Multiple choice

What is important to consider while configuring the subinterfaces of a router when implementing inter-VLAN routing?

  1. The physical interface must have an IP address configured.

  2. The subinterface numbers must match the VLAN ID number.

  3. The no shutdown command must be given on each subinterface.

  4. The IP address of each subinterface must be the default gateway address for each VLAN subnet.
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D Correct answer
Explanation

For inter-VLAN routing, each subinterface must have the default gateway IP address for devices in that VLAN to use for routing. The physical interface itself typically does not need an IP address configured. While it's common practice to match subinterface numbers to VLAN IDs, this is not a technical requirement, and the no shutdown command is generally issued on the physical interface, not each subinterface.

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