Out of Addresses: Diagnosing a DHCP Pool Exhaustion

N10-007 · 1.4N10-007 · 1.8N10-007 · 5.5 AP Networking · 2.1AP Networking · 2.3
Riverbend Commons is a small community makerspace and lending library. You volunteer as its network admin. Yesterday a teammate, Devon, was tidying up DHCP reservations on the Commons-WiFi scope and trimmed the address range while doing it. Today, visitors in the second-floor study area report a strange pattern: some laptops get online fine, others can't reach anything. The DHCP server is svc-dhcp01 on host rbc-core; the network is 10.20.40.0/24, gateway 10.20.40.1. Find out why only some devices fail, fix the cause, and confirm the fix.
Network Diagnostics
commons-lt07>
svc-dhcp01 — DHCP rbc-core
Scope: Commons-WiFi
Subnet 10.20.40.0 / 255.255.255.0 · IP helper: none
10.20.40.1
10.20.40.5, 9.9.9.9
Address pool utilization—
⚠ Pool exhausted. 18 active devices, but the pool only provides 12 addresses. Devices without a current lease fall back to APIPA (169.254.x.x).

Lab tasks

    Questions

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