A regional ISP is running MPLS TE. These tunnels are configured manually using paths. Which technology centralizes the traffic engineering decisions to reduce operational complexity?

Question

Options

• ABGP Link State
• BDiffServ-TE
• CTE autobandwidth
• DShared Risk link Group

• A
  10% (4)
• B
  5% (2)
• C
  71% (30)
• D
  14% (6)

Explanation

TE autobandwidth automates the process of adjusting reserved bandwidth on MPLS TE tunnels based on measured actual traffic, eliminating the need for operators to manually tune each tunnel individually. By delegating bandwidth decisions to the protocol itself, it centralizes that logic away from distributed, per-device manual configuration - directly reducing the operational complexity described in the scenario.

Why the distractors are wrong:

• A (BGP Link State): BGP-LS distributes topology information to external controllers (like a PCE or SDN controller), making it a transport mechanism for topology data, not a TE decision-making technology on its own.
• B (DiffServ-TE): Combines QoS traffic classes with MPLS TE to provide per-class bandwidth guarantees - it's about quality of service, not automating TE decisions.
• D (Shared Risk Link Group): Groups links sharing a common failure risk (e.g., same fiber conduit) to achieve path diversity for protection - it's a redundancy/protection concept, not a TE automation tool.

Memory tip: The word "auto" is your anchor - autobandwidth means the network makes bandwidth decisions automatically, replacing manual per-tunnel tuning with centralized, protocol-driven adjustment. If the question mentions reducing manual TE operations, look for the "auto" option.

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