Cisco Certified Network Associate (CCNA) Practice Exam

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Which routing protocol has auto summary enabled by default?

EIGRP
OSPF
BGP
RIPv2

The correct answer is: EIGRP

The correct answer is EIGRP, as Enhanced Interior Gateway Routing Protocol automatically enables summarization at classful boundaries by default. This means that EIGRP will summarize networks if they fall within the same major network segment, which helps to reduce the size of the routing table and minimizes unnecessary routing updates. This feature is particularly beneficial in larger networks as it enhances efficiency and optimizes resource usage. In contrast, OSPF requires manual configuration for summarization, as it uses a classless addressing scheme that allows for more precise control of routing information. BGP, also considered a classless protocol, is designed for inter-domain routing and does not enforce summarization by default, requiring specific configurations for that. RIPv2 does support classless routing and has the ability to perform summarization, but it is not enabled automatically like in EIGRP.