SubnetLayerProtocols

DHCP — end of module

What this checks. That you can say what a lease actually delivers, and recognise a configuration fault by its effects further up. You need 5 of 6 to pass, and every option is explained afterwards — including the ones you did not pick.

  1. 1/6Someone says 'DHCP is always four messages'. When is that not true?

    Say why an answer is wrong

  2. 2/6A laptop has an address and can reach the printer, but nothing off the LAN works. The DHCP ACK's Router option reads 10.0.1.9, and the router on the segment is 10.0.1.1. What is the fault?

    Diagnose a failure

  3. 3/6A DISCOVER is broadcast from source address 0.0.0.0. Which machine chooses which offer is accepted?

    Identify the responsible endpoint

  4. 4/6Which field in the ACK carries the address being leased to the client?

    Match a field to its purpose

  5. 5/6Someone says 'once the ACK arrives, the client is bound and the exchange is finished'. When is that not true?

    Say why an answer is wrong

  6. 6/6A new VLAN is created. No machine on it can get an address, while three other VLANs served by the same DHCP server are fine. Where is the fault?

    Diagnose a failure

When every module makes sense on its own, the capstone asks the questions that need two protocols at once.