350-501 Networking Practice Question
A network engineer needs to ensure that a specific customer's traffic is not adversely affected by other customers' traffic in a shared MPLS core. Which technology should be used?
⚠ Common exam trap
Cisco often tests the distinction between traffic engineering (path optimization) and QoS (rate enforcement), leading candidates to mistakenly choose MPLS TE when the question asks about preventing one customer's traffic from adversely affecting another.
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
✓
QoS policies on PE routers with shaping and policing
QoS policies on PE routers with shaping and policing allow the service provider to enforce traffic contracts per customer, ensuring that one customer's traffic does not consume bandwidth allocated to another. This is achieved by applying ingress policing to limit customer traffic to the Committed Information Rate (CIR) and egress shaping to smooth bursts, preventing congestion in the MPLS core from affecting other customers.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
QoS policies on PE routers with shaping and policing
Why this is correct
QoS allows per-customer traffic controls.
- ✗
iBGP route reflectors
Why it's wrong here
Route reflectors help with BGP scaling, not traffic separation.
- ✗
MPLS Traffic Engineering
Why it's wrong here
TE provides bandwidth reservation but not per-customer isolation as primary goal.
- ✗
802.1Q VLANs
Why it's wrong here
VLANs are for layer 2 separation within a switch.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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