【问题4】该市教育城域网建成之后某天，网内某台电脑感染了勒索病毒，网络管理人员应该立即采取（15）（16）（17）等措施。问题（15）（16）（17）备选答案：A．立即删除已感染病毒文件B．断开已感染主机网络连接C．为其他主机升级系统漏洞补丁D．网络层禁止135/137/139/445 端口TCP连接E．更改被感染文件扩展名
（1）,firewall,zone,trust （2）add,interface,GigabitEthernet,1/0/2（3） firewall,zone,untrust （4） add,interface,GigabitEthernet,1/0/1 (5) security-policy (6), 192.168.100.0,24(7) 192.168.200.0,24 , (8) action permit
(9)action permit (10) permit(11) ipsec,proposal,tran1 (12) 202.1.5.1（13）3000
ystem-view[FIREWALL1] interface GigabitEthernet 1/0/2[FIREWALL1-GigabitEthernet1/0/2] ip address 192.168.1.1 24[FIREWALL1-GigabitEthernet1/0/2] quit[FIREWALL1] interface GigabitEthernet 1/0/1[FIREWALL1-GigabitEthernet1/0/1] ip address 202.1.3.1 24[FIREWALL1-GigabitEthernet1/0/1] quit# 配置接口加入相应安全区域。[FIREWALL1] firewall zone trust[FIREWALL1-zone-trust] add interface GigabitEthernet 1/0/2[FIREWALL1-zone-trust] quit[FIREWALL1] firewall zone untrust[FIREWALL1-zone-untrust] add interface GigabitEthernet 1/0/1[FIREWALL1-zone-untrust] quit2. 配置安全策略，允许私网指定网段进行报文交互。# 配置Trust域与Untrust域安全策略，允许封装前和解封后报文能通过[FIREWALL1] security-policy[FIREWALL1-policy-security] rule name 1[FIREWALL1-policy-security-rule-1] source-zone trust[FIREWALL1-policy-security-rule-1] destination-zone untrust[FIREWALL1-policy-security-rule-1] source-address 192.168.100.0 24[FIREWALL1-policy-security-rule-1] destination-address 192.168.200.0 24[FIREWALL1-policy-security-rule-1] action permit[FIREWALL1-policy-security-rule-1] quit…..# 配置Local域与Untrust域安全策略，允许IKE协商报文能正常通过FIREWALL1。[FIREWALL1-policy-security] rule name 3[FIREWALL1-policy-security-rule-3] source-zone local[FIREWALL1-policy-security-rule-3] destination-zone untrust[FIREWALL1-policy-security-rule-3] source-address 202.1.3.1 32[FIREWALL1-policy-security-rule-3] destination-address 202.1.5.1 32[FIREWALL1-policy-security-rule-3] action permit[FIREWALL1-policy-security-rule-3] quit[FIREWALL1-policy-security] rule name 4[FIREWALL1-policy-security-rule-4] source-zone untrust[FIREWALL1-policy-security-rule-4] destination-zone local[FIREWALL1-policy-security-rule-4] source-address 202.1.5.1 32[FIREWALL1-policy-security-rule-4] destination-address 202.1.3.1 32[FIREWALL1-policy-security-rule-4] action permit[FIREWALL1-policy-security-rule-4] quit[FIREWALL1-policy-security] quit3. 配置IPSec隧道。# 配置访问控制列表，定义需要保护数据流。[FIREWALL1] acl 3000[FIREWALL1-acl-adv-3000] rule permit ip source 192.168.100.0 0.0.0.255 destination 192.168.200.00.0.0.255[FIREWALL1-acl-adv-3000] quit# 配置名称为tran1IPSec安全提议。[FIREWALL1] ipsec proposal tran1[FIREWALL1-ipsec-proposal-tran1] encapsulation-mode tunnel[FIREWALL1-ipsec-proposal-tran1] transform esp[FIREWALL1-ipsec-proposal-tran1] esp authentication-algorithm sha2-256[FIREWALL1-ipsec-proposal-tran1] esp encryption-algorithm aes[FIREWALL1-ipsec-proposal-tran1] quit# 配置序号为10IKE安全提议。[FIREWALL1] ike proposal 10[FIREWALL1-ike-proposal-10] authentication-method pre-share[FIREWALL1-ike-proposal-10] authentication-algorithm sha2-256[FIREWALL1-ike-proposal-10] quit# 配置IKE用户信息表。[FIREWALL1] ike user-table 1[FIREWALL1-ike-user-table-1] user id-type ip 202.1.5.1 pre-shared-key Admin@gkys[FIREWALL1-ike-user-table-1] quit# 配置IKE Peer。[FIREWALL1] ike peer b[FIREWALL1-ike-peer-b] ike-proposal 10[FIREWALL1-ike-peer-b] user-table 1[FIREWALL1-ike-peer-b] quit# 配置名称为map_temp序号为1IPSec安全策略模板。[FIREWALL1] ipsec policy-template map_temp 1[FIREWALL1-ipsec-policy-template-map_temp-1] security acl 3000[FIREWALL1-ipsec-policy-template-map_temp-1] proposal tran1[FIREWALL1-ipsec-policy-template-map_temp-1] ike-peer b[FIREWALL1-ipsec-policy-template-map_temp-1] reverse-route enable[FIREWALL1-ipsec-policy-template-map_temp-1] quit# 在IPSec安全策略map1中引用安全策略模板map_temp。[FIREWALL1] ipsec policy map1 10 isakmp template map_temp# 在接口GigabitEthernet 1/0/1上应用安全策略map1。[FIREWALL1] interface GigabitEthernet 1/0/1[FIREWALL1-GigabitEthernet1/0/1] ipsec policy map1[FIREWALL1-GigabitEthernet1/0/1] quit
