Module 08
DHCP
How a device gets an address without anyone typing one. Play out discover, offer, request and acknowledge, then watch a lease run down and renew.
Start lesson 1
What does a device need before it can talk? · 7 min · free, no account
ApplicationOpen now
What you'll operate
- Discover, offer, request, acknowledge
- Leases and renewal
- Relay agents
- lessons
- 6
- minutes
- 47
Lessons in this module
- 1What does a device need before it can talk?Watch a laptop join a network, then read the settings it was handed.Free, no account7 min
- 2How do you ask for an address without having one?Read the real addressing of each message, and see why the request is shouted to everyone.Plus8 min
- 3What happens when a lease runs down?Work out the two renewal timers, then follow a client whose server has gone quiet.Plus8 min
- 4How does a request reach a server on another network?Follow a relay agent as it carries a broadcast across a router, and see how the server picks the right pool.Plus8 min
- 5What if the address is taken, or nobody answers?Meet the messages that say no, and the address a host gives itself when no server replies.Plus8 min
- 6Who is allowed to hand out addresses?See what one false offer can do, and how a switch that watches DHCP shuts a rogue server out.Plus8 min
Lesson 1 is open to everyone, with no account. The other lessons in this module are part of Plus.