300-320 Question #640: Real Exam Question with Answer & Explanation

The correct answer is A: Decrease the routing table of the spokes.. When hub sites advertise summary routes toward spokes: (A) the spokes' routing tables shrink because many specific prefixes are replaced by a single summary route, reducing memory and processing overhead. (E) routing can become more optimal because spokes receive a concise, stabl

Question

Which of the following is correct when creating route summarization from the hub sites (a dual- hub scenario) to the spokes? (Choose three.)

Options

ADecrease the routing table of the spokes.
BDecrease the routing table of the hubs.
CIncrease the routing table of the spokes.
DIncrease the routing table of the spoke.
EProvide more optimal routing.
FMay introduce suboptimal routing.
GOptimize convergence time.

Explanation

When hub sites advertise summary routes toward spokes: (A) the spokes' routing tables shrink because many specific prefixes are replaced by a single summary route, reducing memory and processing overhead. (E) routing can become more optimal because spokes receive a concise, stable view of reachable prefixes rather than constant churn from specific route changes deep in the network. (G) convergence time is optimized because fewer routes mean faster SPF/DUAL calculations, and a single summary route remains stable even when specific routes behind the hub change. Option B is false - the hubs themselves maintain full routing tables, not summaries. Options C and D (increasing spoke routing tables) are the opposite of what summarization achieves. Option F (suboptimal routing) is a concern with summarization in certain scenarios but is not one of the three correct answers identified here.

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