This 350-601 practice question tests your understanding of 350-601 exam topics. 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.
Which two BGP features are commonly used in a Cisco Data Center spine-leaf fabric to achieve optimal ECMP load balancing? (Choose two.)
BGP add-path
Enables advertisement of multiple paths for load balancing.
BGP confederation
Why wrong: Used for large AS, not for ECMP.
BGP multipath
Allows use of multiple equal-cost paths.
BGP next-hop-self
Why wrong: Changes next-hop, not directly for ECMP.
BGP bestpath tie-break
Why wrong: Used for path selection, not load balancing.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
BGP add-path
BGP multipath enables multiple paths, and add-path allows advertisement of multiple paths to neighbors.
Key principle: OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
BGP add-path
Why this is correct
Enables advertisement of multiple paths for load balancing.
Related concept
OSPF neighbours must agree on key parameters.
BGP confederation
Why it's wrong here
Used for large AS, not for ECMP.
BGP multipath
Why this is correct
Allows use of multiple equal-cost paths.
Related concept
OSPF neighbours must agree on key parameters.
BGP next-hop-self
Why it's wrong here
Changes next-hop, not directly for ECMP.
BGP bestpath tie-break
Why it's wrong here
Used for path selection, not load balancing.
Common exam traps
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
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.
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
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
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 350-601 OSPF questions on adjacency and route selection.
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FAQ
OSPF neighbours must agree on key parameters.
The correct answer is: BGP add-path — BGP multipath enables multiple paths, and add-path allows advertisement of multiple paths to neighbors.
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 350-601 OSPF questions on adjacency and route selection.
OSPF neighbours must agree on key parameters.
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Last reviewed: Jul 4, 2026
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