Which router device group summarizes for WAN sites on which level?

Question

Options

• ACore
• BDistribution
• CAccess-layer within campus
• DDistribution in data center
• EWAN edge

• A
  3% (1)
• B
  94% (33)
• C
  3% (1)

Explanation

In the Cisco hierarchical network model (Access, Distribution, Core), the Distribution layer is responsible for route summarization. For WAN-connected sites, distribution layer routers aggregate and summarize the more-specific routes from access layer devices before advertising them upward to the core. This keeps the core routing table smaller and more stable, and prevents granular subnet-level changes at the edge from propagating throughout the entire network. The core layer (A) is optimized for high-speed forwarding and should not perform complex policy or summarization. The access layer within campus (C) is where end devices connect and is not responsible for summarization toward the WAN. Distribution in the data center (D) is a different domain context. The WAN edge (E) terminates WAN circuits but distributes routes to/from WAN providers rather than summarizing campus routes.

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