A network operator working for a telecommunication company with an employee id: 4074:92:707 is planning to implement the Nonstop Forwarding (NSR) feature on the customer's core network. After…

Question

Options

• Aon the CE router
• Bon the ASBR router
• Con the ABR router
• Don the PE router

• A
  2% (1)
• B
  4% (2)
• C
  4% (2)
• D
  89% (41)

Explanation

PE routers are the correct implementation point for NSR because they sit at the boundary between the provider's core network and customer sites, maintaining critical BGP and LDP sessions that must survive a control-plane failover (e.g., route processor switchover) without adjacent routers detecting any disruption.

CE (A) is wrong because CE routers are customer-owned equipment - NSR is a provider-side feature the operator configures on their own infrastructure, not the customer's devices. ASBR (B) is wrong because ASBRs handle inter-autonomous-system routing at network edges, not the standard PE-to-CE handoff point where NSR is needed in a typical MPLS VPN deployment. ABR (C) is wrong because ABRs are OSPF-specific constructs connecting different areas within a single AS - while NSR can apply to IGPs, the primary NSR use case in telecom core networks targets PE routers handling BGP/LDP sessions.

Memory tip: Think "PE protects the Edge" - NSR's job is to hide provider-side failures from customers, so it naturally belongs on the Provider Edge router where that customer boundary lives.

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