Networking / Basic: packet paths and addressing

Networking β€” Basic: packet paths and addressing

Build a layered model of local delivery, prefixes, routes, transports, naming, and automatic configuration.

6 lessons Β· No account required

What you will learn

  • Calculate offline address-plan checks and interpret endpoint roles.
  • Explain what each foundational protocol establishes and leaves unproved.

  1. Follow TCP/IP layers and endpoint identities

    Build a packet-path model that separates local links, routed addresses, transport endpoints, and application identities.

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  2. Calculate IPv4 prefixes and subnet boundaries

    Use binary prefix reasoning and offline address arithmetic to plan subnets without relying on historical address classes.

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  3. Explain Ethernet switching and ARP delivery

    Follow local frames, learned forwarding entries, broadcasts, and IPv4 neighbor resolution without confusing them with routed reachability or authentication.

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  4. Select routes and follow next hops

    Use longest-prefix matching, local-delivery decisions, return paths, and hop limits to explain packet forwarding.

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  5. Compare TCP, UDP, and service endpoints

    Understand ports, streams, datagrams, connection setup, and application-level completion before selecting or diagnosing a transport.

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  6. Connect naming and automatic configuration

    Explain what DNS and DHCP each provide, how caches and leases differ, and why successful bootstrapping does not establish application connectivity.

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