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单项选择题

攻击利用攻破的多个系统发送大量请求去集中攻击其他目标，受害设备因为无法处理而拒绝服务，这种被称为

A) Smurf攻击
B) Land攻击
C) DDoS攻击
D) SYN Flooding
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单项选择题下列选项中，( )是对应于A类业务的ATM适配层，它提供的业务特点是实时、恒定比特率和面向连接。

A．AAL1
B．AAL2
C．AAL3
D．AAL4

单项选择题在Cisco路由器上建立一个名为zw246的DHCP地址池，地址池的IP地址是176.115.246.0 24，其中不用于动态分配的地址有176.115.246.2～176.115.246.10，缺省网关为176.115.246.1，域名为tj.edu.cn，域名服务器地址为176.115.129.26，地址租用时间设定为6小时30分钟。下列DHCP地址池的配置，正确的是______。

A) Router(config)#ip dhcp pool zw246
Router(dhcp-config)#ip dhcp excluded-address
176.115.246.2 176.115.246.10
Router(dhcp-config)#network 176.115.246.0
255.255.255.0
Router(dhcp-config)#defauh-router 176.115.246.1
Router(dhcp-config)#domain-name tj.edu.cn
Router(dhcp-config)#dns server address 176.115.129.26
Router(dhcp-config)#lease 0 6 30
B) Router(config)#ip dhcp excluded-address 176.115.246.2-10
Router(config)#ip dhcp pool zw246
Router(dhcp-config)#network 176.115.246.0
255.255.255.0
Router(dhcp-config)#default-router 176.115.246.1
Router(dhcp-config)#domain-name tj.edu.cn
Router(dhcp-config)#dns-server address 176.115.129.26
Router(dhcp-config)#lease 0 6 30
C) Router(config)#ip dhcp excluded-address 176.115.246.2 176.115.246.10
Router(config)#ip dhcp pool zw246
Router(dhcp-eonfig)#network 176.115.246.0
255.255.255.0
Router(dhcp-config)#default-router 176.115.246.1
Router(dhcp-config)#domain-name tj.edu.cn
Router(dhcp-config)#dns-server address 176.115.129.26
Router(dhcp-config)#lease 0 6 30
D) Router(config)#ip dhcp excluded-address 176.115.246.2 176.115.246.10
Router(config)#ip dhcp pool zw246
Router(dhcp-conlig)#network 176.115.246.0
255.255.255.0
Router(dhcp-config)#default-router 176.115.246.1
Router(dhcp-config)#domain-name tj.edu.cn
Router(dhcp-config)#dns-server address 176.115.129.26
Router(dhcp-config)#lease 30 6 0