300-320 Question #195: Real Exam Question with Answer & Explanation

The correct answer is A: A default route (0.0.0.0 /0) advertised dynamically into the rest of the network. A dynamically advertised default route (0.0.0.0/0) is the simplest possible summary-it collapses all external or unknown destinations into a single advertisement, dramatically reducing routing table size and update traffic (A). OSPF stub areas prevent Type 5 external LSAs from en

Question

Which of the following two are effective and simple means of employing route summarization within the Enterprise Campus network? (Choose two)

Options

AA default route (0.0.0.0 /0) advertised dynamically into the rest of the network
BRoute filtering to manage traffic flows in the network, avoid inappropriate transit traffic through
CUse manual split horizon
DUse a structured hierarchical topology to control the propagation of EIGRP queries
EOpen Shortest Path First (OSPF) stub areas

Explanation

A dynamically advertised default route (0.0.0.0/0) is the simplest possible summary-it collapses all external or unknown destinations into a single advertisement, dramatically reducing routing table size and update traffic (A). OSPF stub areas prevent Type 5 external LSAs from entering the area and instead rely on a default route from the ABR, which is a built-in, simple summarization mechanism requiring minimal configuration (E). Route filtering (B) manages traffic flows but is not summarization. Manual split horizon (C) is a loop-prevention mechanism. Controlling EIGRP query propagation (D) is an EIGRP scalability technique, not route summarization.

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