哪一组访问控制条目将允许192.168.10.0/24网络上的所有用户访问位于172.17.80.1的Web服务器,但不允许他们使用Telnet?
A. access-list 103 deny tcp host 192.168.10.0 any eq 23access-list 103 permit tcp host192.168.10.1 eq 80
B. access-list103 permit tcp 192.168.10.0 0.0.0.255 any eq 80access-list103 deny tcp 192.168.10.0 0.0.0.255 anyeq 23
C. access-list103 permittcp 192.168.10.0 0.0.0.255 host 172.17.80.1 eq 80access-list103 deny tcp 192.168.10.0 0.0.0.255 anyeq 23
D. access-list103 permit192.168.10.0 0.0.0.255 host 172.17.80.1access-list103 deny tcp 192.168.10.0 0.0.0.255 anyeq telnet
当IPv4主机从DHCP服务器接收到DHCPOFFER消息时,IPv4主机使用哪条消息进行回复?
A. DHCP请求
B. DHCP优惠
C. DHCP发现
DHCP确认
在路由器的接口配置模式下发出以下哪一个命令时,启用了与ISP的链接后,该接口能自动从ISP获取IPv4地址?
A. ip dhcp pool
B. service dhcp
C. ip helper-address
D. ip address dhcp
DHCP客户端的IP地址租约到期时发送哪种消息?
A. DHCP REQUEST 单播消息
B. DHCP DISCOVER 单播消息
C. DHCP REQUEST 广播消息
DHCP DISCOVER 广播消息