Refer to the exhibit. You must review this single OSPF area, DMVPN network because the company has noticed a few area 0 convergence and stability issues. Also, traffic destined to the data center…

Question

Exhibit

Options

• AMigrate from OSPF to static routes between the hub routers and the spoke routers and deploy IP
• BMigrate from OSPF to EIGRP between the hub routers and the spoke routers
• CModify OSPF cost metrics on all backup links
• DCreate areas between each hub and their spoke routers, to ensure that the hub routers become

• A
  5% (2)
• B
  10% (4)
• C
  83% (34)
• D
  2% (1)

Explanation

Modifying OSPF cost metrics on backup links (C) is the least invasive fix that addresses both problems simultaneously: by raising the cost on backup/indirect links, OSPF will prefer the direct hub-to-spoke path to the data center (fewer hops), and it reduces unnecessary route churn that causes area 0 convergence instability - all without touching the protocol or topology.

Why the distractors are wrong:

• A (Static routes): A full migration to static routing is a major architectural change, not "minimum changes," and loses dynamic failover capability.
• B (EIGRP): Protocol migration requires reconfiguring every device in the network - the opposite of minimum changes.
• D (Multi-area OSPF): Restructuring a flat area 0 network into multiple areas is a significant redesign, not a minimal fix.

Memory tip: When an exam question says "minimum changes" alongside routing issues in OSPF, think metric tuning first - changing costs steers traffic without touching protocols, topology, or device configs beyond a few interface commands. The phrase "minimum changes" is your signal to eliminate any answer involving protocol migration or major redesigns.

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