CREST Practitioner Security Analyst (CPSA) Practice

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What type of protocol is BGP classified as?

Path vector protocol
Session protocol
Connectionless protocol
Transport protocol

The correct answer is: Path vector protocol

BGP, or Border Gateway Protocol, is classified as a path vector protocol. This classification is based on how BGP manages routing information among different autonomous systems on the Internet. A path vector protocol operates by maintaining the path information that gets updated as the routing information passes from one router to another. The essential function of BGP is to allow multiple autonomous systems to exchange routing information reliably. It achieves this by using a mechanism where each route advertisement includes the complete list of autonomous systems that the route traverses. This path information is crucial for a router to make informed decisions about the best paths for data transmission, considering factors such as loop prevention and the selection of the most efficient routes. Understanding this classification is significant because it underlines the role BGP plays in the larger context of inter-domain routing and emphasizes the importance of path tracking in managing network traffic across diverse networks.