A network administrator notices that devices on the local network are unable to access external websites. After verifying that internet services from the ISP are operational and that internal resources are accessible, the administrator suspects an issue with the network's routing configuration. What configuration error is likely causing the devices to fail connecting to external websites?
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The routing table contains incorrect entries for local subnets.
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The default gateway is not correctly configured on the router.
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ACLs are blocking access to external network addresses.
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Incorrect subnet masks are configured on the devices.
The likeliest issue in this scenario is that the default gateway is not configured or incorrectly configured on the router. The default gateway provides the necessary routing information for forwarding packets destined for external networks and the internet. If it's missing or incorrect, devices can communicate within the local network but fail to find a route for external addresses. Incorrect entries in the routing table typically only affect specific network segments, and incorrect subnets would largely prevent local communications, not just external communications.
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What is a default gateway and why is it important?
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What could happen if the routing table has incorrect entries?