CCNA艾迪飞CCIE实验室
V13题库试题分析
题库讲解：吴老师（艾迪飞CCIE实验室）
资料整理：bengyaju
首发网站：https://www.360docs.net/doc/d05516576.html,
1.What are two reasons that a network administrator would use access lists?(Choose two.)
A.to control vty access into a router
B.to control broadcast traffic through a router
C.to filter traffic as it passes through a router
D.to filter traffic that originates from the router
E.to replace passwords as a line of defense against security incursions
Answer:AC
解释一下：在VTY线路下应用ACL，可以控制从VTY线路进来的telnet的流量。
也可以过滤穿越一台路由器的流量。
2.A default Frame Relay WAN is classified as what type of physical network?
A.point-to-point
B.broadcast multi-access
C.nonbroadcast multi-access
D.nonbroadcast multipoint
E.broadcast point-to-multipoint
Answer:C
解释一下：在默认的情况下，帧中继为非广播多路访问链路。但是也可以通过子接口来修改他的网络的类型。
3．Refer to the exhibit.How many broadcast domains exist in the exhibited topology?
A.one
B.two
C.three
D.four
E.five
F.six
Answer:C
解释一下：广播域的问题，在默认的情况下，每个交换机是不能隔离广播域的，所以在同一个区域的所有交换机都在同一个广播域中，但是为了减少广播的危害，将广播限制在一个更小的范围，有了VLAN的概念，VLAN表示的是一个虚拟的局域网，而他的作用就是隔离广播。所以被VLAN隔离了的每个区域都表示一个单独的广播域，这样一个VLAN中的广播的流量是不能传到其他的区域的，所以在上题中就有3个广播域了。
4.A single802.11g access point has been configured and installed in the center of a square office.
A few wireless users are experiencing slow performance and drops while most users are operating at peak efficiency.What are three likely causes of this problem?(Choose three.)
A.mismatched TKIP encryption
B.null SSID
C.cordless phones
D.mismatched SSID
E.metal file cabinets
F.antenna type or direction
Answer:CEF
6.The command frame-relay map ip10.121.16.8102broadcast was entered on the router.Which of the following statements is true concerning this command?
A.This command should be executed from the global configuration mode.
The IP address10.121.16.8is the local router port used to forward data.
C.102is the remote DLCI that will receive the information.
D.This command is required for all Frame Relay configurations.
E.The broadcast option allows packets,such as RIP updates,to be forwarded across the PVC.
Answer:E
解释一下：关于命令frame-relay map ip10.121.16.8102broadcast,这个命令用于手工静态添加一条映射，到达10.121.16.8的流量封装一个DLCI号为102，而且这条PVC是支持广播的流量的，比如RIP的更新包。因为在默认的情况下，帧中继的网络为非广播的，而RIP在其上是无法发包的。
8．Which of the following are associated with the application layer of the OSI model?(Choose two.)
A.ping
B.Telnet
C.FTP
D.TCP
E.IP
Answer:BC
解释一下：在OSI7层模型中位于应用层的应用有telnet和ftp这两种应用。
9.For security reasons,the network administrator needs to prevent pings into the corporate networks from hosts outside the internetwork.Which protocol should be blocked with access control lists?
A.IP
B.ICMP
C.TCP
D.UDP
Answer:B
解释一下：PING命令利用ICMP协议的echo,和echo-replay两个报文来检测链路是否连通的。所以如果要阻止PING的流量到网络，就只要过滤掉ICMP的应用就可以了。
10．Refer to the exhibit.The network administrator has created a new VLAN on Switch1and added host C and host D.The administrator has properly configured switch interfaces FastEthernet0/13through FastEthernet0/24to be members of the new VLAN.However,after the network administrator completed the configuration,host A could communicate with host B,but host A could not communicate with host C or host D.Which commands are required to resolve this problem?
A.Router(config)#interface fastethernet0/1.3
Router(config-if)#encapsulation dot1q3
Router(config-if)#ip address192.168.3.1255.255.255.0
B.Router(config)#router rip
Router(config-router)#network192.168.1.0
Router(config-router)#network192.168.2.0
Router(config-router)#network192.168.3.0
C.Switch1#vlan database
Switch1(vlan)#vtp v2-mode
Switch1(vlan)#vtp domain cisco
Switch1(vlan)#vtp server
D.Switch1(config)#interface fastethernet0/1
Switch1(config-if)#switchport mode trunk
Switch1(config-if)#switchport trunk encapsulation isl
Answer:A
解释一下：这是一个多VLAN间通讯的问题，虽然都同在一台交换机上，但是由于处在不同的VLAN中，而导致了不同VLAN中的主机是不能通讯的。这时我们就需要借助与trunk和三层的路由功能了，在交换机和路由器之间封装TRUNK，这样可以允许交换机间的二层的通讯，但是由于两个VLAN是划分到不同的网段中的，因此需要借助路由器的路由功能来实现三层的可达，可以将VLAN中的主机的网关指定为路由器与该VLAN相连的子接口的地址，这样VLAN中的数据包就都会发往网关，而由网关来进行进一步的转发。
在这个题中，题目给出了路由器的的子接口的网段，而又给出了VLAN2与路由器相连的接
IP地址，所以剩下的一个网段就是给VLAN3的了，所以要在路由器上将与一个子接口划分到VLAN3，并给其分配另一个网段中的IP地址。这样就可以了。
11．What are two recommended ways of protecting network device configuration files from outside network security threats?(Choose two.)
A.Allow unrestricted access to the console or VTY ports.
https://www.360docs.net/doc/d05516576.html,e a firewall to restrict access from the outside to the network devices.
C.Always use Telnet to access the device command line because its data is automatically encrypted.
https://www.360docs.net/doc/d05516576.html,e SSH or another encrypted and authenticated transport to access device configurations.
E.Prevent the loss of passwords by disabling password encryption.
Answer:BD
解释一下：要确保外部的安全的站点才可以访问我的网络，这就涉及到了安全的问题了，我们可以使用防火墙来限制外网中来的设备；也可以通过SSH或加密和认证来控制。
12．Refer to the exhibit.The access list has been configured on the S0/0interface of router RTB in the outbound direction.Which two packets,if routed to the interface,will be denied?(Choose two.)
access-list101deny tcp192.168.15.320.0.0.15any eq telnet
access-list101permit ip any any
A.source ip address:192.168.15.5;destination port:21
B.source ip address:,192.168.15.37destination port:21
C.source ip address:,192.168.15.41destination port:21
D.source ip address:,192.168.15.36destination port:23
E.source ip address:192.168.15.46;destination port:23
F.source ip address:,192.168.15.49destination port:23
DE
解释一下：这个访问列表定义了两个语句：
access-list101deny tcp192.168.15.320.0.0.15any eq telnet
access-list101permit ip any any
在访问列表中匹配的顺序是从上到下，如果匹配了某一句，就退出访问列表，如果没有就一直往下匹配，在访问列表中有一句隐含的拒绝所有。所以不管怎么样都有一句是能被匹配的。在上题中，他定义的第一句是拒绝到从192.168.15.32-192.168.15.47发出的任何的telnet的流量，然后第二句定义的就是允许所有的IP流量。而且要明确telnet的流量使用的是端口23,所以这个题的答案就很明确了。
13．Refer to the exhibit.Switch1has just been restarted and has passed the POST routine.Host A sends its initial frame to Host C.What is the first thing the switch will do as regards populating the switching table?
A.Switch1will add192.168.23.4to the switching table.
B.Switch1will add192.168.23.12to the switching table.
C.Switch1will add000A.8A47.E612to the switching table.
D.Switch1will add000B.DB95.2EE9to the switching table.
Answer:C
解释一下：交换机重新启动了，这个时候交换机的MAC地址表是空的，当主机A发送数据给主机C而经过交换机时，交换机根据他的工作的原理他要进行原MAC地址学习，而因为对于这个目的MAC地址无记录，而将这个流量从除收到的这个接口外的所有接口泛洪出去。所以在最开始的一步中，交换机是记录下主机A的MAC地址000A.8A47.E612到他的MAC地址表中。
14.he user of Host1wants to ping the DSL modem/router at192.168.1.254.Based on the Host1 ARP table that is shown in the exhibit,what will Host1do?
A.send a unicast ARP packet to the DSL modem/router
B.send unicast ICMP packets to the DSL modem/router
C.send Layer3broadcast packets to which the DSL modem/router responds
D.send a Layer2broadcast that is received by Host2,the switch,and the DSL modem/router Answer:B
解释一下：在下面的表中我们可以看到ARP表中有关于192.168.1.254的ARP条目，所以在这主机都只需要发送单播的ICMP包到DSL modem/router即可。
15.Refer to the exhibit.What is the most efficient summarization that R1can use to advertise its networks to R2?
A.172.1.0.0/22
B.172.1.0.0/21
C.172.1.4.0/22
D.172.1.4.0/24
172.1.5.0/24
172.1.6.0/24
172.1.7.0/24
E.172.1.4.0/25
172.1.5.0/24
172.1.6.0/24
172.1.7.0/24
Answer:C
解释一下：这还是一个关于汇总的问题。要求R1将所有的网段用汇总的条目发送给R2，因为这些条目的网络位是相同的都为172.1，所以在这需要汇总的只是第3个八位，将4，4，5，6，7这些写成二进制的形式，然后找出相同的位数，则有相同位数的字节就是他们的掩码的位数，而最小的有相同位的最小的数字就是他们的基数位，所以R1通告出去汇总的条目为172.2.4.0/22。
16.Refer to the exhibit.Assume that all router interfaces are operational and correctly configured. In addition,assume that OSPF has been correctly configured on router R2.How will the default route configured on R1affect the operation of R2?
A.Any packet destined for a network that is not directly connected to router R1will be dropped.
B.Any packet destined for a network that is not directly connected to router R2will be dropped immediately.
C.Any packet destined for a network that is not directly connected to router R2will be dropped immediately because of the lack of a gateway on R1.
D.The networks directly connected to router R2will not be able to communicate with the 172.16.100.0,172.16.100.128,and172.16.100.64subnetworks.
E.Any packet destined for a network that is not referenced in the routing table of router R2will be directed to R1.R1will then send that packet back to R2and a routing loop will occur.
Answer:E
解释一下：在R1上产生了一个OSPF的缺省路由，出接口指定为S0/0，这条缺省路由以5类LSA 的形式通告给了R2，于是R2上也有了一条标记为O*E20.0.0.0/0出接口为Serial0/0的路由。所以R2收到任何路由表中没有的目的网段时，就将指定给R1，而R1根据缺省路由的出接口
R2，这样就形成了一个路由的环路。
17.A network interface port has collision detection and carrier sensing enabled on a shared twisted pair network.From this statement,what is known about the network interface port?
A.This is a10Mb/s switch port.
B.This is a100Mb/s switch port.
C.This is an Ethernet port operating at half duplex.
D.This is an Ethernet port operating at full duplex.
E.This is a port on a network interface card in a PC.
Answer:C
解释一下：一个接口有冲突检测和载波侦听，而且是使用双绞线的网络，那么对于这个接口我们可以推测出他是以太接口，而且是工作在半双工的模式下。
20.Refer to the topology and router configuration shown in the graphic.A host on the LAN is accessing an FTP server across the Internet.Which of the following addresses could appear as a source address for the packets forwarded by the router to the destination server?
A.10.10.0.1
B.10.10.0.2
C.199.99.9.33
D.199.99.9.57
E.200.2.2.17
F.200.2.2.18
Answer:D
解释一下：这是个NAT地址转换的题目，在这f0/0接口连接下的为私有的地址，这些地址是不能同外网进行通讯的，这时就借助NAT，将内网的私有地址转换为可以在公网上通讯的地址，我们看到NAT POOL中定义的转换后的公有地址为199.99.9.40到199.99.9.62，则表示这段地址是我转换后的内网全局地址，所以HOST想要穿过INTERNET访问FTP服务器，则需
199.99.9.40到199.99.9.62之内的地址，在上面的答案中只有地址199.99.9.57满足条件，所以答案就是D了。
21.A company is installing IP phones.The phones and office computers connect to the same device.To ensure maximum throughput for the phone data,the company needs to make sure that the phone traffic is on a different network from that of the office computer data traffic.What is the best network device to which to directly connect the phones and computers,and what technology should be implemented on this device?(Choose two.)
A.hub
B.router
C.switch
D.STP
E.subinterfaces
F.VLAN
Answer:CF
解释一下：公司的语音设备和办公的设备都连在相同的设备上，还要确保语音的数据流在不同与公司的办公的数据流量，最好的网络设备当然是交换机了，然后利用VLAN的技术就完全可以满足所有的要求了。
22.Refer to the exhibit.Which statement describes DLCI17?
A.DLCI17describes the ISDN circuit between R2and R3.
B.DLCI17describes a PVC on R2.It cannot be used on R3or R1.
C.DLCI17is the Layer2address used by R2to describe a PVC to R3.
D.DLCI17describes the dial-up circuit from R2and R3to the service provider.
Answer:C
解释一下：DLCI是在Frame-relay中的描述二层信息的地址，他的地位等同于以太网中的MAC 地址。我们以R2上的DLCI17来看，DLCI17描述的是：从这个接口出去的目的地为R3的接口的这条PVC的二层的地址为17。
23.Which routing protocol by default uses bandwidth and delay as metrics?
RIP
B.BGP
C.OSPF
D.EIGRP
Answer:D
解释一下：在我们的路由协议中使用复合度量的协议只有IGP和EIGPR，而他们在默认的情况下是使用带宽和延时来计算度量的。
25.In the implementation of VLSM techniques on a network using a single Class C IP address, which subnet mask is the most efficient for point-to-point serial links?
A.255.255.255.0
B.255.255.255.240
C.255.255.255.248
D.255.255.255.252
E.255.255.255.254
Answer:D
解释一下：在点到点的链路上因为只需要分配两个地址给两端就可以了，所以加上网络地址和广播地址，这个网段也就只需要有4个地址了，所以网络位需要匹配30位,掩码就为255.255.255.252．
26.Refer to the exhibit.The networks connected to router R2have been summarized as a 192.168.176.0/21route and sent to R1.Which two packet destination addresses will R1forward to R2?(Choose two.)
A.192.168.194.160
B.192.168.183.41
C.192.168.159.2
192.168.183.255
E.192.168.179.4
F.192.168.184.45
Answer:BE
解释一下：这个题其实就是考察的汇总的问题，他说的意思是R2发送了一个汇总的路由192.168.176.0/21给R1，哪两个包文的目的地R1仍将转发给R2。这还是汇总的问题的一个反向的考察，根据21位的掩码位数可以推断在第3个八位字节的前5位是相同的，不同的是后面的3位，而将176写成二进制的形式为10110000，所以可以看出来明细的路由可以是176-183，所以在上面的答案中可以很容易看到答案B和E是我们的明细路由。
27.Refer to the exhibit.Switch-1needs to send data to a host with a MAC address of 00b0.d056.efa4.What will Switch-1do with this data?
A.Switch-1will drop the data because it does not have an entry for that MAC address.
B.Switch-1will flood the data out all of its ports except the port from which the data originated.
C.Switch-1will send an ARP request out all its ports except the port from which the data originated.
D.Switch-1will forward the data to its default gateway.
Answer:B
解释一下：首先Switch1需要发送一个数据到MAC地址为00b0.d056.efa4的主机，了解到目的地后，就查看他的MAC地址表，然后发现在MAC地址表中没有这个MAC地址的条目存在。交换机在收到未知的单播，组播和广播时，都采用的是泛洪的方式，往除收到数据的这个接口外的所有接口都发送。所以在这儿，Switch1也采取的上泛洪的方式。
28.wo routers named Atlanta and Brevard are connected by their serial interfaces as shown in the exhibit,but there is no data connectivity between them.The Atlanta router is known to have a correct configuration.Given the partial configurations shown in the exhibit,what is the problem on the Brevard router that is causing the lack of connectivity?
A.A loopback is not set.
B.The IP address is incorrect.
C.The subnet mask is incorrect.
D.The serial line encapsulations are incompatible.
E.The maximum transmission unit(MTU)size is too large.
F.The bandwidth setting is incompatible with the connected interface.
Answer:B
解释一下：很明显的错误啊，两台路由器的串行接口的地址配置错误，不是在相同的网段，从而导致了不能通讯。
29.Which two values are used by Spanning Tree Protocol to elect a root bridge?(Choose two.)
A.amount of RAM
B.bridge priority
C.IOS version
D.IP address
E.MAC address
F.speed of the links
Answer:BE
解释一下：生成树的选举的问题，根桥的选举是通过比较ＢＩＤ的，而ＢＩＤ由桥优先级和ＭＡＣ地址组成的．所以在选根桥的时候需要比较的是桥优先级和ＭＡＣaddress。
30.Refer to the exhibit.Which switch provides the spanning-tree designated port role for the network segment that services the printers?
A.Switch1
B.Switch2
C.Switch3
D.Switch4
Answer:C
解释一下：这是个关于生成树选举的问题，我们首先需要找到根桥，而根桥的选举是通过比较桥ID的,而且是越小越优先，桥ID的组成为桥优先级和MAC地址。所以我们通过上图可以找到根桥为switch1。
然后在非根桥上选出根端口，通过比较到根桥的花费来选举的，花费最小的就是根端口。因为上图中没有表示出链路的带宽，所以无法比较他们的花费。
下一步我们来选举指派端口。每条链路都需要有一个DP，先是比较花费，如果花费相同则比较BID（桥优先级），仍是越小越优先，根据上图的表识，我们可以找到每条链路上的DP，而连Printers的链路上的DP就为Switch3，因为他有更小的MAC地址。
32.Refer to the exhibit.Why would the network administrator configure RA in this manner?
A.to give students access to the Internet
B.to prevent students from accessing the command prompt of RA
C.to prevent administrators from accessing the console of RA
D.to give administrators access to the Internet
E.to prevent students from accessing the Internet
F.to prevent students from accessing the Admin network
Answer:B
解释一下：在这儿，将ＡＣＬ应用到ＶＴＹ线路下，而且是ＩＮ的方向，表示凡是被我的ＡＣＬ允许的才能telnet到我．在ＲＡ上配置的是permit10.1.1.00.0.0.255根据隐式的deny any 允许Ａdmin的网段中的用户可以telnet到他，所以Ｓtudent的网段中的用户是被拒绝的．33.In order to allow the establishment of a Telnet session with a router,which set of commands must be configured?
A.router(config)#line console0
router(config-line)#enable password cisco
B.router(config)#line console0
router(config-line)#enable secret cisco
router(config-line)#login
C.router(config)#line console0
router(config-line)#password cisco
login
D.router(config)#line vty0
router(config-line)#enable password cisco
E.router(config)#line vty0
router(config-line)#enable secret cisco
router(config-line)#login
F.router(config)#line vty0
router(config-line)#password cisco
router(config-line)#login
Answer:F
解释一下：telnet是一个应用层的应用，他使用的是vty线路，而且在默认的情况下，是需要访问的线路下设有密码的。而在VTY线路下设置密码的命令为passwork string,而VTY线路下的另一个命令login则是默认的，可写也可不写。如果想Telnet时在VTY线路下不设置密码也可以访问这个线路，可以在该VTY线路下输入命令no login。
34.Refer to the exhibit.The two exhibited devices are the only Cisco devices on the network.The serial network between the two devices has a mask of255.255.255.252.Given the output that is shown,what three statements are true of these devices?(Choose three.)
A.The Manchester serial address is10.1.1.1.
B.The Manchester serial address is10.1.1.2.
C.The London router is a Cisco2610.
D.The Manchester router is a Cisco2610.
E.The CDP information was received on port Serial0/0of the Manchester router.
F.The CDP information was sent by port Serial0/0of the London router.
ACE
解释一下：ＣＤＰ是ＣＩＳＣＯ私有的一个二层的协议，但是他却可以发现三层的ＩＰ信息的．通过ＣＤＰ可以发现的邻居的信息有：设备的名称，ＩＰ地址，端口，能力，平台，对端的holddown time．在上图的show cdp entry*命令的显示可以看到的信息有：设备名称：Ｌondon；ＩＰ地址：10.1.1.2；平台：cisco2610；能力：Router；端口：s0/１；holdtime：１２５Ｓ．Ｍanchesteter收到这个ＣＤＰ信息的接口为S0/0．
综合一下，这个题目的答案就出来了．
35.A network administrator has configured two switches,named London and Madrid,to use VTP. However,the switches are not sharing VTP messages.Given the command output shown in the graphic,why are these switches not sharing VTP messages?
A.The VTP version is not correctly configured.
B.The VTP operating mode is not correctly configured.
C.The VTP domain name is not correctly configured.
D.VTP pruning mode is disabled.
E.VTP V2mode is disabled.
F.VTP traps generation is disabled.
Answer:C
解释一下：交换机间不能共享VTP的信息，我们就需要检查VTP的状态，首先需要检查的是VTP的域名，只有同一个域中的才可能相互学习，再来检查VTP的模式，必须有一个server 模式才能有VTP学习的过程的，默认的情况下VTP的模式为Server的。然后我们检查图题目给出的信息，可以看到两台交换机的VTP domain是不一致的，所以这个就是问题的所在了。
36.Host1is trying to communicate with Host2.The e0interface on Router C is down.Which of the following are true?(Choose two.)
A.Router C will use ICMP to inform Host1that Host2cannot be reached.
B.Router C will use ICMP to inform Router B that Host2cannot be reached.
C.Router C will use ICMP to inform Host1,Router A,and Router B that Host2cannot be reached.
D.Router C will send a Destination Unreachable message type.
E.Router C will send a Router Selection message type.
F.Router C will send a Source Quench message type.
Answer:AD
解释一下：连Host2的接口E0/0down了，那么最直接的反映就发生在路由器C上，C的路由表中的这个条目就消失了，因此当Host1想要跟Host2建立连接的时候，Router C就发送一个目的网段不可达的消息；如果是使用ping命令，那么Router C就使用ICMP的包文告诉Host 1，Host2是不可打的。
37.Refer to the exhibit.Assuming that the router is configured with the default settings,what type of router interface is this?
A.Ethernet
B.FastEthernet
C.Gigabit Ethernet
D.asynchronous serial
E.synchronous serial
B
解释一下：这个题是需要根据图中提供的信息来判断接口的类型。可以看到接口的MAC地址，表示这个接口肯定不是串行接口，所以可以排除D和E的选项。看带宽BW100000Kbit,表示的是100M的带宽，所以这是个Fast Ethernet接口。
38.On point-to-point networks,OSPF hello packets are addressed to which address?
A.127.0.0.1
B.172.16.0.1
C.192.168.0.5
D.223.0.0.1
E.224.0.0.5
F.254.255.255.255
Answer:E
解释一下：在OSPF中Hello包发向的是224.0.0.5和224.0.0.6这两个地址的。大家在做OSPF实验的时候，用debug命令是可以看到这两个个地址的。
39.While troubleshooting a connectivity problem,a network administrator notices that a port status LED on a Cisco Catalyst series switch is alternating green and amber.Which condition could this indicate?
A.The port is experiencing errors.
B.The port is administratively disabled.
C.The port is blocked by spanning tree.
D.The port has an active link with normal traffic activity.
Answer:A
解释一下：CISCO交换机的端口状态指示灯是闪烁的绿色和浅黄色，表示端口有操作的问题——也许是过量的错误或连接的问题。
40.Refer to the exhibit.The network shown in the exhibit is running the RIPv2routing protocol. The network has converged,and the routers in this network are functioning properly.The FastEthernet0/0interface on R1goes 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 192.168.1.0network are known.
B.Routers R2and R3mark the route as inaccessible and will not accept any further routing updates from R1until their hold-down timers expire.
C.Because of the split-horizon rule,router R2will be prevented from sending erroneous
to R1about connectivity to the192.168.1.0network.
D.When router R2learns from R1that the link to the192.168.1.0network has been lost,R2will respond by sending a route back to R1with an infinite metric to the192.168.1.0network.
E.R1will send LSAs to R2and R3informing them of this change,and then all routers will send periodic updates at an increased rate until the network again converges.
Answer:CD
解释一下：这涉及到RIP关于环路避免的几种机制了。在这里R1的直连的链路发生了变化，立即触发更新（触发更新），发送flash update出去，将这个条目置为possible down，设置最大跳数（路由毒性），R2收到这个flash update后，也回复一个flash update包（毒性逆转），同时将这个条目也置为possible down，设置最大跳数。
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
解释一下：OSPF的进程号只在本地有效。在一台路由器上需要为每个进程维护各自的OSPF 数据库。
43.Refer to the exhibit.The FMJ manufacturing company is concerned about unauthorized access to the Payroll Server.The Accounting1,CEO,Mgr1,and Mgr2workstations should be the only computers 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