CREST Practitioner Security Analyst (CPSA) Practice

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Which of the following is NOT an example of an IGP?

RIP
OSPF
EIGRP
BGP

The correct answer is: BGP

The reason BGP is identified as not being an example of an Interior Gateway Protocol (IGP) is that it is classified as an Exterior Gateway Protocol (EGP). IGPs are used for routing within a single autonomous system, meaning they manage routing inside an organization or network. Examples of IGPs, such as RIP, OSPF, and EIGRP, operate within this framework to determine the best path for data within the internal network. On the other hand, BGP is specifically designed to manage how packets are routed across the internet between different autonomous systems, making it essential for establishing routing between various networks. This distinction in functionality and purpose highlights why BGP does not fit the criteria of an IGP.