Troubleshooting VLAN access: A new host is connected to a switch but cannot log into the server on the same switch. What is the most likely issue?

Introduction / Context:
Hosts connected to the same switch must belong to the same VLAN to communicate without routing. Misconfigured VLAN assignment is a common cause of access issues.

Given Data / Assumptions:

• New host connected to switch port.
• Cannot communicate with server on same switch.

Concept / Approach:
Switches segment traffic into VLANs. If the host port and server port are not in the same VLAN, frames will not be forwarded between them without an L3 device.

Step-by-Step Solution:

Verification / Alternative check:
Run show vlan brief to confirm port VLAN assignment.

Why Other Options Are Wrong:

• A: Router not required if both devices are in same VLAN.
• B: VTP propagates VLAN info but not per-host config.
• C: Invalid MAC would prevent switch registration, rare scenario.
• E: Server NIC issue would affect all connections, not just this host.

Common Pitfalls:
Assuming VTP handles host-specific access; overlooking VLAN port assignment checks.

Final Answer:
The switch port is not configured to the correct VLAN membership.