Continue your lesson
Follow traffic from the endpoint through each device, protocol, and service in the path.
Block 1 of 2Understand Incorrect VLAN assignment
Current · 15 min
Understand Incorrect VLAN assignment
Optional concept notes
Incorrect VLAN assignment
Places an endpoint in the wrong Layer 2 broadcast domain.
Complete one provider lesson, then answer four related questions. That is enough for today; more practice is optional.
Your lesson stays open here while the provider opens in another tab. Choose one source; the notes above are optional.
Block 2 of 2Compare Incorrect default gateway · DHCP scope exhaustion · Duplicate IP address
10 min
Compare Incorrect default gateway · DHCP scope exhaustion · Duplicate IP address
Optional concept notes
Incorrect default gateway
Prevents a host from reaching destinations outside its local subnet.
DHCP scope exhaustion
Prevents new clients from receiving leases when no addresses remain.
Duplicate IP address
Causes intermittent reachability when multiple hosts claim one address.
Complete one provider lesson, then answer four related questions. That is enough for today; more practice is optional.
Your lesson stays open here while the provider opens in another tab. Choose one source; the notes above are optional.
Practice the reasoning here
Sketch a small network or packet path. Predict the expected state, introduce one fault, and identify the observation that isolates it.
- State the expected result before changing or testing anything.
- Name the observation, command, log, or report that would confirm it.
- Explain why the closest alternative does not fit the same requirement.
Check the whole objective
This unlocks objective 5.3 for recall. The latest checkpoint needs 70% or higher; a lower result puts the lesson back near the front of your timeline.