location where all server farm connections meet before being distributed into the Core point of entry for outside attacks and is often vulnerablepoint of entry for all Access Layer connections from the Distribution Layer devices18．A Cisco router needs to be configured from a remote location by the use of out-of-band management. Which method should be used?Use Telnet or SSH and connect to an IP address of a FastEthernet port.Use HTTP to connect to an IP address on a FastEthernet port.Use dial up and a modem to connect to the auxiliary port.拨号和调制解调器连接到辅助端口Use a terminal emulation program and connect to the console port.19．A network administrator needs to configure Telnet access to a router. Which group of commands enable Telnet access to the router?Router(config)# enable password classRouter(config)# line con 0Router(config-line)# loginRouter(config-line)# password ciscoRouter(config)# ip host 192.168.1.1 NewYorkRouter(config)# enable password ciscoRouter(config)# line aux 0Router(config-line)# loginRouter(config-line)# password ciscoRouter(config)# enable password classRouter(config)# line vty 0 4Router(config-line)# password ciscoRouter(config-line)# login20．What type of connection point is a point of presence (POP)?between a client and a hostbetween two local networksbetween a computer and a switchbetween an ISP and an Enterprise network21．Which two statements are true about a network operations center (NOC)? (Choose two.)Most NOCs only have tower servers or desktop servers that provide high-speed storage capabilities for thousands of clients.A NOC is typically used only to monitor and maintain the most critical network components. Because access is secured by firewalls, backup systems are not required in a NOC .Routers, high-speed switches高速交换机, and servers are located within a NOC.High-speed and high-capacity data storage are important aspects of a NOC.22．Which three items would be found in a NOC? (Choose three.)raised floors架空地板all wireless access pointsnetwork monitoring station 网络监控工作站departmental printerscustomer workstationsdata storage devices23．What two features are true of an IDF? (Choose two.)referred to as a wiring closetlocated within the NOCcontains access layer devices for user connectivitycontains firewalls and content filtering devicesalternately called an MDF。