单项选择题

若服务器系统年停机时间为10分钟,那么系统可用性至少应达到______。

A.99%
B.99.9%
C.99.99%
D.99.999%
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单项选择题

在一台Cisco路由器上执行show access-lists命令显示如下一组信息 Extended IP access list port4444 permit icmp 202.38.97.0,wildcard bits 0.0.0.255 any deny icmp any any deny udp any any eq 1434 deny tcp any any eq 4444 permit ip any any 根据上述信息,正确的access-list配置是______。

A.Router(config)#ip access-list extended port4444 Router(config-ext-nacl)#deny icmp any any Router(config-ext-nael)#deny udp any any eq 1434 Router(config-ext-nacl)#deny tep any any eq 4444 Router(config-ext-nacl)#permit icmp 202.38.97.0 0.0.0.255 any Router(config-ext-nacl)#ermit ip any any
B.Router(config)#access-list port4444-permit icmp 202.38.97.0 0.0.0.255 any Router(config)#access-list port4444 deny icmp any any Router(config)#access-list port4444 deny udp any any eq 1434 Router(config)#access-list port4444 deny tcp any any eq 4444 Router(config)#access-list port4444 permit ip any any
C.Router(config)#ip access-list extended port4444 Router(config-ext-nacl)#permit 202.38.97.0 0.0.0.255 any icmp Router(config-ext-nael)#deny any any icmp Router(config-ext-nacl)#deny any any udp eq 1434 Router(config-ext-nacll#deny any any tcp eq 4444 Router(config-ext-nacl)#permit ip any any
D.Router(config)#ip access-list extended port4444 Router(config-ext-nacl)#permit icmp 202.38.97.0 0.0.0.255 any Router(config-ext-nacl)#deny icmp any any Router(config-ext-nacl)#deny udp any any eq 1434 Router(config-ext-nacl)#deny tcp any any eq 4444 Router(config-ext-nael)#permit ip any any
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