Refer to the exhibit. How should you redesign this network running BGP to improve availability of the routers 1A and 1B at the core site?

Question

Exhibit

Options

• ADeploy BGP PIC
• BUse link bundles over multiple slots
• CEnable graceful restart
• DCreate a multichassis system with the two routers

• A
  82% (32)
• B
  3% (1)
• C
  5% (2)
• D
  10% (4)

Explanation

BGP PIC (Prefix Independent Convergence) is the correct answer because it pre-computes and installs backup paths in the forwarding plane before a failure occurs. When the primary path to routers 1A or 1B fails, traffic switches to the backup path in near-zero time - eliminating the lengthy BGP reconvergence delay that normally degrades availability.

Why the distractors are wrong:

• B (Link bundles) addresses physical link redundancy, not BGP control-plane convergence. It doesn't solve the failover timing problem between separate BGP routers.
• C (Graceful restart) helps a restarting router preserve forwarding state during a BGP session reset, but it doesn't pre-install backup paths or speed up failover when a router actually goes down.
• D (Multichassis system) is a valid high-availability architecture, but it's an expensive physical redesign - the question asks how to redesign the BGP network, and PIC achieves fast failover through software/protocol optimization without requiring new hardware.

Memory tip: PIC = Pre-Installed Contingency. BGP PIC does the convergence math ahead of failure, so the router just flips a switch instead of recalculating routes under pressure. If the exam question mentions BGP + fast failover + core router availability, reach for PIC first.

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