350-501 · Question #477
350-501 Question #477: Real Exam Question with Answer & Explanation
The correct answer is C: Implement LDP sync to prevent packet loss. LDP (Label Distribution Protocol) sync ensures that IGP (OSPF in this case) does not advertise a route into the network until the LDP label bindings for that route are established. This prevents blackholing of traffic during convergence events or label setup. By synchronizing LDP
Question
Refer to the exhibit. OSPF is configured within the core of the service provider network. Connectivity between CE1 and CE2 is provided through the core. An engineer is implementing MPLS to support traffic exchange between customer sites using Layer 3 VPNs. Which task must the engineer perform to secure VPN traffic to meet the SLA of continuous uptime?
Options
- AImplement OSPF stub routing to eliminate routes from being shared over the VPN
- BImplement BGP as the PE-CE routing protocol to support labels for faster data transfer
- CImplement LDP sync to prevent packet loss
- DImplement IS-IS in the core to segregate critical traffic between different areas
Explanation
LDP (Label Distribution Protocol) sync ensures that IGP (OSPF in this case) does not advertise a route into the network until the LDP label bindings for that route are established. This prevents blackholing of traffic during convergence events or label setup. By synchronizing LDP with OSPF, MPLS Layer 3 VPN traffic can flow seamlessly without interruptions, meeting SLA requirements for continuous uptime.
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