OSPF only advertises changed routes to neighbors.

Question

Options

• ATRUE
• BFALSE

• A
  83% (34)
• B
  17% (7)

Explanation

A is correct because OSPF is a link-state protocol that uses triggered updates - when a topology change occurs, only the changed Link State Advertisements (LSAs) are flooded to neighbors, rather than sending the entire routing table periodically. This is a key distinction from distance vector protocols like RIP, which broadcast the full routing table on a fixed interval regardless of changes.

Option B is wrong because the statement accurately describes OSPF's update behavior. Saying FALSE would imply OSPF sends full routing tables periodically, which is characteristic of RIP (every 30 seconds), not OSPF.

Memory tip: Think of OSPF as "efficient by exception" - it only speaks up when something changes. RIP, by contrast, constantly repeats itself on a timer whether anything changed or not. If you remember "OSPF = change-triggered, RIP = time-triggered," this distinction will stick.

Note for deeper study: Strictly speaking, OSPF does exchange a full link-state database during initial adjacency formation, and LSAs are periodically refreshed every 30 minutes. The "only changed routes" framing applies to steady-state operation - which is what most exam questions at the CCNA level are testing.

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