A network engineer is troubleshooting an issue with a computer that is unable to connect to the
Internet. The network engineer analyzes the following output from a command line utility:
Network DestinationNetmask Gateway Interface
192.168.1.0 255.255.255.0 192.168.1.254 eth0
192.168.1.10255.255.255.255 192.168.1.10 eth0
127.0.0.1255.0.0.0 On-Link lo
127.0.0.0255.0.0.0 On-Link lo
255.255.255.255255.255.255.255 102.168.1.10 eth0
Which of the following is the reason for the computer issue, given the above output?
A.
Wrong default gateway netmask
B.
Incorrect default gateway address
C.
Default gateway on the wrong interface
D.
Missing default gateway
Explanation:
Can someone enlighten me why D is the answer here?
There are only two addresses listed here. 192.168.1.0 corresponds to the “network address” and not a “host address”. You can tell this because it ends in .0 and that correlates to the net mask. The other address is 192.168.1.10 which looks like your host’s private IP address assigned to you on this network. There should also be a third address listed that ends in .1 such as 192.168.1.1 which would correspond to the internal address of the default gateway. Basically, the default gateway is the very first “hop” all packets from your host gets sent to on its way to the internet. Without the default gateway explicitly defined, your packets never make it to the router and thus never make it to the network or Internet.
By the way, this looks like the output of a netstat -r command on a Windows machine which shows route tables that the host knows about.
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