Cisco Certified Network Associate (CCNA) Practice Exam

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Which dynamic routing protocol has auto summarization enabled by default?

OSPF
BGP
EIGRP
RIP

The correct answer is: EIGRP

The correct answer is that EIGRP has auto summarization enabled by default. EIGRP, or Enhanced Interior Gateway Routing Protocol, is designed to simplify routing table entries by automatically summarizing subnets at network boundaries. This feature reduces the amount of routing information that needs to be processed, which optimizes performance, especially in large or complex networks. In contrast, OSPF (Open Shortest Path First) does not use auto summarization, as it is designed to maintain a link-state database that reflects the state of the entire network. BGP (Border Gateway Protocol) also does not support auto summarization by default since it primarily operates at a more complex internet boundary level, dealing with route advertisements between autonomous systems. RIP (Routing Information Protocol), while it does perform route summarization, does not do so automatically unless explicitly configured. Thus, EIGRP’s default behavior of auto summarization sets it apart among these protocols.