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352-001 · Question #438
352-001 Question #438: Real Exam Question with Answer & Explanation
The correct answer is C: policy-based routing. Policy-based routing (PBR) allows a router to forward traffic over a specific interface or next-hop based on defined criteria, including QoS markings, rather than relying solely on the routing table.
Question
Which technology allows QoS-marked traffic to be sent over a dedicated link?
Options
- Atraffic policing
- BMPLS
- Cpolicy-based routing
- DQ-in-Q tunneling
Explanation
Policy-based routing (PBR) allows a router to forward traffic over a specific interface or next-hop based on defined criteria, including QoS markings, rather than relying solely on the routing table.
Common mistakes.
- A. Traffic policing meters and drops or re-marks traffic that exceeds a defined rate, but it does not influence which link the traffic is forwarded over.
- B. MPLS provides label-switched paths and supports traffic engineering, but it does not inherently forward traffic over a specific link based on QoS markings applied at the IP layer without additional TE configuration.
- D. Q-in-Q (IEEE 802.1ad) is a Layer 2 VLAN stacking mechanism used to tunnel customer VLANs across a provider network and has no function in steering QoS-marked traffic to a dedicated link.
Concept tested. Policy-based routing for QoS traffic steering
Reference. https://www.cisco.com/c/en/us/support/docs/ip/ip-routed-protocols/14033-policy-based-routing.html
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