350-501 Architecture Practice Question
In a carrier network using VRF-lite for customer isolation, which issue arises if route-target values are not correctly configured?
⚠ Common exam trap
Cisco often tests the misconception that route-target misconfiguration causes BGP session failures or routing protocol issues, when in fact it only affects route import/export logic, leading to route leakage.
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
✓
Customer routes leak into other VRFs.
In VRF-lite, route-target (RT) values control the import and export of routes between VRFs. If RTs are misconfigured, a VRF may import routes intended for another VRF, causing customer routes to leak across VRFs. This violates isolation because the VRF table incorrectly accepts routes based on mismatched RT import statements.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Customer routes are not installed in the global table.
Why it's wrong here
Routes are installed in the VRF table, not the global table.
- ✗
BGP sessions between PEs flap.
Why it's wrong here
Route-target settings do not affect BGP session stability between PEs.
- ✗
The PE-CE routing protocol fails.
Why it's wrong here
PE-CE routing operates independently of route-target configuration.
- ✓
Customer routes leak into other VRFs.
Why this is correct
Mismatched route-targets can cause unintended import/export, leading to route leakage between VRFs.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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