300-320 Question #388: Real Exam Question with Answer & Explanation

The correct answer is A: Assign STP root with active FHRP device. The STP root bridge and the active FHRP gateway (e.g., HSRP active or VRRP master) should always reside on the same physical switch. If they are on different devices, end-host traffic destined for the default gateway must first traverse STP topology toward the FHRP active device,

Question

When designing layer 2 STP based LAN with FHRP, what design recommendation should be followed?

Options

AAssign STP root with active FHRP device
BAssign native VLAN to lowest number in use
CAvoid configuring router preempt
DAvoid modifying STP & FHRP default timers

Explanation

The STP root bridge and the active FHRP gateway (e.g., HSRP active or VRRP master) should always reside on the same physical switch. If they are on different devices, end-host traffic destined for the default gateway must first traverse STP topology toward the FHRP active device, while STP's own topology is optimized toward a different root-creating suboptimal, asymmetric traffic paths and potentially hairpinning traffic unnecessarily. Aligning the STP root with the active FHRP device ensures that the traffic flows follow the most efficient path through the network. Preempt is generally recommended for FHRP to restore the primary device; native VLANs and timer modifications are separate concerns not directly related to this alignment principle.

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