300-320 Question #70: Real Exam Question with Answer & Explanation

The correct answer is B: routing protocol instance. A routing protocol instance (B) is what provides control plane separation in VRF (Virtual Routing and Forwarding). Each VRF runs its own independent instance of routing protocols (e.g., OSPF process, EIGRP process, BGP peer), meaning routing updates are exchanged and processed in

Question

Which VRF component ensures control plane separation between the different Layer 3 VPNs?

Options

AFIB
Brouting protocol instance
CRIB
Da subset of the router interfaces

Explanation

A routing protocol instance (B) is what provides control plane separation in VRF (Virtual Routing and Forwarding). Each VRF runs its own independent instance of routing protocols (e.g., OSPF process, EIGRP process, BGP peer), meaning routing updates are exchanged and processed in complete isolation per VRF. The RIB (C) and FIB (A) provide data plane separation (separate routing and forwarding tables per VRF), and a subset of interfaces (D) provides physical separation - but the control plane specifically is kept separate via independent routing protocol instances.

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