Quiz: Routing

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2 questions

L1 (1 questions)

1. How does a Linux host decide where to send a packet?

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It checks the routing table (ip route show). The most specific matching prefix wins. If no specific route matches, the default gateway (0.0.0.0/0) is used. Routes come from static config, DHCP, or dynamic routing protocols.

L2 (1 questions)

1. Traffic between two subnets is failing. Both hosts have correct IPs. What do you check?

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1. Routing: does each host have a route to the other subnet?
2. Gateway: is the router forwarding (ip_forward=1)?
3. Firewall rules on the router.
4. Return path: the destination must have a route back. Use traceroute to find where packets stop.