CISCO考试题--基础（70题）

1) What are the layers of the OSI reference model, in order (OSI参考模型有哪些层，按顺序回答)？ A. application, transport, network, physical B. application, presentation, session, network, transport, data link, physical C. application, presentation, session, transport, network, data link, physical D. application, session, transport, physical 答案：C。 O S I参考模型层(应用层、表示层、会话层、传输 层、网络层、数据链路层和物理层)可以很容易地记住： All People Seem To Need Data Processing(每个词的首字母与参考 模型层的首字母对应，译者注)。 2) What is the term for wrapping a data unit with a header and passing it to the next protocol(用报头包装 一个数据信元并传递到下一个协议，代表这个过程的 术语是什么)？ A. Windowing B. Encapsulation C. Wrapping D. Heading 答案：B。使用报头包装数据信元的术语是封装。 3) What is the function of CSMA/CD (CSMA/CD的功 能是什么)？ A. It passes a token around a star topology B. Nodes access the network and retransmit if they detect a collision C. Nodes connect to a dual ring of fiber-optics and use a token-passing scheme D. Nodes break the frames into tiny cells and forward them through a cell-switching network. 答案：B。C S M A / C D功能用来 检测 工程第三方检测合同工程防雷检测合同植筋拉拔检测方案传感器技术课后答案检测机构通用要求培训 冲突。节点访问网络， 如果检测到冲突，将重新传输数据。 4) What does the hierarchical network layer address provide (层次式网络层地址提供了什么)？ A. The hardware address B. The node address and the hardware address C. The network address and the node address D. The network address mapped to the hardware address 答案：C。层次式网络层地址提供了网络地址和每个节点的地址。 5) What qualities match TCP (TCP具有哪些特点)？ A. connectionless, reliable B. connection-oriented, reliable C. connectionless, unreliable D. connection-oriented, unreliable 答案：B。T C P是面向连接的、可靠的传输层协议。 6) What layer of the OSI reference model specifies data formats, such as encryption (OSI参考模型的哪层 规定了数据 格式 pdf格式笔记格式下载页码格式下载公文格式下载简报格式下载 。例如加密)？ A. application B. presentation B. session D. transport E. network F. data link G. physical 答案：B。O S I参考模型的表示层涉及数据格式和语法。 7) A broadcast system means (广播系统的含义是)： A. Only few nodes on the network see the data meant for these nodes B. All nodes on the network see all the data frames C. Network informs all the nodes of a network failure D. None of the above 答案：B。在广播系统中，所有节点看到所有数据帧，而不论该 数据是否为该节点所接收。 8) A Frame Check Sequence (FCS) in the IEEE 802.3 frame includes (IEEE 802.3帧中的帧校验序列( F C S ) 包括)： A. A receiving station address B. A source station address C. A Cyclic Redundancy Check (CRC) value D. A sequence number of the frame 答案：C。F C S包括C R C值。 9) Which statement is true of the Media Access Control (MAC) address (对介质访问控制( M A C )地 址的陈述中，哪一个是正确的)？ A. It is dependent on the hardware location B. It is dependent on the network type C. It is assigned by a vendor D. It changes every time the hardware is plugged turned on and off 答案：C。M A C地址是网络无关的，在此，硬件插入到网络中， 它有相同的M A C地址。 10) What is a Network Control Protocol (NCP) frame in a Point to Point Protocol (PPP) used for (在点对点 协议( P P P )中网络控制协议( N C P )帧的作用是什 么)？ A. Establishing and configuring a connection B. Encryption of data C. Assigning a dynamic address D. Selecting and configuring the network layer protocol 答案：D。点对点协议中的网络控制协议帧用来选择和配置网络 层协议。链路控制协议 ( L C P )用来建立和配置连接。 11) Data Link Connection Identifier (DLCI) in a Frame Relay network identifies what (帧中继网络中的 数据链路连接标识符( D L C I )标识什么)？ A. Data Terminal Equipment (DTE) B. Data Circuit Termination Equipment (DCE) C. A connection between two DTEs D. All of the above 答案：C。帧中继网络中的数据链路连接标识符确定两 个D T E之间的连接。 12) What command would you use to log out of the router and end your session (Select two.) (你将使用什么命令在路由器上注销和结束会话？ (选 择2个) ) A. TERMINATE B. logout C. exit D. session end 答案：B，C。用户可以使用L O G O U T或者E X I T注销路由 器和结束会话。除此之外都是非法I O S命令。 13) You can confirm that you are in the privileged EXEC mode by which prompt (在哪种提示符下可以 确认是处于特权E X E C模式)？ A. Router> B. Router(config)# C. Router# D. Router(config-if)# 答案：C。提示符R o u t e r #证实用户在特权E X E C模式中。 特权E X E C模式允许用户进入配置模式，然后到接口配置模式。 用户访问的第一个模式是用户E X E C模式。 14) The IOS image is normally stored in (IOS映像通常 保存在哪里)？ A. RAM B. NVRAM C. Shared D. Flash 答案：D。I O S映像通常保存在闪存中，并且从闪存启动。R A M保存路由选择表和运行配置。 N V R A M是用于启动配置的。 15) To determine the operational status of an interface, which command do you use (为确定接口的操作状态， 要使用哪个命令)？ A. DISPLAN INTERFACE STAT U S B. show interface C. show status interface D. display interface 答案：B。 16) A boot field value of 0x1 will cause the router to (引导字段值为0 x 1，这将导致路由器)： A. Boot from Flash B. Look for boot system commands in the startup configuration C. Look for an IOS image on a TFTP server D. Boot from ROM 答案：D。设置为0 x 1的引导字段会使得路由器从R O M启动。 17) To view the configuration register settings, which command do you enter (为查看配置注册表设置，你需 要输入哪个命令)？ A. SHOW RUNNING-CONFIGURAT I O N B. show startup-configuration C. show version D. show controllers 答案：C。配置注册表设置是在命令SHOW VERSION的最后一行。 该命令也显示了路由器 启动时间和I O S版本。 18) What is the command to view the stored configuration in NVRAM (查看存储在N V R A M中的 配置信息的命令是什么)？ A. SHOW RUNNING-CONFIG B. show startup-config C. show version D. show NVRAM 答案：B。SHOW STA RT U P - C O N F I G将显示保存在N V R A M中的配置。SHOW RUNNING C O N F I G将显示当前运行的配置。 19) What is the command needed to copy the current operational configuration to a TFTP server (为将当前 运行的配置复制到T F T P服务器上，需要哪个命令)？ A. COPY RUNNING-CONFIG TFTP B. copy startup-config tftp C. copy tftp running-config D. copy tftp startup-config 答案：A。 20) How do you suspend a Telnet session (如何挂起一 个Te l n e t会话)？ A. Use the command SUSPEND SESSION B. Use the keystrokes CTRL-ALT-6 C. Use the keystrokes CTRL-SHIFT-6-X D. A Telnet session cannot be suspended. You must quit the session and initiate it again if you want to go back to it. 答案：C。 21) What is the characteristic of a link-state routing protocol that enables it to make better routing decisions (链路状态路由协议的哪个特点使其作出比较 好的路由决策)？ A. Its metrics take bandwidth into account B. It uses a hello protocol C. It broadcasts the contents of its routing table periodically to its neighbors D. None of the above. 答案：A。可以使路由器更好地作出路由选择决定的链接状态路 由选择协议的特性，在于它的度考虑带宽。答案C是距离向量路由 选择协议的特性。 22) The command COPY FLASH TFTP FILE2600 copies ( 命令COPY FLASH TFTP F I L E 2 6 0 0复 制)： A. Contents of file from Flash into file2600 of the TFTP server B. Contents of TFTP into file2600 in the Flash C. Contents of file2600 in the TFTP to file2600 in the Flash D. Contents of file2600 in the TFTP into Flash. 答案：A。 23) What command can be used to see the router’s neighbors from your local router if no network layer protocols are configured (如果没有配置网络层协议。 哪个命令可以用于从本地路由器查看路由器的邻居)？ A. SHOW CDP B. show cdp neighbor C. show neighbor D. show network 答案：B。 24) What is the network address for the address 96.2.3.16 (地址9 6 . 2 . 3 . 1 6的网络地址是什么)？ A. 96.2.0.0 B. 96.2.3.0 C. 96.0.0.0 D. Can ’t tell 答案：D。没有给出掩码，所以不能得知网络地址是多少。 25) How many hosts are supported by a Class C network address, without subnetting (C类网络地址在 没有子网的情况下支持多少个主机)？ A. 254 B. 65,000 C. 255 D. 16,000 答案：A。 26) What is the decimal value of the binary number 11 0 0 1 0 11 (二进制数11 0 0 1 0 11的十进制值 是多少)？ A. 203 B. 171 C. 207 D. 193 答案：A。 27) What is the significance of the address 3.255.255.255 (地址3 . 2 5 5 . 2 5 5 . 2 5 5的含义是 什么)？ A. It is a host number B. It is a local broadcast C. It is a directed broadcast D. It is an illegal address 答案：C。 28) The purpose of subnetting is to (子网划分的目的 是)： A. Segment and organize a single network at the network layer B. Divide a network into several different domains C. Allow bridging between network segments D. Isolate groups of hosts so they can’t communicate 答案：A。划分子网的目的是在网络层分段和组织单个 网络。这是最好的答案。子网不能创 建单独的域。它提供了网段之间路由的 方法 快递客服问题件处理详细方法山木方法pdf计算方法pdf华与华方法下载八字理论方法下载 ，而不是 网段之间的桥路。它确实提供了主机组 之间的隔离，但是，它不能用来阻止它们通信。 29) If we included six subnet bits in the subnet mask for a Class C address, how many hosts would each network support (如果在C类地址的子网 掩码中加入了6个子网位，每个网络可以支 持多少个主机)？ A. 254 B. 30 C. 4 D. 2 答案：D。 30) VLSM allows us to (VLSM允许我们)： A. Use different subnet masks in different parts of the network B. Divide a subnet into secondary subnets C. Use classless IP addressing D. Both A and B 答案：D。V L S M允许我们在网络的不同部分中使用 不同的子网掩码，并且将子网分为两个 次级子网。答案C不正确，因为我们可以不实现V L S M 而使用非类地址。 31) What class of IP address is usually associated with supernetting (IP地址的哪类通常和超网相关)？ A. Class A B. Class B C. Class C D. Class D 答案：C。超网通常用来组合若干C类网络。 32) For an IP address of 165.3.34.35, netmask of 255.255.255.224, and a subnet ID of 165.3.34.32, the usable host address range is: (对于I P地址1 6 5 . 3 . 3 4 . 3 5，网络掩码2 5 5 . 2 5 5 . 2 5 5 . 2 2 4，子网I D 1 6 5 . 3 . 3 4 . 3 2，可用的主机地址范围为)： A. From 165.3.34.34 to 165.3.34.64 B. From 165.3.34.35 to 165.3.34.65 C. From 165.3.34.33 to 165.3.34.62 D. From 165.3.34.33 to 165.3.34.63 答案：C 33) Which of the following services uses a process called windowing (下面的哪一个服务使用了所谓的窗 口机制)？ A. Reliable data transfer B. Connection-oriented virtual circuit C. Buffered transfer D. Resequencing E. Multiplexing F. Efficient, full-duplex transmission G. Flow control 答案：G。窗口技术是一个流控制的格式。 34) What is UDP (什么是U D P )？ A. An API that makes the transport layer independent B. A connectionless, unreliable transport protocol C. An API that allows multiple applications to share a network connection D. A function that makes remote procedures appear to be local 答案：B。U D P是一个无连接的、不可靠的传输协议。 35) What is ICMP (什么是I C M P )？ A. It is a network layer protocol that handles control messages B. It is a network layer protocol that resolves addresses C. It is a session layer API that makes remote procedures transparent to a user D. It is a transport layer function for unreliable transport 答案：A。I C M P在网络层上处理控制消息。 36) The spanning-tree algorithm allows (生成树算法允 许)： A. Forwarding of packets with no control B. Forwarding of broadcasts to an interface which already has received the broadcast C. Prevention of duplication of forwarding of packets D. A and B only 答案：C。生成树以可控制的方式转发数据包。 37) IP helper addresses are a form of _ _ _ _ _ _ _ _ _ _ _ _ _ _ addressing and require the command specification of _ _ _ _ _ _ _ _ _on every interface receiving broadcasts that need to be forwarded (IP辅 助地址是一种什么类型的寻址方法，在每一个接收到 需要转发的广播接口上需要什么命令说明)？ A. Static / IP header address B. Dynamic / IP forward-protocol UDP C. Dynamic / IP forward-protocol TCP 答案：A。 38) Which of the following protocols provide address resolution (下面的哪一个协议提供了地址解析)？ A. ICMP B. RARP C. IP D. UDP E. TCP 答案：B 39) Which of the following statements is true of ARP (下面对A R P的陈述中，哪一个是正确的)？ A. It makes a MAC address logically independent of the physical hardware B. It makes it necessary for the administrator to physically manage the MAC address of each N I C C. It integrates routing function with the physical and data link layers D. It routes packets based on destination host, not on destination network 答案：A。使用A R P，管理员不必实际管理每个N I C的M A C 地址。A R P从物理层和数据链路层中分离出路由选择功能。A R P 在目标网络上路由数据包，而不是在目标主机上。 40) Reverse Address Resolution Protocol (RARP) is termed“r e v e r s e”because (反向地址解析协议( R A R P )中的“反向”的含义是)： A. It is used by the system that knows its IP address but does not know its MAC address B. It is used by the system that knows its MAC address but does not know its IP address C. It is used by the system that knows the destination’ s IP address but does not know the d e s t i n a t i o n ’s MAC address D. It is used by the system that knows the destination’ s MAC address but does not know the d e s t i n a t i o n ’s IP address 答案：B。系统使用R A R P来解析I P地址。 41) Inverse Address Resolution Protocol (InARP) is generally used by (逆向地址解析协议( I n A R P )通常 由什么使用)？ A. Broadcast networks B. Nonbroadcast networks C. Both broadcast and nonbroadcast networks 答案：B。 42) The PING command makes use of what ICMP parameter (PING命令使用了什么I C M P 参数 转速和进给参数表a氧化沟运行参数高温蒸汽处理医疗废物pid参数自整定算法口腔医院集中消毒供应 )？ A. Redirect B. Source quench C. Echo reply D. Destination unreachable 答案：C。 43) ICMP Redirect is sent by (ICMP重定向由什么发 出)？ A. A host to the gateway B. A gateway to the host C. A router to another router D. A router to a network__ 答案：B。 44) What are the two basic mechanisms that make up a routing protocol (构成路由选择协议的两个基本机制 是什么)？ A. Route selection B. Flooding C. Autonomous Systems D. Data Tr a n s m i s s i o n 答案：A，D。 45) When a node on one network sends a packet to a node on another segment that is three hops away, what addresses are included in the initial addressing of that packet (select 2) (当网络上的节点向另一个跳3个跳上 的节点发送信息表时，在那个信息表的初始地址中包 含了什么地址)？（选两个） A. The network address of the router B. The MAC layer address of the router C. The network address of the destination node D. The MAC layer address of the destination node 答案：B，C。初始的数据包发送带有目标节点和M A C层(路由 器的硬件地址)的网络地址的数据包。 46) What is an autonomous system (什么是自治系 统)？ A. An area B. A domain C. A contiguous set of routers defined within a larger internetwork, that do not share routing information with the external internetwork D. All of the above E. None of the above 答案：D。自治系统也可认为是一个区域或者域。它是在较大互 连网络中定义的连续路由器 集合；尽管它们共享路由选择信息，但是它们不向区域外传播信 息。 47) What is a default route (什么是默认路由)？ A. A type of static route B. A destination for any nonroutable packet C. Gateway of last resort D. All of the above E. None of the above 答案：D。默认路由通常是静态类型的路由，它可看作是最后求 助的网关，在此所有非路由 数据包进行转发以进一步处理。 48) What is RIP (什么是R I P )？ A. RIP is an older distance vector Interior Gateway Protocol with a 30-second update timer and . maximum of 15 hops (where “i n f i n i t y” is 16 hops) B. RIP is a new link-state protocol created by Cisco C. RIP is a proprietary protocol created by Cisco that has two versions; only version 2 is used currently D. RIP is a distance vector Interior Gateway Protocol with a 224 maximum network diameter (maximum 224 hops) 答案：A 49) What do link-state protocols use as a metric (链路 状态协议使用什么作为度)？ A. Hops B. Cost C. CPU usage D. Network operational time 答案：B。 50) Flooding in link-state protocol means what (链路状 态协议中的泛洪法意味着什么)？ A. A router sending all routing information to its neighbors B. A router broadcasting all information to all routers in the network C. The neighbors of a link-state router receiving a link-state packet, copying it, and then forwarding it to the rest of the network D. A router sending information about the routers that have changed 答案：C。链接状态协议中的泛洪就是指链接状态路由 器的邻居接收到有关链接状态数据包，复制该数据包， 然后将它转发到网络中的其余部分。 51) Enhanced Interior Routing Gateway Protocol uses which of the following (增强内部路由选择网关协议使 用下列的哪一种)？ A. Link-state vector B. Diffusion Update Algorithm C. Distance vector D. A and B only E. B and C only 答案：E。E I G R P将距离向量和D U A L一起使用， 这改进了收敛属性。 52) What is the administrative distance for directly connected routes (直接连接路由的管辖距离是多少)？ A. 0 B. 1 C. 100 D. 120 答案：A。 53) Which command do you use to view the currently configured default route (你用哪一个命令来查看当前 配置的默认路由)？ A. SHOW IP CONFIG B. show default gateway C. show ip route D. show default network 答案：C 54) Identify the proper syntax for assigning a secondary IP address to an interface (确认在接口上指 定辅助I P地址的正确语法)。 A. IP SECONDARY ADDRESS 10.10.10.10 255.0.0.0 B. IP 10.10.10.10 255.255.0.0 secondary C. IP address secondary 10.10.10.10 255.255.255.0 D. IP address 10.10.10.10 255.255.255.0 secondary 答案：D。 55) What does the IP DOMAIN-NAME command do (IP DOMAIN⋯N A M E命令的作用是什么)？ A. Names the domain that the Cisco router belongs to B. Names domains the router cannot find directly C. Appends a domain to unqualified requests D. Broadcasts domain name across subnets 答案：C。IP DOMAIN-NAME命令将所列的域追加到未限定的域请 求中，以查找全限定的 主机名。 56) Which syntax for setting the default gateway is correct (下面的哪一个是设置默认网关的正确语法)？ A. IP DEFA U LT- G AT E WAY 10.10.10.100 B. IP 10.10.10.100 default-gateway C. Default-gateway 10.10.10.100 255.255.255.0 D. IP default-gateway 10.10.10.100 255.255.255.0 答案：A。 57) Where are the host name-to-address mappings stored (在哪里保存主机名-地址映射)？ A. Address cache B. Host cache C. Static RAM D. IP Config table 答案：B。 58) If two routing protocols recommend the same route to a router, the router will (如果两个路由选择协 议提出了达到同一个路由器的路由，则路由器将)： A. Select either of the two routes at random, with no preference for one over the other B. Select the route that has a lower administrative distance value C. Select the route that has a higher administrative distance value D. Place both the routes in the routing table 答案：B。路由器将选择和有较低管辖距离值的协议相关的路由。 59) What is the default time interval at which RIP updates are sent (发送R I P更新的默认时间间隔是多 少)？ A. 30 seconds B. 15 seconds C. 60 seconds D. 90 seconds 答案：A。 60) In the TIMERS BASIC command, the parameter to specify the time after which the route is to be taken out from the routing table is (在TIMERS BASIC命令 中，规定从路由选择表中删除路由的时间参数是)： A. SLEEPTIME B. holddown C. invalid D. flush 答案：D。 61) In order to forward broadcast traffic for certain UDP requests, which of the following commands should be used (为转发某个U D P请求的广播通信，必 须使用下列的哪一个命令)？ A. IP HELPER-ADDRESS B. ip address C. ip forward-protocol D. interface E. A and C only F. B and C only 答案：E。IP HELPER命令标识广播要发向的网络， IP FORWA R D命令告诉路由器它需要使用U D P来转发数据包。 62) In the event of no matching rule being found in an IP access list, what happens to the transmission packet at the end (在I P访问列表中，如果到最后也没有找到 匹配，则传输数据包将如何)？ A. It is dropped B. It is allowed to pass C. A broadcast is sent out notifying the sending host D. A Packet Return (PR) is issued to the sending host 答案：A 63) Consider the following access list: ACCESS-LIST 50 DENY 136.120.3.1 ACCESS-LIST 50 DENY 143.22.1.0 0.0.0.255 Which statement represents the most complete description of the results of applying this list as a packet filter (考虑下述访问列表： ACCESS-LIST 50 DENY 136.120.3.1 ACCESS-LIST 50 DENY 143.22.1.0 0.0.0.255 下列哪个陈述最完全地描述了访问列表作为数据包过 滤的结果)？ A. It will deny all traffic destined for any host on network 136.120.3.0 B. It will deny all traffic destined for network 143.22.1.0 C. It will deny all traffic from the host at 136.120.3.1 D. It will deny all IP traff i c 答案：D。访问列表号5 0在 标准 excel标准偏差excel标准偏差函数exl标准差函数国标检验抽样标准表免费下载红头文件格式标准下载 的I P访问列表的范围中，这些 列表仅仅在源地址上过滤，而 不是在目标地址上过滤，所以答案A和答案B都不是正确的。因为 在每个范围列表末尾没有隐 含的DENY ANY，所以所有没有明确允许的通信都取消。因为没有 明确允许的通信，所以取 消全部通信。 64) Which command would be used to configure a packet filter for IP traffic (下列哪个命令可用来配置I P通信量的数据包过滤)？ A. ROUTER(CONFIG-IF)#IP ACCESS-LIST 100 B. Router(config-if)#ip access-group 42 in C. Router(config)#access-group 102 D. Router(config-if)#access-group 75 E. Router(config-if)#ip output-packet-filter 11 2 答案：B。 65) Which command would be used to configure an inbound packet filter for TCP traffic (下列哪个命令可 用来配置T C P通信量的入站数据包过滤)？ A. ROUTER(CONFIG-IF)#TCP PA C K E T- F I LTER 101 B. Router(config-if)#ip packet-filter 101 in C. Router(config-if)#ip access-group 99 in D. Router(config-if)#ip access-group 100 in E. Router(config-if)#ip access-group 100 答案：D。过滤T C P通信的数据包过滤可以通过使用IP ACCESS-GROUP命令、使用I P扩展 访问列表来应用。不存在命令TCP PA C K E T- F I LT E R或者 IP PA C K E T- F I LT E R。答案C的错误在于列表9 9是一个标 准的I P访问列表，它不能过滤T C P通信。答案E的错误在于需要 指定关键字I N。默认的方向是出站。 66) 下列哪些协议是专有的？ A. RIP B. OSPF C. EIGRP D. BGP 答案：C。 67) 主机地址192.168.190.55/27对应的广播地址是什 么？ A. 192.168.190.59 B. 192.168.190.55 C. 192.168.190.63 D. 192.168.190.0 答案：C。 68) 静态路由的写法是ip route 10.1.1.0 255.255.255.0 FastEther 1/0 ,该路由的管理距离是什么？ A. 0 B. 1 C. 2 D. 3 答案：B。 69) 下列哪个是EIGRP的保留组播地址？ A. 224.0.0.1 B. 224.0.0.5 C. 224.0.0.9 D. 224.0.0.10 答案：D。 69) 默认情况下,OSPF在广播网络中，Hello分组的间隔 是多少？ A. 5秒 B. 10秒 C. 30秒 D. 40秒 答案：B。