NSE7 Advanced Networking and SD-WAN Practice Question
Which routing protocol is commonly used in SD-WAN deployments to exchange routes between FortiGate and the provider edge router in an MPLS network?
⚠ Common exam trap
Watch out — candidates often default to OSPF as a 'common' routing protocol in enterprise networks, failing to recognize that MPLS VPNs specifically require BGP for inter-domain route exchange and SD-WAN overlay integration.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
BGP
BGP is the correct answer because it is the standard exterior gateway protocol used in MPLS Layer 3 VPNs to exchange customer routes between a FortiGate (CE router) and the provider edge (PE) router. BGP supports advanced features like route filtering, load balancing, and traffic engineering, which are essential for SD-WAN overlay integration with MPLS underlay networks.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
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RIP
Why it's wrong here
RIP is not commonly used in SD-WAN due to slow convergence.
- ✓
BGP
Why this is correct
BGP is the preferred protocol for exchanging routes with MPLS provider edge routers due to its scalability and policy control.
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IS-IS
Why it's wrong here
IS-IS is typically used in ISP backbones, not commonly in SD-WAN customer edge routers.
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OSPF
Why it's wrong here
OSPF can be used, but BGP is more common for MPLS SD-WAN because it offers better control and scalability.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This NSE7 practice question is part of Courseiva's free Fortinet certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the NSE7 exam.