某单位网络拓扑结构、设备接口及IP地址的配置如下图所示，R1和R2上运行RIPv2路由协议。
在配置完成后，路由器R1、R2的路由表如下图所示。
R1的路由表：
C 1.1.1.0 is directly connected,FastEthernet0/1
C 12.1.1.0 is directly connected,FastEthernet0/0
R2的路由表：
R 1.0.0.0/8[120/1]via 12.1.1.1,00:00:06, FastEthernet0/0
C 2.2.2.0 is directly connected,FastEthernet0/1
C 12.1.1.0 is directly connected,FastEthernet0/0
R1路由表未达到收敛状态的原因可能是（ ），如果此时在PCI上ping主机PC2，返回的消息是（ ）。
问题1选项
A.R1的接口F0/0未打开
B.R2的接口F0/0未打开
C.R1未运行RIPv2路由协议
D.R2未宣告局域网路由
问题2选项
A.Request timed out
B.Reply from 1.1.1.1:Destination host unreachable
C.Reply from 1.1.1.1:bytes=32 time=0ms TTL=255
D.Reply from 2.2.2.2:bytes=32 time=0ms TTL=126
正确答案及解析
正确答案
解析
答案： D、B
R1的路由表没有学习到PC2所在网络，如果此时PC1去PING PC2，返回的消息主机不可达。
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