NSE7 Advanced Networking and SD-WAN Practice Question
What is the purpose of a route map when used with route redistribution on a FortiGate?
⚠ Common exam trap
It's easy for candidates to confuse the route map's role as a filter or modifier with the enabling of redistribution itself, thinking the route map is required to start redistribution, when in fact redistribution is enabled by the 'redistribute' command and the route map is an optional parameter.
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 filter or modify route attributes during redistribution
Route maps are used with route redistribution to filter which routes are redistributed and to modify route attributes (such as metric, tag, or next-hop) as they are injected from one routing protocol into another. Option D is correct because route maps provide granular control over the redistribution process, allowing administrators to match specific routes using prefix lists or ACLs and then set attributes like metric or tag before the routes are redistributed.
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 create a prefix list for BGP
Why it's wrong here
Prefix lists are separate objects referenced by route maps or neighbour filters; a route map does not create one. Route maps match and set attributes on routes during redistribution. They would be correct for controlling which routes are redistributed and modifying their metrics or tags.
- ✗
To define the administrative distance of redistributed routes
Why it's wrong here
Administrative distance is set per protocol under router configuration, not by a route map. Route maps match and set attributes such as metric, tag, or community during redistribution. They would be correct for filtering which routes are redistributed or manipulating their attributes.
- ✗
To enable the redistribution process
Why it's wrong here
Redistribution is enabled by the redistribute command under the routing protocol, not by a route map. A route map is applied to that redistribution to filter and set attributes. It would be correct for selectively permitting routes or tagging them during redistribution.
- ✓
To filter or modify route attributes during redistribution
Why this is correct
A route map applies match conditions and set actions during redistribution, permitting or denying specific routes and altering attributes such as metric, tag, or community. This controls exactly which routes enter the target routing protocol and with what values.
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