When you troubleshoot an IPv4 connectivity issue on a router, which three router configuration checks you must perform?
A. Verify that the router interface IP address IP address is correct.
B. Verify that the DNS is configured correctly.
C. Verify that the router and the host use the same subnet mask.
D. Verify that the router firmware is up-to-date.
E. Verify that a default route is configured.
F. Verify that the route appears in the Routing table
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a, c and f
CORRRECT ANSWER a,c and f not abf
Why c) ?
Bahri Sami, the router and the host can be in different networks hence have different subnet masks, right?
Regards
Joca, the correct answer is a,c and f. The reason why it is c instead of b is because DNS is not necessary to test “IP” connectivity issues on a ROUTER. It would, however, be useful to test name resolution of a DNS server.
Additionally, hosts must be on the same subnet (hence have the same subnet mask) of a router’s interface. The router’s interfaces (and IP’s) are typically the default gateways for its hosts. How could hosts connect to its gateway if it doesn’t have the same subnet mask? With a different subnet mask it would place the hosts on a different subnet and thus would be unable to communicate with its gateway. C, therefore is the correct answer.
The question doesn’t specify that the host is in a subnet that is directly connected to the router we are troubleshooting. The host could be a few router hops away. Joca’s question is legit.