Explain steps for DHCP failure troubleshooting.

[bob]

You check the client machine right away when things go wrong. I always start there because it shows quick clues. Your ipconfig command reveals if an address got assigned or not. But sometimes the lease expired without warning. And you see errors popping up in the event logs too. Perhaps the adapter reset itself oddly during a reboot. Now you test basic connectivity with simple pings to the gateway. Or maybe the cable got loose from all the moving around desks. Then release and renew helps in many cases like this. You notice patterns after doing it a few times on different machines.
I look at the server next because that often hides the real problem. Your service might have stopped running after an update hit it. But check the scope settings for exhaustion or wrong ranges. And you verify the relay if it crosses subnets oddly. Perhaps a misconfigured option blocks responses entirely. Now scan for duplicate addresses that conflict with static setups. Then review active leases to spot any stuck ones. Or restart the service gently to refresh everything without full downtime. You catch these issues faster with regular monitoring habits.
Network links cause trouble when cables or switches fail unexpectedly. I test the physical connections first in those spots. Your switch ports might drop packets during heavy traffic loads. But trace routes help isolate where the break happens. And you swap cables to rule out hardware faults quick. Perhaps the firewall blocks udp ports without you knowing. Now examine router configs for forwarding rules gone bad. Then check if other services on the same box interfere. Or reboot the relay device if it sits between segments. You gain experience spotting these after handling a bunch of calls.
Advanced problems show up in logs or with scope conflicts. I dig through server logs for denial messages or errors. Your reservations could overlap causing assignment fights. But clear old leases manually when they pile up. And you adjust the pool size if usage grew recently. Perhaps a new device pulls multiple addresses by mistake. Now test from another client to compare behaviors. Then verify authorization in the domain if needed. Or use packet captures sparingly for deeper looks. You avoid overcomplicating by sticking to basics first.
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