The answer is ECMP (Equal Cost Multi-Path). This feature enables a FortiGate to distribute traffic across multiple equal-cost paths to the same destination, leveraging both next-hop routers simultaneously rather than relying on a single route. ECMP is supported by default for dynamic routing protocols like OSPF and BGP, and it uses a hash-based algorithm—typically considering source/destination IP and port—to ensure per-flow load balancing, preventing packet reordering. On the Fortinet NSE 7 Advanced Security NSE7 exam, this question tests your understanding of how FortiGate handles route selection and traffic distribution in multi-path topologies, often appearing in scenarios involving SD-WAN or redundant WAN links. A common trap is confusing ECMP with policy-based routing or session-based load balancing; remember that ECMP applies only when routes have identical administrative distance and metric. Memory tip: think “Equal Cost = Equal Say” — when routes cost the same, ECMP gives each path a voice in carrying traffic.
NSE7 Advanced Networking and SD-WAN Practice Question
This NSE7 practice question tests your understanding of advanced networking and sd-wan. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A FortiGate administrator wants to enable load balancing for equal-cost paths to the same destination. The FortiGate has two equal-cost routes via two different next-hop routers. Which feature should the admin enable to load balance traffic across both paths?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
ECMP (Equal Cost Multi-Path)
Option A is correct. ECMP (Equal Cost Multi-Path) is the feature that allows a router to load balance traffic across multiple equal-cost paths. FortiGate supports ECMP by default for routing protocols like OSPF and BGP.
Key principle: OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
BFD (Bidirectional Forwarding Detection)
Why it's wrong here
BFD is used for fast failure detection, not load balancing.
PBR can direct traffic based on policies but does not load balance across equal-cost routes by itself.
✗
SD-WAN load balancing
Why it's wrong here
SD-WAN load balancing is used for multiple WAN interfaces, not for equal-cost routing paths.
Common exam traps
Common exam trap: OSPF can fail even when IP connectivity looks correct
OSPF neighbour formation depends on matching areas, timers, network type, authentication and passive-interface behaviour. Do not choose an answer only because the devices can ping.
Detailed technical explanation
How to think about this question
OSPF questions usually test the details that control adjacency and route selection. Read the neighbour state, area, router ID and interface configuration before deciding what is wrong.
KKey Concepts to Remember
OSPF neighbours must agree on key parameters.
Router ID selection can affect neighbour relationships and LSDB output.
OSPF cost influences the preferred path.
A route can appear in OSPF information but not become the installed route.
TExam Day Tips
→Check area mismatch first when OSPF adjacency fails.
→Review passive interfaces when a network is advertised but no neighbour forms.
→Use show ip ospf neighbor and show ip route clues carefully.
Key takeaway
OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
Real-world example
How this comes up in practice
A network engineer at a university connects two campus buildings via a fibre link. Both routers run OSPF, but no adjacency forms — even though both routers can ping each other. The engineer finds one router is in area 0 and the other in area 1. OSPF adjacency requires matching area numbers, hello/dead timers, and network type. IP reachability alone is not enough.
What to study next
Got this wrong? Here's your next step.
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related NSE7 OSPF questions on adjacency and route selection.
Advanced Networking and SD-WAN — This question tests Advanced Networking and SD-WAN — OSPF neighbours must agree on key parameters..
What is the correct answer to this question?
The correct answer is: ECMP (Equal Cost Multi-Path) — Option A is correct. ECMP (Equal Cost Multi-Path) is the feature that allows a router to load balance traffic across multiple equal-cost paths. FortiGate supports ECMP by default for routing protocols like OSPF and BGP.
What should I do if I get this NSE7 question wrong?
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related NSE7 OSPF questions on adjacency and route selection.
What is the key concept behind this question?
OSPF neighbours must agree on key parameters.
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