As a network administrator, you have configured a new VLAN for the Marketing department on both SwitchA and SwitchB. Ports Fa0/1-5 on both switches are assigned to this VLAN as access ports. After connecting the switches with an inter-switch link, devices in the Marketing VLAN connected to SwitchA cannot communicate with devices in the same VLAN on SwitchB. What is the most likely cause of this issue?
The inter-switch connection is not configured to carry traffic for the Marketing department.
The ports on SwitchB are administratively shut down.
SwitchB has a different default network configured.
The access ports on SwitchA are incorrectly set to trunk mode.
For devices in the same VLAN on different switches to exchange traffic, the link between the switches must operate as an 802.1Q trunk and include the Marketing VLAN in its allowed list. If that inter-switch port is left in access mode (default VLAN 1) or if the VLAN is pruned from the trunk, frames tagged for the Marketing VLAN will be dropped at the opposite end, so hosts on that VLAN cannot reach each other. The access ports are correctly assigned, so enabling/allowing the VLAN on the trunk resolves the problem.
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Cisco CCNA 200-301
Network Access
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