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第一套1.计算并填写下表2.如下图所示，某校园网用10Gbps的POS技术与Internet相连，POS接口的帧格式是SDH。路由协议的选择方案是校园网内部采用OSPF协议，校园网与Internet的连接使用静态路由协议。校园网内的路由器R1设为DHCP服务器，可分配的IP地址是221.89.23.192/26，其中221.89.23.200-221.89.23.254地址除外，地址租用时间为5小时30分。问题：请阅读以下R3和R1的部分配置信息，并补充下列空白处的配置命令或参数，按题目要求完成路由器的配置。R3的POS接口、OSPF和缺省路由的配置信息Router-R3#configureterminalRouter-R3(config)#interfacepos4/0Router-R3(config-if)#descriptionToInternetRouter-R3(config-if)#bandwidth10000000Router-R3(config-if)#ipaddress211.68.69.170255.255.255.252Router-R3(config-if)#【6】32Router-R3(config-if)#posframingsdhRouter-R3(config-if)#noipdirected-broadcastRouter-R3(config-if)#posflags1s02Router-R3(config-if)#noshutdownRouter-R3(config-if)#exitRouter-R3(config)#routerospf63Router-R3(config-router)#network【7】area0Router-R3(config-router)#redistributeconnectedmetric-type1subnetsRouter-R3(config-router)#area0range【8】Router-R3(config-router)#exitRouter-R3(config)#iproute0.0.0.00.0.0.0211.68.69.169Router-R3(config)#exitRouter-R3#R1的DHCP的部分配置信息Router-R1#configureterminalRouter-R1(config)#ipdhcp【9】221.89.23.200221.89.23.254Router-R1(config)#ipdhcppoolbuptRouter-R1(dhcp-config)#network221.89.23.192255.255.255.192Router-R1(dhcp-config)#default-router221.89.23.193Router-R1(dhcp-config)#domain-namebupt.edu.cnRouter-R1(dhcp-config)#dns-serveraddress221.89.24.27221.89.24.26Router-R1(dhcp-config)#lease【10】Router-R1(dhcp-config)#exitRouter-R1(config)#exitRouter-R1#3.某客户机使用DHCP获取IP地址等信息，其获取IP地址过程中捕获的4条报文及对第2条报文分析如下所示。请分析其中的信息，补全内容。编号报文摘要1DHCP:Request,Type:DHCPdiscover2DHCP:Reply,Type:DHCP【11】3DHCP:Request,Type:DHCPRequest4DHCP:Reply,Type:DHCPACKDLC:-----DLCHeader-----DLC:Destination=【12】DLC:Source=001122334455DLC:Ethertype=0800(IP)IP:D=【13】,S=192.168.0.1【14】:D=68,S=67DHCP:-----DHCPHeader-----DHCP:Bootrecordtype=2(Reply)DHCP:Hardwareaddresstype=1(10MEthernet)DHCP:Hardwareaddresslength=6bytesDHCP:Hops=0DHCP:Transactionid=6019121FDHCP:Elapsedboottime=0secondsDHCP:Flags=0000DHCP:0=nobroadcastDHCP:Clientself-assignedaddress=[0.0.0.0]DHCP:Clientaddress=[192.168.0.180]DHCP:NextServertouseinbootstrap=[0.0.0.0]DHCP:RelayAgent=[0.0.0.0]DHCP:Clienthardwareaddress=001234567890DHCP:Hostname=DHCP:Bootfilename=DHCP:VendorInformationtag=53825276DHCP:MessageType=2DHCP:Addressrenewelinterval=345600(seconds)DHCP:Addressrebindinginterval=604800(seconds)DHCP:RequestIPAddressleasedtime=691200(seconds)DHCP:SeverIPAddress=【15】DHCP:Subnetmask=255.255.255.0DHCP:Gatewayaddress=[192.168.0.100]DHCP:DomainNameServeraddress=[202.106.0.100]4.下图是校园网某台主机在命令行模式下执行某个命令时用sniffer捕获的数据包。请根据图中信息回答下列问题。（1）该主机上配置的IP地址的网络号长度最多是【16】。（2）图中的①和②删除了部分显示信息，其中①处的信息应该是【17】，②处的信息应该是【18】（3）该主机上配置的域名服务器的IP地址是【19】。（4）该主机上执行的命令是【20】。