路由表中有4条路由10.0.0.0/24、10.0.1.0/24、10.0.2.0/24、10.0.3.0/24如要进行路由聚合，则正确的聚合后路由是（）

A:10.0.0.0/22 B:10.0.0.0/23 C:10.0.0.0/24 D:10.0.0.0/25

R1、R2是一个自治系统中采用RIP路由协议的两个相邻路由器，R1的路由表如表9-3所示，如果R1收到R2发送的如表9-2所示的(V、D)报文，更新后R1的4个路由表项的距离值从上到下依次为O、7、10、5、3，那么a、b、c、d、e可能的数值依次为______。 表9-3　　R1起始路由表
目的网络 距离 路由 10.0.0.0 0 直接 20.0.0.0 9 R2 30.0.0.0 10 R3 40.0.0.0 5 R4 50.0.0.0 3 R5 表9-2　　R2发送的(V，D)报文
目的网络 距离 10.0.0.0 a 20.0.0.0 b 30.0.0.0 c 40.0.0.0 d 50.0.0.0 e

A:0、6、9、3、2 B:1、6、9、5、4 C:2、7、10、5、3 D:3、8、11、6、4

Cisco路由器执行show access-list命令显示如下一组信息：
Standard IP access list block
deny 10.0.0.0, wildcard bits 0.255.255.255 log
deny 172.16.0.0, wildcard bits 0.15.255.255
permit any
根据上述信息，正确的access-list配置是

A:Router(config) # access-list standard block B:Router(config-std-nac1) # deny 10.0.0.0 255.0.0.0 log C:Router(config-std-nac1) # deny 172.16.0.0 255.240.0.0 D:Router(config-std-nac1) # permit any E:Router(config) # ip access-list standard block F:Router(config-std-nac1) # permit any G:Router(config-std-nac1) # deny 10.0.0.0 0.255.255.255 log H:Router(config-std-nac1) # deny 172.16.0.0 0.15.255.255 I:Router(eonfig) # ip access-list standard block J:Router(config-std-nac1) # deny 10.0.0.0 255.0.0.0 log K:Router(config-std-nac1) # deny 172.16.0.0 255.240.0.0 L:Router(config-std-nac1) # permit any M:Router(config) # ip access-list standard block N:Router(config-std-nac1) # deny 10.0.0.0 0.255.255.255 log

Cisco路由器执行show access-list命令显示如下一组信息
Standard IP access list block
deny 10.0.0.0, wildcardbits 0.255.255.255 log
deny 172.16.0.0, wildcard bits 0.15.255.255
permit any
根据上述信息，正确的access-list配置是（）

A:Router (config) #access-list standard block B:Router (config-std-nacl) #deny 10.0.0.0 255.0.0.0 log C:Router (config-std-nacl) #deny 172.16.0.0 255.240.0.0 D:Router (config-std-nacl) #permit any E:Router (config) #ip access-list standard block F:Router (config-std-nacl) #permit any G:Router (config-std-nacl) #deny 10.0.0.0 0.255.255.255 log H:Router (config-std-nacl) #deny 172.16.0.0 0.15.255.255 I:Router (config) #ip access-list standard block J:Router (config-std-nacl) #deny 10.0.0.0 255.0.0.0 log K:Router (config-std-nacl) #deny 172.16.0.0 255.240.0.0 L:Router (config-std-nacl) #permit any M:Router (config) #ip access-list standard block N:Router (config-std-nacl) #deny 10.0.0.0 0.255.255.255 log

Cisco路由器执行show access-list命令显示如下一组信息
Standard IP access list block
deny 10.0.0.0，wildcard bits 0.255.255.255 log
deny 172.16.0.0，wildeard bits 0.15.255.255
permit any
根据上述信息，正确的access-list配置是______。

A:Router(config)#access-list standard block B:Router(config-std-nael)#deny 10.0.0.0 255.0.0.0 log C:Router(config-std-nacl)#deny 172.16.0.0 255.240.0.0 D:Router(config-std-nacl)#permit any E:Router(config)#ip access-list standard block F:Router(config-std-nael)#permit any G:Router(config-std-nacl)#deny 10.0.0.0 0.255.255.255 log H:Router(config-std-nacl)#deny 172.16.0.0 0.15.255.255 I:Router(config)#ip access-list standard block J:Router(config-std-nacl)#deny 10.0.0.0 255.0.0.0 log K:Router(config-std-nael)#deny 172.16.0.0 255.240.0.0 L:Router(config-std-nacl)#permit any M:Router(config)#ip access-list standard block N:Router(config-std-nacl)#deny 10.0.0.0 0.255.255.255 log

Cisco路由器执行show access-list命令显示如下一组信息
Standard IP access list block
deny 10.0.0.0，wildcard bits 0.255.255.255 log
deny 172.16.0.0，wildcard bits 0.15.255.255
permit any
根据上述信息，正确的access-list配置是______。

A:Router(config)#access-list standard block B:Router(config-std-nae])#deny 10.0.0.0 255.0.0.0 log C:Router(config-std-nac])#deny 172.16.0.0 255.240.0.0 D:Router(config-std-nacl)#permit any E:Router(config)#ip access-list standard block F:Router(config-std-nae])#permit any G:Router(config-std-nael)#deny 10.0.0.0 0.255.255.255 log H:Router(config-std-nac])#deny 172.16.0.0 0.15.255.255 I:Router(config)#ip access-list standard block J:Router(eonfig-std-nae])#deny 10.0.0.0 255.0.0.0 log K:Router(eonfig-std-nae])#deny 172.16.0.0 255.240.0.0 L:Router(config-std-nae])#permit any M:Router(config)#ip access-list standard block N:Router(config-std-nac])#deny 10.0.0.0 0.255.255.255 log

Cisco路由器执行show access-list命令显示如下一组信息
Standard IP access list block
deny 10.0.0.0, wildcardbits 0.255.255.255 log
deny 172.16.0.0, wildcard bits 0.15.255.255
permit any
根据上述信息，正确的access-list配置是（）
　

A:Router (config) #access-list standard block B:Router (config-std-nacl) #deny 10.0.0.0 255.0.0.0 log C:Router (config-std-nacl) #deny 172.16.0.0 255.240.0.0 D:Router (config-std-nacl) #permit any E:Router (config) #ip access-list standard block F:Router (config-std-nacl) #permit any G:Router (config-std-nacl) #deny 10.0.0.0 0.255.255.255 log H:Router (config-std-nacl) #deny 172.16.0.0 0.15.255.255 I:Router (config) #ip access-list standard block J:Router (config-std-nacl) #deny 10.0.0.0 255.0.0.0 log K:Router (config-std-nacl) #deny 172.16.0.0 255.240.0.0 L:Router (config-std-nacl) #permit any M:Router (config) #ip access-list standard block N:Router (config-std-nacl) #deny 10.0.0.0 0.255.255.255 log

Cisco路由器执行show access-list命令显示如下一组信息
　　Standard IP access list block
　　deny 10.0.0.0, wildcardbits 0.255.255.255 log
　　deny 172.16.0.0, wildcard bits 0.15.255.255
　　permit any
　　根据上述信息，正确的access-list配置是（）

A:Router (config) #access-list standard block B:Router (config-std-nacl) #deny 10.0.0.0 255.0.0.0 log C:Router (config-std-nacl) #deny 172.16.0.0 255.240.0.0 D:Router (config-std-nacl) #permit any E:Router (config) #ip access-list standard block F:Router (config-std-nacl) #permit any G:Router (config-std-nacl) #deny 10.0.0.0 0.255.255.255 log H:Router (config-std-nacl) #deny 172.16.0.0 0.15.255.255 I:Router (config) #ip access-list standard block J:Router (config-std-nacl) #deny 10.0.0.0 255.0.0.0 log K:Router (config-std-nacl) #deny 172.16.0.0 255.240.0.0 L:Router (config-std-nacl) #permit any M:Router (config) #ip access-list standard block N:Router (config-std-nacl) #deny 10.0.0.0 0.255.255.255 log