NetworkingBeginner

NOC: Network Foundations

VLANs, OSPF, BGP, and packet-level troubleshooting — the core stack for a junior network engineer.

6 steps~10h
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  1. 1
    Read

    VLAN & trunking runbook

    802.1Q tagging, native VLAN pitfalls, and inter-VLAN routing patterns.

    Open chapter
  2. 2
    Read

    OSPF neighbor diagnosis

    Stuck INIT/EXSTART states, MTU mismatches, and authentication failures.

    Open chapter
  3. 3
    Lab

    Lab — OSPF in Eve-NG/GNS3

    • ›Build a 3-router OSPF triangle with loopback advertisements
    • ›Break adjacency intentionally (MTU, auth, network type) and restore it
    • ›Capture Wireshark during Hello exchange to verify timers
    • ›Document show commands used at each troubleshooting step
  4. 4
    Read

    BGP communities & policy

    Route tagging, local-pref manipulation, and provider-specific communities.

    Open chapter
  5. 5
    Read

    Packet loss diagnosis

    Systematic L1–L4 checks before blaming the application.

    Open chapter
  6. 6
    Self-check

    Self-check — networking

    Answer all questions to validate this step