350-401 Question #315: Real Exam Question with Answer & Explanation

Question

Refer to the exhibit. On which interfaces should VRRP commands be applied to provide first hop redundancy to PC-01 and PC-02?

Options

• AG0/0 and G0/1 on Core
• BG0/0 on Edge-01 and G0/0 on Edge-02
• CG0/1on Edge-01 and G0/1 on Edge-02
• DG0/0 and G0/1 on ASW-01

Explanation

VRRP First Hop Redundancy Explanation

VRRP (Virtual Router Redundancy Protocol) must be configured on the interfaces that face the end devices (PC-01 and PC-02), which are the G0/1 interfaces on both Edge-01 and Edge-02 - these LAN-facing interfaces share the same subnet as the PCs and need a virtual gateway IP so that if one router fails, the other seamlessly takes over. Option A is wrong because Core is an upstream device, not the first-hop gateway for the PCs. Option B is wrong because G0/0 on the Edge routers typically faces the upstream/WAN side, not the PC subnet. Option D is wrong because ASW-01 is a Layer 2 access switch - it doesn't have routed interfaces that participate in VRRP (unless configured as an L3 switch with SVIs, which isn't the case here).

💡 Memory Tip: Think of VRRP as a "handshake between redundant routers at the doorstep of the PCs." Always apply VRRP on the interfaces directly connected to the client subnet - wherever the default gateway IP lives, that's where VRRP commands go.

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