在路由器的特权模式下,ping某个IP地址,若超时仍没收到对方响应报文,则输出()。
第1题:
某网络中PC1无法访问域名为www.aaa.cn的网站,而其他主机访问正常,在PC1上执行ping命令时有如下所示的信息: C:>ping www.aaa.cn Pinging www.aaa.cn[202.117.112.36] with 32 bytes of data: Reply from 202.117.112.36: Destination net unreachable. Reply from 202.117.112.36:Destination net unreachable. Reply from 202.117.1 12.36:Destination net unreachable. Reply from 202.1 17.112.36: Destination net unreachable. Ping statistics for 202.117.112.36: Packets: Sent=4,Received=4,Lost=0(0% loss), Approximate round trip tunes in milli-seconds: Minimum=0ms, Maximum=0ms, Average=0ms 造成该现象可能的原因是( )。
A.DNS服务器故障B.PC1上TCP/lP协议故障C.遭受了ACL拦截D.PC1上hternet属性参数设置错误
第2题:
A.向目标主机发送UDP Echo Request数据包,等待对方回应UDP Echo Reply数据包
B.向目标主机发送ICMP Echo Request数据包,等待对方回应ICMP Echo Reply数据包
C.向目标主机发送UDP Echo Reply数据包,等待对方回应ICMP Echo Request数据包
D.向目标主机发送ICMP Echo Reply数据包,等待对方回应ICMP Echo Request数据包
第3题:
设某单位路由器建立了以下的路由表,若收到分组的目的IP地址为128.96.37.151,则转发的口是(57),若收到分组的目的IP是128.96.35.151,则转发的端口是(58),若该路由器是该单位的与Internet接人路由器,则该单位分得的IP地址是(59)。在一个网络中子网数目划分增多时,可供分配给主机的正常IP地址总数目会(60)。当我们将主机地址设置为192.1680.1.2时,则主机访问Internet时(61)。
A.E1
B.R2
C.R3
D.R4
第4题:
第5题:
第6题:
A.Timeout
B.Unreachable
C.Non-existent address
D.Relay from 202.38.160.2…….
第7题:
A.错误
B.正确
第8题:
某单位网络结构如图1-1所示,网络中所有路由器均使用RIP协议。
图1-1
在网络部署完成后进行如下测试:
1.在主机host101上对Router2的F0/0口及网络1的host1进行了连通性测试,结果如图1-2和图1-3所示。
host101>ping 192.168.0.1
Pinging 192.168.0.1 with 32 bytes of data:
Reply from 192.168.0.1: bytes=32 time=1ms TTL=64
Reply from 192.168.0.1: bytes=32 time=1ms TTL=64
Reply from 192.168.0.1: bytes=32 time=1ms TTL=64
Reply from 192.168.0.1: bytes=32 time=1ms TTL=64
Ping statistics for 192.168.0.1:
Packets: Sent = 4,Received = 4,Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 1ms,Maximum = 1ms,Average = 1ms
图1-2
host101>ping 192.168.0.2
Pinging 192.168.0.2 with 32 bytes of data:
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Ping statistics for 192.168.0.2:
Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),
图1-3
2.在主机host3上对网络1进行了连通性测试,结果如图1-4所示。
host13>ping 192.168.0.2
Pinging 192.168.0.1 with 32 bytes of data:
Reply from 192.168.0.1: bytes=32 time=1ms TTL=64
Reply from 192.168.0.1: bytes=32 time=1ms TTL=64
Reply from 192.168.0.1: bytes=32 time=1ms TTL=64
Reply from 192.168.0.1: bytes=32 time=1ms TTL=64
Ping statistics for 192.168.0.1:
Packets: Sent = 4,Received = 4,Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 1ms,Maximum = 1ms,Average = 1ms
图1-4
3.查看路由器Router3的路由表,结果如图1-5所示。
Router3>show ip route
R 192.168.0.0/24 [120/1] via 202.117.112.1, 00:00:24,Serial2/0
C 192.168.1.0/24 is directly connected,FastEthemet0/0
R 192.168.2.0/24 [120/1] via 202.117.114.1,00:00:01,Serial3/0
202.117.112.0/30 is subnetted,1 subnets
C 202.117.112.0 is directly connected,Serial2/0
R 202.117.113.0/30 [120/1] via 202.117.112.1,00:00:24,Serial2/0
[120/1] via 202.117.114.1,00:00:01,Serial3/0
202.117.114.0/30 is subnetted,1 subnets
C 202.117.114.0 is directly connected,Serial3/0
图1-5
【问题1】(6分)
请填写hostl的Internet协议属性参数。
IP地址: (1)
子网掩码: (2)
默认网关: (3)
图1-2和图1-3连通性测试很快得知Router2的F0/0接口和host1的IP地址分别是192.168.0.1和192.168.0.2。图1-5中Router3路由表中学习到192.168.0.0/24的路由,可见对于host1而言,其网卡参数为中,IP地址为192.168.0.2,子网掩码为255.255.255.0,其网关为Router2的F0/0接口地址即192.168.0.1。
【问题1】(6分,每空2分)
(1)192.168.0.2
(2)255.255.255.0
(3)192.168.0.1
第9题:
第10题: