Cisco
352-001 · Question #723
352-001 Question #723: Real Exam Question with Answer & Explanation
The correct answer is C: when Cisco MPLS TE is required to route different MPLS QoS service classes through different. Cisco MPLS TE is justified in a service provider backbone when differentiated per-class path routing or sub-second Fast Reroute failover is needed.
Question
Which two reasons for implementing Cisco MPLS TE in a service provider MPLS backbone are valid? (Choose two.)
Options
- Awhen Cisco MPLS TE is a prerequisite for implementing RSVP in the backbone
- Bwhen Cisco MPLS TE is required to create backup paths independently from the IGP
- Cwhen Cisco MPLS TE is required to route different MPLS QoS service classes through different
- Dwhen Cisco MPLS TE is required to reroute traffic within less than 1 second in case of a link
- Ewhen Cisco MPLS TE can detect and react to neighbor failures faster than IGPs can
Explanation
Cisco MPLS TE is justified in a service provider backbone when differentiated per-class path routing or sub-second Fast Reroute failover is needed.
Common mistakes.
- A. RSVP is a prerequisite signaling protocol that enables MPLS TE, not an outcome of it; you deploy RSVP because you need MPLS TE, not the reverse.
- B. MPLS TE backup paths are not independent of the IGP topology - they rely on IGP extensions such as OSPF-TE or IS-IS-TE to flood TE link attributes used during path computation.
- E. Faster neighbor failure detection is the function of BFD (Bidirectional Forwarding Detection), not MPLS TE; MPLS TE relies on IGP or RSVP Hello mechanisms for failure awareness.
Concept tested. MPLS TE use cases - QoS routing and Fast Reroute
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