300-320 Question #485: Real Exam Question with Answer & Explanation

The correct answer is C: Route summarization for scalable routing and addressing design. Route summarization is explicitly recommended in network design to reduce the size of routing tables, decrease routing protocol update overhead, speed up convergence, and support hierarchical addressing. Options A and D describe security-oriented design practices (filtering and d

Question

Which option is a design recommendation for route summarizations?

Options

AFiltered redistribution for the prevention of re-advertising of routes
BRouting protocol stub areas
CRoute summarization for scalable routing and addressing design
DDefensive route filtering to defence against inappropriate routing traffic
ERoute summarization to support greater volumes of transit traffic

Explanation

Route summarization is explicitly recommended in network design to reduce the size of routing tables, decrease routing protocol update overhead, speed up convergence, and support hierarchical addressing. Options A and D describe security-oriented design practices (filtering and defensive redistribution), option B describes OSPF/IS-IS area design, and option E misrepresents summarization - summarization reduces routing overhead, it does not increase transit capacity. Only option C correctly describes route summarization as a tool for building scalable routing and addressing hierarchies.

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