When you troubleshoot an IPv4 connectivity issue on a router, which three router configuration checks you must perform? (choose three)
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A. B. C. D. E. F.ACF
When troubleshooting IPv4 connectivity issues on a router, it is important to check the following three router configurations:
A. Verify that the router interface IP address is correct: This is a critical step in the troubleshooting process. Check that the IP address assigned to the router interface is correct and falls within the correct subnet range. You can use the "show ip interface brief" command to display the IP address and status of all interfaces on the router.
C. Verify that the router and the host use the same subnet mask: It is essential to ensure that both the router and the host are using the same subnet mask. If they are not, it can lead to connectivity issues. To check this, you can use the "ipconfig" command on a Windows host or the "ifconfig" command on a Linux host.
E. Verify that a default route is configured: A default route is used by the router to forward packets for which it has no specific route. It is essential to ensure that a default route is configured on the router. You can use the "show ip route" command to view the routing table and verify the presence of a default route.
The other options are not relevant in this case. B. Verify that the DNS is configured correctly, is not related to IPv4 connectivity issues on the router. D. Verify that the router firmware is up-to-date is not related to router configuration checks for IPv4 connectivity. F. Verify that the route appears in the Routing table is already covered under the third option.