CREST Practitioner Security Analyst (CPSA) Practice

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Which port is associated with the Border Gateway Protocol (BGP)?

The correct answer is: 179

The port associated with the Border Gateway Protocol (BGP) is 179. BGP is a standardized exterior gateway protocol used to exchange routing information between different autonomous systems on the Internet. The choice of port 179 for BGP is well-established and is specified in the Internet Assigned Numbers Authority (IANA) service name and port number registry. In the context of networking, port numbers are crucial for establishing communication between different services and applications. The specific allocation of port numbers helps ensure that data sent over the internet reaches its intended destination without interference from other services. For BGP, using port 179 allows routers and networking equipment to listen for BGP messages and properly manage the exchange of routing information across diverse networks. Other ports listed, such as 389, 443, and 80, are used for different networking protocols and services (LDAP, HTTPS, and HTTP respectively) and are not related to BGP. Each of these protocols has its designated port to facilitate specific types of communication, further emphasizing the importance of using the correct port for the intended protocol.