If the data frames shown in the figure and the configuration on the interconnection port of the switch, it can be judged that the data frame tagged with VLAN10 can be forwarded normally between the…

Question

Options

• ATrue
• BFalse

• A
  30% (15)
• B
  70% (35)

Explanation

Option B is correct because for VLAN-tagged frames to traverse between switches, the interconnecting port on both switches must be configured as a trunk port (tagged port) - and critically, VLAN10 must be included in the trunk's permitted VLAN list. Based on the figure's configuration, at least one of these conditions is not met (typically the port is set as an access port, or VLAN10 is not permitted on the trunk), causing the tagged frame to be dropped rather than forwarded.

Option A is wrong because simply having a connection between two switches is not enough - the link type and VLAN membership both matter; a misconfigured port silently discards the frame.

Memory tip: Think of a trunk port as a multi-lane highway - each VLAN is a separate lane. If the port is an access port, it's a single-lane road that rejects tagged (multi-lane) traffic entirely. Always verify: (1) both sides are trunk, and (2) the VLAN is explicitly allowed on the trunk. If either check fails, forwarding fails.

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