How networks actually work
Routing, NAT, DNS and the rest — the mechanics rather than the analogies, so the next problem is one you can reason about instead of search for.
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DNS Scavenging: Why Stale Records Vanish
Understand DNS scavenging: how aging and scavenging remove stale records, why records disappear, and how to configure it safely.
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How DHCP Works: DORA, Leases, and Failure Modes
Understand DHCP: the DORA exchange, lease lifecycle, renewal timing, and failure modes like exhausted scopes and conflicting servers.