As shown in the figure is a typical network of "two places and three centers". Which device in the figure is responsible for branch offices accessing the wide area bearer network?

Question

Exhibit

Options

• AWAN-P
• BBR-CE
• CBR-PE
• DDC-PE

• A
  7% (4)
• B
  15% (9)
• C
  75% (45)
• D
  3% (2)

Explanation

BR-PE (Branch Provider Edge) is the correct answer because, in MPLS-based wide area bearer networks, the Provider Edge (PE) router is the gateway device that terminates customer site connections and injects traffic into the WAN backbone. "BR" designates its role at the branch office side, making BR-PE the specific handoff point where branches attach to the carrier's WAN infrastructure.

Why the distractors are wrong:

• A. WAN-P - P (Provider core) routers are internal backbone transit devices; they forward traffic within the WAN, not at the edge connecting branches.
• B. BR-CE - CE (Customer Edge) is the branch's own router on the customer side; it talks to the PE but is not part of the bearer network itself.
• D. DC-PE - This is the Provider Edge router serving the data center, not branch offices; same device type, wrong location.

Memory tip: Think of it as a two-part label - location + role. BR = Branch (where), PE = Provider Edge (what it does: the "door" into the WAN). The device that connects a branch to the bearer network must be both at the branch (BR) and on the provider's edge (PE). DC-PE is the same concept, just at the data center door instead.

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