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6.3.2. Addressing Issues
| Issue | Symptom | Solution |
|---|---|---|
| Duplicate IP | Intermittent connectivity | Find and remove duplicate |
| DHCP exhaustion | New devices can't get addresses | Expand scope, reduce lease time |
| Incorrect gateway | Reach local, not remote | Fix gateway configuration |
| Wrong subnet mask | Partial connectivity | Correct the mask |
| APIPA address | Can't reach DHCP | Check DHCP server, relay, connectivity |
⚠️ Exam Pattern: Duplicate IPs cause intermittent problems because traffic alternates between both devices as ARP tables update. If symptoms come and go unpredictably, check for duplicates.
Written byAlvin Varughese
Founder•15 professional certifications