以下是某公司的网络拓扑图,公司要求全网范围内实现IP地址的动态分配,请根据拓扑图将配置补充完整。
【问题1】(5分)图中的区域(a)的名称是(1),区域(b)的名称是(2),区域(c)的名称是(3),若设备是华为设备,其中区域(C)的默认安全级别是(4)。此防火墙工作模式是(5)。【问题2】(7分)公司的服务器群主要部署了基于WEB的各种应用,尽管在防火墙上设置相应的安全措施,在实际应用中,服务器群总是遭到各种攻击。管理员用网络监测工具发现大量的如下URL:http://www.abc.com/showdetail.asp?id=1 and (select count(*) from sysobjects)>0http://www.abc.com/showdetail.asp?id=1 and user>0…则公司的服务器遭受了(6)攻击,合理的解决方法是(7)。也可以在防火墙的区域(b)与switch5之间部署(8)设备增强Web服务的安全。【问题3】(6分)以下是设备的部分配置,根据题意完成命令填空或者解释。…[Switch1]vlan 2 创建vlan2、3[Switch1-vlan2]quit[Switch1]vlan 3 [Switch1-vlan3]quit[Switch1]vlan 100 [Switch1-vlan100]quit[Switch1] (9) //配置名为net1的地址池[Switch1-ip-pool-net1] (10)[Switch1-ip-pool-net1] gateway-list 192.168.1.254[Switch1-ip-pool-net1] dns-list (11)[Switch1-ip-pool-net1] quit[Switch1][Switch1] ip pool net2[Switch1-ip-pool-net2] network 192.168.2.0 mask 255.255.255.0 [Switch1-ip-pool-net2] gateway-list 192.168.2.254[Switch1-ip-pool-net2] dns-list 114.114.114.114 [Switch1-ip-pool-net2] static-bind ip-address 192.168.2.10 mac-address 0001-1111-2222 [Switch1-ip-pool-net2] quit….[Switch1] (12)[Switch1-Vlanif2] ip address (13)[Switch1-vlanif2] (14) //接口下开启全局DHCP分配功能[Switch1-Vlanif2] quit[Switch1][Switch1] interface vlan 3[Switch1-Vlanif3] ip address 192.168.2.254[Switch1-vlanif3] dhcp select global [Switch1-Vlanif3] quit[Switch1][Switch1] interface vlan 100[Switch1-Vlanif100] ip address 192.168.100.254[Switch1-Vlanif100] quit[Switch1]【问题4】(5分)系统运行一段时间,内网不断有用户报告网络故障,不能访问Internet。管理员在故障机器上,使用(15)命令,可以得到如下信息
则该故障的原因是(16),解决故障的方法是(17)。【问题5】(2分)根据拓扑图,防火墙需要配置默认路由,则正确的命令是(18)和内网的回程路由(19)
正确答案及解析
正确答案
解析
【问题1】(5分)(1)外网 (2)DMZ (3) 内网或者trust (4)85(5)路由模式【问题2】(7分)(6)SQL注入 (2分)(7)1. 严格检查输入变量的类型和格式,进行严格校验 2. 过滤和转义特殊字符 3. 利用预编译机制 (3分)(8)WAF或者web应用防火墙。(2分)【问题3】(6分)(9)ip-pool-net1(10)network 192.168.1.0 mask 255.255.255.0 (11)114.114.114.114(12)Interface vlan 2(13) 192.168.1.254 255.255.255.0(14) Dhcp select global【问题4】(5分)(15)ipconfig/all (1分)(16)存在有非法的dhcp服务器(2分) (17)开启交换机上的dhcp snooping 功能。(2分)【问题5】(2分)(18)ip route-static 0.0.0.0 0.0.0.0 210.112.1.1(19)ip route-static 192.168.0.0 255.255.128.0 192.168.100.254
【解析】
【问题1】防火墙三个基本区域的名字和安全级别是最基础的概念。因为SW1的g0/0/1接口和云端的服务器接口有不同网段的IP地址,因此是路由模式。【问题2】这是典型的SQL注入攻击,通常采用的方式是1. 严格检查输入变量的类型和格式,进行严格校验2. 过滤和转义特殊字符3. 利用预编译机制。针对web应用的安全,简单的方式增加一个WAF设备,直接对web应用进行安全防护。【问题3】略【问题4】略【问题5】略
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