14.2.5 The Default Gateway

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Last updated 3:44 PM on 8/9/26
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4 Terms

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Default gateway

The IP address of the router interface connected to the same local network as the source host.

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How does a host communicate with a remote network?

By encapsulating packets with the MAC address of the router as the destination.

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How does a host determine the MAC address of the router?

By using ARP to resolve the MAC address from the default gateway IPv4 address configured in its TCP/IP settings.

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What happens if no default gateway is configured?

Messages addressed to remote networks cannot be delivered.