NSE7 Advanced Networking and SD-WAN Practice Question
What is the purpose of using a prefix list in route redistribution?
⚠ Common exam trap
Test-takers frequently confuse prefix lists with route maps or ACLs, thinking prefix lists can modify route attributes or specify next-hops, when in reality prefix lists only perform matching based on prefix and length, while route maps handle attribute manipulation.
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
✓
To match routes based on IP prefix and prefix length
A prefix list is used in route redistribution to match routes based on their IP prefix and prefix length (e.g., 192.168.0.0/16). This allows granular control over which routes are redistributed from one routing protocol to another, such as from OSPF to BGP, by filtering based on the network address and subnet mask.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
To match routes based on IP prefix and prefix length
Why this is correct
Prefix lists match routes by network and subnet mask.
- ✗
To define a list of allowed source IPs for management access
Why it's wrong here
That is access control, not prefix list.
- ✗
To specify the next-hop for a set of routes
Why it's wrong here
Next-hop is set with route maps, not prefix lists.
- ✗
To set BGP community values on matched prefixes
Why it's wrong here
Setting community is done with 'set community' in route maps.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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